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BUG: KASAN: vmalloc-out-of-bounds in tpg_fill_plane_buffer+0x1220/0x22b0 drivers/media/common/v4l2-tpg/v4l2-tpg-core.c:2707
Write of size 640 at addr ffffc900052a5da0 by task vivid-000-vid-c/20831

CPU: 0 UID: 0 PID: 20831 Comm: vivid-000-vid-c Tainted: G             L       syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/07/2026
Call Trace:
 <TASK>
 dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
 print_address_description+0x55/0x1e0 mm/kasan/report.c:378
 print_report+0x58/0x70 mm/kasan/report.c:482
 kasan_report+0x117/0x150 mm/kasan/report.c:595
 check_region_inline mm/kasan/generic.c:-1 [inline]
 kasan_check_range+0x264/0x2c0 mm/kasan/generic.c:200
 __asan_memcpy+0x40/0x70 mm/kasan/shadow.c:106
 tpg_fill_plane_buffer+0x1220/0x22b0 drivers/media/common/v4l2-tpg/v4l2-tpg-core.c:2707
 vivid_fillbuff drivers/media/test-drivers/vivid/vivid-kthread-cap.c:470 [inline]
 vivid_thread_vid_cap_tick+0x115c/0x6340 drivers/media/test-drivers/vivid/vivid-kthread-cap.c:629
 vivid_thread_vid_cap+0x922/0x11d0 drivers/media/test-drivers/vivid/vivid-kthread-cap.c:767
 kthread+0x38b/0x480 kernel/kthread.c:436
 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>

The buggy address belongs to a 4-page vmalloc region starting at 0xffffc900052a2000 allocated at vb2_vmalloc_alloc+0xef/0x360 drivers/media/common/videobuf2/videobuf2-vmalloc.c:47
The buggy address belongs to the physical page:
page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x401c4 pfn:0x2233f
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000000000 0000000000000000 dead000000000122 0000000000000000
raw: 00000000000401c4 0000000000000000 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x29c2(GFP_NOWAIT|__GFP_HIGHMEM|__GFP_IO|__GFP_FS|__GFP_ZERO), pid 20822, tgid 20814 (syz.0.4087), ts 1320897513759
 set_page_owner include/linux/page_owner.h:33 [inline]
 post_alloc_hook+0x1f9/0x250 mm/page_alloc.c:1856
 prep_new_page mm/page_alloc.c:1864 [inline]
 get_page_from_freelist+0x220f/0x2280 mm/page_alloc.c:3935
 __alloc_frozen_pages_noprof+0x1fe/0x410 mm/page_alloc.c:5444
 alloc_pages_mpol+0x21e/0x390 mm/mempolicy.c:2511
 alloc_frozen_pages_noprof mm/mempolicy.c:2582 [inline]
 alloc_pages_noprof+0xb1/0x2b0 mm/mempolicy.c:2602
 vm_area_alloc_pages mm/vmalloc.c:3726 [inline]
 __vmalloc_area_node mm/vmalloc.c:3948 [inline]
 __vmalloc_node_range_noprof+0x9c2/0x16f0 mm/vmalloc.c:4152
 vmalloc_user_noprof+0xad/0xe0 mm/vmalloc.c:4307
 vb2_vmalloc_alloc+0xef/0x360 drivers/media/common/videobuf2/videobuf2-vmalloc.c:47
 __vb2_buf_mem_alloc drivers/media/common/videobuf2/videobuf2-core.c:242 [inline]
 __vb2_queue_alloc+0xa0b/0x1660 drivers/media/common/videobuf2/videobuf2-core.c:523
 vb2_core_reqbufs+0xc3f/0x1470 drivers/media/common/videobuf2/videobuf2-core.c:958
 __vb2_init_fileio+0x310/0x1040 drivers/media/common/videobuf2/videobuf2-core.c:2879
 __vb2_perform_fileio+0x287/0x1660 drivers/media/common/videobuf2/videobuf2-core.c:3025
 vb2_fop_read+0x282/0x360 drivers/media/common/videobuf2/videobuf2-v4l2.c:1202
 v4l2_read+0x19c/0x2c0 drivers/media/v4l2-core/v4l2-dev.c:316
 do_loop_readv_writev fs/read_write.c:848 [inline]
 vfs_readv+0x57c/0x850 fs/read_write.c:1021
 do_preadv fs/read_write.c:1133 [inline]
 __do_sys_preadv fs/read_write.c:1180 [inline]
 __se_sys_preadv fs/read_write.c:1175 [inline]
 __x64_sys_preadv+0x19c/0x2b0 fs/read_write.c:1175
page last free pid 20827 tgid 20823 ts 1320847393045 stack trace:
 reset_page_owner include/linux/page_owner.h:26 [inline]
 __free_pages_prepare mm/page_alloc.c:1403 [inline]
 __free_frozen_pages+0xc97/0xd90 mm/page_alloc.c:2954
 __slab_free+0x269/0x2c0 mm/slub.c:5926
 qlink_free mm/kasan/quarantine.c:163 [inline]
 qlist_free_all+0x99/0x100 mm/kasan/quarantine.c:179
 kasan_quarantine_reduce+0x148/0x160 mm/kasan/quarantine.c:286
 __kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:361
 kasan_slab_alloc include/linux/kasan.h:253 [inline]
 slab_post_alloc_hook mm/slub.c:4720 [inline]
 slab_alloc_node mm/slub.c:5033 [inline]
 __do_kmalloc_node mm/slub.c:5530 [inline]
 __kmalloc_noprof+0x302/0x710 mm/slub.c:5556
 _kmalloc_noprof include/linux/slab.h:995 [inline]
 sk_prot_alloc+0xe7/0x210 net/core/sock.c:2281
 sk_alloc+0x3a/0x390 net/core/sock.c:2337
 tun_chr_open+0x79/0x510 drivers/net/tun.c:3570
 misc_open+0x2d5/0x350 drivers/char/misc.c:163
 chrdev_open+0x4d9/0x600 fs/char_dev.c:413
 do_dentry_open+0x80e/0x1360 fs/open.c:1000
 vfs_open_consume+0x4a/0x350 fs/open.c:1131
 do_open fs/namei.c:4845 [inline]
 path_openat+0x16fc/0x20f0 fs/namei.c:5010
 do_file_open+0x23e/0x4a0 fs/namei.c:5039
 do_sys_openat2+0x115/0x200 fs/open.c:1442

Memory state around the buggy address:
 ffffc900052a5f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffffc900052a5f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffffc900052a6000: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8
                   ^
 ffffc900052a6080: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8
 ffffc900052a6100: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8
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