==================================================================
BUG: KASAN: slab-out-of-bounds in __cpa_addr arch/x86/mm/pat/set_memory.c:309 [inline]
BUG: KASAN: slab-out-of-bounds in __cpa_addr+0x1d3/0x220 arch/x86/mm/pat/set_memory.c:306
Read of size 8 at addr ffff888055911408 by task syz.7.2909/18825

CPU: 0 UID: 0 PID: 18825 Comm: syz.7.2909 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
 print_address_description mm/kasan/report.c:378 [inline]
 print_report+0xcd/0x630 mm/kasan/report.c:482
 kasan_report+0xe0/0x110 mm/kasan/report.c:595
 __cpa_addr arch/x86/mm/pat/set_memory.c:309 [inline]
 __cpa_addr+0x1d3/0x220 arch/x86/mm/pat/set_memory.c:306
 cpa_flush+0x28b/0x8a0 arch/x86/mm/pat/set_memory.c:449
 change_page_attr_set_clr+0x34e/0x4a0 arch/x86/mm/pat/set_memory.c:2115
 cpa_set_pages_array arch/x86/mm/pat/set_memory.c:2137 [inline]
 _set_pages_array+0x1ab/0x2c0 arch/x86/mm/pat/set_memory.c:2521
 drm_gem_shmem_get_pages_locked+0x384/0x490 drivers/gpu/drm/drm_gem_shmem_helper.c:214
 drm_gem_shmem_pin_locked+0x223/0x470 drivers/gpu/drm/drm_gem_shmem_helper.c:261
 drm_gem_map_attach+0x184/0x270 drivers/gpu/drm/drm_prime.c:620
 dma_buf_dynamic_attach+0x1f3/0x530 drivers/dma-buf/dma-buf.c:974
 drm_gem_shmem_prime_import_no_map drivers/gpu/drm/drm_gem_shmem_helper.c:835 [inline]
 drm_gem_shmem_prime_import_no_map+0x67/0x3c0 drivers/gpu/drm/drm_gem_shmem_helper.c:816
 drm_gem_prime_fd_to_handle+0x1a9/0x5f0 drivers/gpu/drm/drm_prime.c:313
 drm_prime_fd_to_handle_ioctl+0xd6/0x110 drivers/gpu/drm/drm_prime.c:371
 drm_ioctl_kernel+0x1f4/0x3e0 drivers/gpu/drm/drm_ioctl.c:797
 drm_ioctl+0x5c9/0xc30 drivers/gpu/drm/drm_ioctl.c:894
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:597 [inline]
 __se_sys_ioctl fs/ioctl.c:583 [inline]
 __x64_sys_ioctl+0x18e/0x210 fs/ioctl.c:583
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0xfa0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fe7db38eec9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fe7dc172038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fe7db5e6180 RCX: 00007fe7db38eec9
RDX: 0000200000000300 RSI: 00000000c00c642e RDI: 0000000000000008
RBP: 00007fe7db411f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fe7db5e6218 R14: 00007fe7db5e6180 R15: 00007ffc21f30068
 </TASK>

Allocated by task 18825:
 kasan_save_stack+0x33/0x60 mm/kasan/common.c:56
 kasan_save_track+0x14/0x30 mm/kasan/common.c:77
 poison_kmalloc_redzone mm/kasan/common.c:400 [inline]
 __kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:417
 kasan_kmalloc include/linux/kasan.h:262 [inline]
 __do_kmalloc_node mm/slub.c:5627 [inline]
 __kvmalloc_node_noprof+0x3a3/0x9c0 mm/slub.c:7081
 kvmalloc_array_node_noprof include/linux/slab.h:1122 [inline]
 drm_gem_get_pages+0x144/0xa10 drivers/gpu/drm/drm_gem.c:647
 drm_gem_shmem_get_pages_locked+0x1e6/0x490 drivers/gpu/drm/drm_gem_shmem_helper.c:200
 drm_gem_shmem_pin_locked+0x223/0x470 drivers/gpu/drm/drm_gem_shmem_helper.c:261
 drm_gem_map_attach+0x184/0x270 drivers/gpu/drm/drm_prime.c:620
 dma_buf_dynamic_attach+0x1f3/0x530 drivers/dma-buf/dma-buf.c:974
 drm_gem_shmem_prime_import_no_map drivers/gpu/drm/drm_gem_shmem_helper.c:835 [inline]
 drm_gem_shmem_prime_import_no_map+0x67/0x3c0 drivers/gpu/drm/drm_gem_shmem_helper.c:816
 drm_gem_prime_fd_to_handle+0x1a9/0x5f0 drivers/gpu/drm/drm_prime.c:313
 drm_prime_fd_to_handle_ioctl+0xd6/0x110 drivers/gpu/drm/drm_prime.c:371
 drm_ioctl_kernel+0x1f4/0x3e0 drivers/gpu/drm/drm_ioctl.c:797
 drm_ioctl+0x5c9/0xc30 drivers/gpu/drm/drm_ioctl.c:894
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:597 [inline]
 __se_sys_ioctl fs/ioctl.c:583 [inline]
 __x64_sys_ioctl+0x18e/0x210 fs/ioctl.c:583
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0xfa0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

