==================================================================
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 5120 at addr ffffc9000d95bc40 by task vivid-000-vid-c/29787

CPU: 0 UID: 0 PID: 29787 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 07/24/2026
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+0x927/0x11e0 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 12-page vmalloc region starting at 0xffffc9000d951000 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:0xffff888041fde200 pfn:0x41fde
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000000000 0000000000000000 ffffea000107f790 0000000000000000
raw: ffff888041fde200 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 0x1029c2(GFP_NOWAIT|__GFP_HIGHMEM|__GFP_IO|__GFP_FS|__GFP_ZERO|__GFP_HARDWALL), pid 29786, tgid 29777 (syz.8.6567), ts 2019975697316
 set_page_owner include/linux/page_owner.h:33 [inline]
 post_alloc_hook+0x1f9/0x250 mm/page_alloc.c:1871
 prep_new_page mm/page_alloc.c:1879 [inline]
 get_page_from_freelist+0x2209/0x2280 mm/page_alloc.c:3943
 __alloc_frozen_pages_noprof+0x217/0x5a0 mm/page_alloc.c:5436
 alloc_pages_mpol+0x21e/0x390 mm/mempolicy.c:2486
 alloc_frozen_pages_noprof mm/mempolicy.c:2557 [inline]
 alloc_pages_noprof+0xb1/0x2b0 mm/mempolicy.c:2577
 vm_area_alloc_pages mm/vmalloc.c:3689 [inline]
 __vmalloc_area_node mm/vmalloc.c:3914 [inline]
 __vmalloc_node_range_noprof+0x6e5/0x1540 mm/vmalloc.c:4104
 vmalloc_user_noprof+0xad/0xe0 mm/vmalloc.c:4259
 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_core_poll+0x4b0/0x830 drivers/media/common/videobuf2/videobuf2-core.c:2713
 vb2_poll drivers/media/common/videobuf2/videobuf2-v4l2.c:966 [inline]
 vb2_fop_poll+0x196/0x310 drivers/media/common/videobuf2/videobuf2-v4l2.c:1232
 v4l2_poll+0x147/0x2c0 drivers/media/v4l2-core/v4l2-dev.c:350
 vfs_poll include/linux/poll.h:82 [inline]
 ep_item_poll fs/eventpoll.c:1344 [inline]
 ep_insert+0x11da/0x1af0 fs/eventpoll.c:1944
 do_epoll_ctl_file+0x8c2/0xee0 fs/eventpoll.c:2695
page last free pid 29754 tgid 29754 ts 2016973084334 stack trace:
 reset_page_owner include/linux/page_owner.h:26 [inline]
 __free_pages_prepare mm/page_alloc.c:1418 [inline]
 __free_frozen_pages+0xc93/0xd90 mm/page_alloc.c:2962
 __slab_free+0x274/0x2c0 mm/slub.c:5815
 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:350
 kasan_slab_alloc include/linux/kasan.h:253 [inline]
 slab_post_alloc_hook mm/slub.c:4683 [inline]
 slab_alloc_node mm/slub.c:4996 [inline]
 kmem_cache_alloc_noprof+0x2b9/0x600 mm/slub.c:5010
 vm_area_alloc+0x24/0x140 mm/vma_init.c:36
 __mmap_new_vma mm/vma.c:2648 [inline]
 __mmap_region mm/vma.c:2879 [inline]
 mmap_region+0x12cb/0x2240 mm/vma.c:2964
 do_mmap+0xe0a/0x1300 mm/mmap.c:573
 vm_mmap_pgoff+0x272/0x4e0 mm/util.c:581
 ksys_mmap_pgoff+0x4dc/0x760 mm/mmap.c:619
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Memory state around the buggy address:
 ffffc9000d95cf00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffffc9000d95cf80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffffc9000d95d000: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8
                   ^
 ffffc9000d95d080: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8
 ffffc9000d95d100: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8
==================================================================