================================================================== BUG: KASAN: slab-out-of-bounds in firmware_param_path_get+0x348/0x350 drivers/base/firmware_loader/main.c:531 Write of size 1 at addr ffff88810b289fff by task syz.2.656/2901 CPU: 1 PID: 2901 Comm: syz.2.656 Tainted: G W syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 Call Trace: __dump_stack+0x21/0x30 lib/dump_stack.c:88 dump_stack_lvl+0x110/0x170 lib/dump_stack.c:106 print_address_description+0x7f/0x2c0 mm/kasan/report.c:248 __kasan_report mm/kasan/report.c:427 [inline] kasan_report+0x10f/0x150 mm/kasan/report.c:444 __asan_report_store1_noabort+0x17/0x20 mm/kasan/report_generic.c:311 firmware_param_path_get+0x348/0x350 drivers/base/firmware_loader/main.c:531 param_attr_show+0x150/0x1b0 kernel/params.c:567 module_attr_show+0x56/0x70 kernel/params.c:886 sysfs_kf_seq_show+0x266/0x3d0 fs/sysfs/file.c:61 kernfs_seq_show+0x119/0x160 fs/kernfs/file.c:168 seq_read_iter+0x472/0xce0 fs/seq_file.c:230 kernfs_fop_read_iter+0x146/0x460 fs/kernfs/file.c:241 call_read_iter include/linux/fs.h:2212 [inline] generic_file_splice_read+0x3ea/0x5f0 fs/splice.c:311 do_splice_to fs/splice.c:796 [inline] splice_direct_to_actor+0x40f/0xb40 fs/splice.c:870 do_splice_direct+0x1c2/0x2d0 fs/splice.c:979 do_sendfile+0x515/0xe20 fs/read_write.c:1249 __do_sys_sendfile64 fs/read_write.c:1317 [inline] __se_sys_sendfile64 fs/read_write.c:1303 [inline] __x64_sys_sendfile64+0x199/0x1f0 fs/read_write.c:1303 x64_sys_call+0x88d/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:41 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7ff52c7b91d9 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ff52b212028 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 RAX: ffffffffffffffda RBX: 00007ff52ca40fa0 RCX: 00007ff52c7b91d9 RDX: 0000000000000000 RSI: 0000000000000003 RDI: 0000000000000003 RBP: 00007ff52c850888 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ff52ca41038 R14: 00007ff52ca40fa0 R15: 00007ffd45f09238 Allocated by task 393: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track mm/kasan/common.c:45 [inline] set_alloc_info mm/kasan/common.c:433 [inline] ____kasan_kmalloc mm/kasan/common.c:512 [inline] __kasan_kmalloc+0xd4/0x100 mm/kasan/common.c:521 kasan_kmalloc include/linux/kasan.h:227 [inline] __kmalloc+0x13d/0x2c0 mm/slub.c:4436 __kmalloc_node include/linux/slab.h:487 [inline] kmalloc_node include/linux/slab.h:642 [inline] kvmalloc_node+0x211/0x320 mm/util.c:621 kvmalloc include/linux/mm.h:862 [inline] seq_buf_alloc fs/seq_file.c:38 [inline] seq_read_iter+0x1f1/0xce0 fs/seq_file.c:210 kernfs_fop_read_iter+0x146/0x460 fs/kernfs/file.c:241 call_read_iter include/linux/fs.h:2212 [inline] new_sync_read fs/read_write.c:404 [inline] vfs_read+0x6c0/0xc20 fs/read_write.c:485 ksys_read+0x14a/0x260 fs/read_write.c:623 __do_sys_read fs/read_write.c:633 [inline] __se_sys_read fs/read_write.c:631 [inline] __x64_sys_read+0x7b/0x90 fs/read_write.c:631 x64_sys_call+0x96d/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:1 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 Freed by task 393: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track+0x4a/0x70 mm/kasan/common.c:45 kasan_set_free_info+0x23/0x40 mm/kasan/generic.c:370 ____kasan_slab_free+0x125/0x160 mm/kasan/common.c:365 __kasan_slab_free+0x11/0x20 mm/kasan/common.c:373 kasan_slab_free include/linux/kasan.h:193 [inline] slab_free_hook mm/slub.c:1728 [inline] slab_free_freelist_hook+0xc2/0x190 mm/slub.c:1754 slab_free mm/slub.c:3526 [inline] kfree+0xc4/0x270 mm/slub.c:4588 kvfree+0x35/0x40 mm/util.c:661 seq_release+0x57/0x70 fs/seq_file.c:355 kernfs_fop_release+0x195/0x240 fs/kernfs/file.c:761 __fput+0x22b/0x900 fs/file_table.c:311 ____fput+0x15/0x20 fs/file_table.c:339 task_work_run+0x127/0x190 kernel/task_work.c:188 tracehook_notify_resume include/linux/tracehook.h:189 [inline] exit_to_user_mode_loop+0xd0/0xe0 kernel/entry/common.c:184 exit_to_user_mode_prepare+0x87/0xd0 kernel/entry/common.c:217 __syscall_exit_to_user_mode_work kernel/entry/common.c:299 [inline] syscall_exit_to_user_mode+0x1a/0x30 kernel/entry/common.c:310 do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x66/0xd0 The buggy address belongs to the object at ffff88810b288000 which belongs to the cache kmalloc-4k of size 4096 The buggy address is located 4095 bytes to the right of 4096-byte region [ffff88810b288000, ffff88810b289000) The buggy address belongs to the page: page:ffffea00042ca200 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x10b288 head:ffffea00042ca200 order:3 compound_mapcount:0 compound_pincount:0 flags: 0x4000000000010200(slab|head|zone=1) raw: 4000000000010200 dead000000000100 dead000000000122 ffff888100043380 raw: 0000000000000000 0000000080040004 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd2000(__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 1, ts 1992814280, free_ts 0 set_page_owner include/linux/page_owner.h:33 [inline] post_alloc_hook+0x192/0x1b0 mm/page_alloc.c:2607 prep_new_page+0x1c/0x110 mm/page_alloc.c:2613 get_page_from_freelist+0x2c3a/0x2cd0 mm/page_alloc.c:4487 __alloc_pages+0x1a2/0x460 mm/page_alloc.c:5824 alloc_slab_page mm/slub.c:-1 [inline] allocate_slab mm/slub.c:1937 [inline] new_slab+0xa0/0x4d0 mm/slub.c:2000 ___slab_alloc+0x3ac/0x840 mm/slub.c:3033 __slab_alloc+0x49/0x90 mm/slub.c:3120 slab_alloc_node mm/slub.c:3211 [inline] slab_alloc mm/slub.c:3255 [inline] __kmalloc+0x16a/0x2c0 mm/slub.c:4432 __kmalloc_node include/linux/slab.h:487 [inline] kmalloc_array_node include/linux/slab.h:712 [inline] kcalloc_node include/linux/slab.h:717 [inline] sbitmap_init_node+0x2b7/0x720 lib/sbitmap.c:114 scsi_realloc_sdev_budget_map+0x26d/0x3e0 drivers/scsi/scsi_scan.c:230 scsi_alloc_sdev+0x762/0x9c0 drivers/scsi/scsi_scan.c:341 scsi_probe_and_add_lun+0x180/0x35d0 drivers/scsi/scsi_scan.c:1156 __scsi_scan_target+0x1d2/0xb70 drivers/scsi/scsi_scan.c:1637 scsi_scan_channel drivers/scsi/scsi_scan.c:1725 [inline] scsi_scan_host_selected+0x34e/0x600 drivers/scsi/scsi_scan.c:1754 do_scsi_scan_host drivers/scsi/scsi_scan.c:1893 [inline] scsi_scan_host+0x39e/0x670 drivers/scsi/scsi_scan.c:1923 virtscsi_probe+0x95a/0xb00 drivers/scsi/virtio_scsi.c:915 page_owner free stack trace missing Memory state around the buggy address: ffff88810b289e80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88810b289f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88810b289f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff88810b28a000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88810b28a080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================