The buggy address belongs to the object at ffff888055911000
 which belongs to the cache kmalloc-2k of size 2048
The buggy address is located 0 bytes to the right of
 allocated 1032-byte region [ffff888055911000, ffff888055911408)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x55910
head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000040 ffff88813ffa7000 dead000000000100 dead000000000122
raw: 0000000000000000 0000000080080008 00000000f5000000 0000000000000000
head: 00fff00000000040 ffff88813ffa7000 dead000000000100 dead000000000122
head: 0000000000000000 0000000080080008 00000000f5000000 0000000000000000
head: 00fff00000000003 ffffea0001564401 00000000ffffffff 00000000ffffffff
head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000008
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 5831, tgid 5831 (syz-executor), ts 114960089299, free_ts 36419860542
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x1c0/0x230 mm/page_alloc.c:1850
 prep_new_page mm/page_alloc.c:1858 [inline]
 get_page_from_freelist+0x10a3/0x3a30 mm/page_alloc.c:3884
 __alloc_frozen_pages_noprof+0x25f/0x2470 mm/page_alloc.c:5183
 alloc_pages_mpol+0x1fb/0x550 mm/mempolicy.c:2416
 alloc_slab_page mm/slub.c:3039 [inline]
 allocate_slab mm/slub.c:3212 [inline]
 new_slab+0x24a/0x360 mm/slub.c:3266
 ___slab_alloc+0xdc4/0x1ae0 mm/slub.c:4636
 __slab_alloc.constprop.0+0x63/0x110 mm/slub.c:4755
 __slab_alloc_node mm/slub.c:4831 [inline]
 slab_alloc_node mm/slub.c:5253 [inline]
 __do_kmalloc_node mm/slub.c:5626 [inline]
 __kmalloc_node_noprof+0x4dd/0x8a0 mm/slub.c:5633
 kmalloc_node_noprof include/linux/slab.h:987 [inline]
 qdisc_alloc+0xbb/0xc50 net/sched/sch_generic.c:950
 qdisc_create_dflt+0x94/0x490 net/sched/sch_generic.c:1012
 attach_one_default_qdisc net/sched/sch_generic.c:1178 [inline]
 netdev_for_each_tx_queue include/linux/netdevice.h:2664 [inline]
 attach_default_qdiscs net/sched/sch_generic.c:1196 [inline]
 dev_activate+0x63f/0x12d0 net/sched/sch_generic.c:1255
 __dev_open+0x432/0x7c0 net/core/dev.c:1691
 __dev_change_flags+0x55d/0x720 net/core/dev.c:9637
 netif_change_flags+0x8d/0x160 net/core/dev.c:9700
 do_setlink.constprop.0+0xb53/0x4380 net/core/rtnetlink.c:3151
 rtnl_changelink net/core/rtnetlink.c:3769 [inline]
 __rtnl_newlink net/core/rtnetlink.c:3928 [inline]
 rtnl_newlink+0x1446/0x2000 net/core/rtnetlink.c:4065
page last free pid 1 tgid 1 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 free_pages_prepare mm/page_alloc.c:1394 [inline]
 __free_frozen_pages+0x7df/0x1160 mm/page_alloc.c:2906
 __free_pages mm/page_alloc.c:5302 [inline]
 free_contig_range+0x183/0x4b0 mm/page_alloc.c:7146
 destroy_args+0xb69/0x12e0 mm/debug_vm_pgtable.c:958
 debug_vm_pgtable+0x1a32/0x3640 mm/debug_vm_pgtable.c:1345
 do_one_initcall+0x123/0x6e0 init/main.c:1283
 do_initcall_level init/main.c:1345 [inline]
 do_initcalls init/main.c:1361 [inline]
 do_basic_setup init/main.c:1380 [inline]
 kernel_init_freeable+0x5c8/0x920 init/main.c:1593
 kernel_init+0x1c/0x2b0 init/main.c:1483
 ret_from_fork+0x675/0x7d0 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

Memory state around the buggy address:
 ffff888055911300: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff888055911380: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff888055911400: 00 fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
                      ^
 ffff888055911480: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff888055911500: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================
==================================================================
BUG: KASAN: slab-out-of-bounds in __cpa_addr arch/x86/mm/pat/set_memory.c:309 [inline]
BUG: KASAN: slab-out-of-bounds in __cpa_addr+0x1d3/0x220 arch/x86/mm/pat/set_memory.c:306
Read of size 8 at addr ffff888055911408 by task syz.7.2909/18825

CPU: 0 UID: 0 PID: 18825 Comm: syz.7.2909 Tainted: G    B               syzkaller #0 PREEMPT(full) 
Tainted: [B]=BAD_PAGE
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
 print_address_description mm/kasan/report.c:378 [inline]
 print_report+0xcd/0x630 mm/kasan/report.c:482
 kasan_report+0xe0/0x110 mm/kasan/report.c:595
 __cpa_addr arch/x86/mm/pat/set_memory.c:309 [inline]
 __cpa_addr+0x1d3/0x220 arch/x86/mm/pat/set_memory.c:306
 cpa_flush+0x28b/0x8a0 arch/x86/mm/pat/set_memory.c:449
 change_page_attr_set_clr+0x34e/0x4a0 arch/x86/mm/pat/set_memory.c:2115
 _set_pages_array+0x20a/0x2c0 arch/x86/mm/pat/set_memory.c:2524
 drm_gem_shmem_get_pages_locked+0x384/0x490 drivers/gpu/drm/drm_gem_shmem_helper.c:214
 drm_gem_shmem_pin_locked+0x223/0x470 drivers/gpu/drm/drm_gem_shmem_helper.c:261
 drm_gem_map_attach+0x184/0x270 drivers/gpu/drm/drm_prime.c:620
 dma_buf_dynamic_attach+0x1f3/0x530 drivers/dma-buf/dma-buf.c:974
 drm_gem_shmem_prime_import_no_map drivers/gpu/drm/drm_gem_shmem_helper.c:835 [inline]
 drm_gem_shmem_prime_import_no_map+0x67/0x3c0 drivers/gpu/drm/drm_gem_shmem_helper.c:816
 drm_gem_prime_fd_to_handle+0x1a9/0x5f0 drivers/gpu/drm/drm_prime.c:313
 drm_prime_fd_to_handle_ioctl+0xd6/0x110 drivers/gpu/drm/drm_prime.c:371
 drm_ioctl_kernel+0x1f4/0x3e0 drivers/gpu/drm/drm_ioctl.c:797
 drm_ioctl+0x5c9/0xc30 drivers/gpu/drm/drm_ioctl.c:894
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:597 [inline]
 __se_sys_ioctl fs/ioctl.c:583 [inline]
 __x64_sys_ioctl+0x18e/0x210 fs/ioctl.c:583
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0xfa0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fe7db38eec9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fe7dc172038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fe7db5e6180 RCX: 00007fe7db38eec9
RDX: 0000200000000300 RSI: 00000000c00c642e RDI: 0000000000000008
RBP: 00007fe7db411f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fe7db5e6218 R14: 00007fe7db5e6180 R15: 00007ffc21f30068
 </TASK>

Allocated by task 18825:
 kasan_save_stack+0x33/0x60 mm/kasan/common.c:56
 kasan_save_track+0x14/0x30 mm/kasan/common.c:77
 poison_kmalloc_redzone mm/kasan/common.c:400 [inline]
 __kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:417
 kasan_kmalloc include/linux/kasan.h:262 [inline]
 __do_kmalloc_node mm/slub.c:5627 [inline]
 __kvmalloc_node_noprof+0x3a3/0x9c0 mm/slub.c:7081
 kvmalloc_array_node_noprof include/linux/slab.h:1122 [inline]
 drm_gem_get_pages+0x144/0xa10 drivers/gpu/drm/drm_gem.c:647
 drm_gem_shmem_get_pages_locked+0x1e6/0x490 drivers/gpu/drm/drm_gem_shmem_helper.c:200
 drm_gem_shmem_pin_locked+0x223/0x470 drivers/gpu/drm/drm_gem_shmem_helper.c:261
 drm_gem_map_attach+0x184/0x270 drivers/gpu/drm/drm_prime.c:620
 dma_buf_dynamic_attach+0x1f3/0x530 drivers/dma-buf/dma-buf.c:974
 drm_gem_shmem_prime_import_no_map drivers/gpu/drm/drm_gem_shmem_helper.c:835 [inline]
 drm_gem_shmem_prime_import_no_map+0x67/0x3c0 drivers/gpu/drm/drm_gem_shmem_helper.c:816
 drm_gem_prime_fd_to_handle+0x1a9/0x5f0 drivers/gpu/drm/drm_prime.c:313
 drm_prime_fd_to_handle_ioctl+0xd6/0x110 drivers/gpu/drm/drm_prime.c:371
 drm_ioctl_kernel+0x1f4/0x3e0 drivers/gpu/drm/drm_ioctl.c:797
 drm_ioctl+0x5c9/0xc30 drivers/gpu/drm/drm_ioctl.c:894
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:597 [inline]
 __se_sys_ioctl fs/ioctl.c:583 [inline]
 __x64_sys_ioctl+0x18e/0x210 fs/ioctl.c:583
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0xfa0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

The buggy address belongs to the object at ffff888055911000
 which belongs to the cache kmalloc-2k of size 2048
The buggy address is located 0 bytes to the right of
 allocated 1032-byte region [ffff888055911000, ffff888055911408)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x55910
head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000040 ffff88813ffa7000 dead000000000100 dead000000000122
raw: 0000000000000000 0000000080080008 00000000f5000000 0000000000000000
head: 00fff00000000040 ffff88813ffa7000 dead000000000100 dead000000000122
head: 0000000000000000 0000000080080008 00000000f5000000 0000000000000000
head: 00fff00000000003 ffffea0001564401 00000000ffffffff 00000000ffffffff
head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000008
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 5831, tgid 5831 (syz-executor), ts 114960089299, free_ts 36419860542
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x1c0/0x230 mm/page_alloc.c:1850
 prep_new_page mm/page_alloc.c:1858 [inline]
 get_page_from_freelist+0x10a3/0x3a30 mm/page_alloc.c:3884
 __alloc_frozen_pages_noprof+0x25f/0x2470 mm/page_alloc.c:5183
 alloc_pages_mpol+0x1fb/0x550 mm/mempolicy.c:2416
 alloc_slab_page mm/slub.c:3039 [inline]
 allocate_slab mm/slub.c:3212 [inline]
 new_slab+0x24a/0x360 mm/slub.c:3266
 ___slab_alloc+0xdc4/0x1ae0 mm/slub.c:4636
 __slab_alloc.constprop.0+0x63/0x110 mm/slub.c:4755
 __slab_alloc_node mm/slub.c:4831 [inline]
 slab_alloc_node mm/slub.c:5253 [inline]
 __do_kmalloc_node mm/slub.c:5626 [inline]
 __kmalloc_node_noprof+0x4dd/0x8a0 mm/slub.c:5633
 kmalloc_node_noprof include/linux/slab.h:987 [inline]
 qdisc_alloc+0xbb/0xc50 net/sched/sch_generic.c:950
 qdisc_create_dflt+0x94/0x490 net/sched/sch_generic.c:1012
 attach_one_default_qdisc net/sched/sch_generic.c:1178 [inline]
 netdev_for_each_tx_queue include/linux/netdevice.h:2664 [inline]
 attach_default_qdiscs net/sched/sch_generic.c:1196 [inline]
 dev_activate+0x63f/0x12d0 net/sched/sch_generic.c:1255
 __dev_open+0x432/0x7c0 net/core/dev.c:1691
 __dev_change_flags+0x55d/0x720 net/core/dev.c:9637
 netif_change_flags+0x8d/0x160 net/core/dev.c:9700
 do_setlink.constprop.0+0xb53/0x4380 net/core/rtnetlink.c:3151
 rtnl_changelink net/core/rtnetlink.c:3769 [inline]
 __rtnl_newlink net/core/rtnetlink.c:3928 [inline]
 rtnl_newlink+0x1446/0x2000 net/core/rtnetlink.c:4065
page last free pid 1 tgid 1 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 free_pages_prepare mm/page_alloc.c:1394 [inline]
 __free_frozen_pages+0x7df/0x1160 mm/page_alloc.c:2906
 __free_pages mm/page_alloc.c:5302 [inline]
 free_contig_range+0x183/0x4b0 mm/page_alloc.c:7146
 destroy_args+0xb69/0x12e0 mm/debug_vm_pgtable.c:958
 debug_vm_pgtable+0x1a32/0x3640 mm/debug_vm_pgtable.c:1345
 do_one_initcall+0x123/0x6e0 init/main.c:1283
 do_initcall_level init/main.c:1345 [inline]
 do_initcalls init/main.c:1361 [inline]
 do_basic_setup init/main.c:1380 [inline]
 kernel_init_freeable+0x5c8/0x920 init/main.c:1593
 kernel_init+0x1c/0x2b0 init/main.c:1483
 ret_from_fork+0x675/0x7d0 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

Memory state around the buggy address:
 ffff888055911300: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff888055911380: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff888055911400: 00 fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
                      ^
 ffff888055911480: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff888055911500: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================