syzbot

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BUG: KASAN: vmalloc-out-of-bounds in tpg_fill_plane_pattern drivers/media/common/v4l2-tpg/v4l2-tpg-core.c:-1 [inline]
BUG: KASAN: vmalloc-out-of-bounds in tpg_fill_plane_buffer+0x1b4f/0x5ea0 drivers/media/common/v4l2-tpg/v4l2-tpg-core.c:2705
Write of size 1280 at addr ffffc900024feb40 by task vivid-000-vid-c/20001

CPU: 0 UID: 0 PID: 20001 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 06/10/2026
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_pattern drivers/media/common/v4l2-tpg/v4l2-tpg-core.c:-1 [inline]
 tpg_fill_plane_buffer+0x1b4f/0x5ea0 drivers/media/common/v4l2-tpg/v4l2-tpg-core.c:2705
 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+0x388/0x470 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 3-page vmalloc region starting at 0xffffc900024fc000 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:0xffff888042d2e000 pfn:0x42d2e
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000000000 0000000000000000 dead000000000122 0000000000000000
raw: ffff888042d2e000 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 0x2dc2(GFP_KERNEL|__GFP_HIGHMEM|__GFP_ZERO|__GFP_NOWARN), pid 20000, tgid 19999 (syz.8.3151), ts 1391379806810, free_ts 1391379602120
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x1f9/0x250 mm/page_alloc.c:1859
 prep_new_page mm/page_alloc.c:1867 [inline]
 get_page_from_freelist+0x21fa/0x2270 mm/page_alloc.c:3946
 __alloc_frozen_pages_noprof+0x18d/0x380 mm/page_alloc.c:5304
 __alloc_pages_noprof+0x10/0x100 mm/page_alloc.c:5338
 alloc_pages_bulk_noprof+0x5f5/0x7b0 mm/page_alloc.c:5230
 alloc_pages_bulk_mempolicy_noprof+0x34b/0x1690 mm/mempolicy.c:2798
 vm_area_alloc_pages mm/vmalloc.c:3714 [inline]
 __vmalloc_area_node mm/vmalloc.c:3892 [inline]
 __vmalloc_node_range_noprof+0xb1d/0x1730 mm/vmalloc.c:4082
 vmalloc_user_noprof+0xad/0xe0 mm/vmalloc.c:4237
 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:979 [inline]
 vb2_fop_poll+0x196/0x310 drivers/media/common/videobuf2/videobuf2-v4l2.c:1245
 v4l2_poll+0x147/0x2c0 drivers/media/v4l2-core/v4l2-dev.c:350
 vfs_poll include/linux/poll.h:82 [inline]
 do_pollfd fs/select.c:877 [inline]
 do_poll fs/select.c:920 [inline]
 do_sys_poll+0x990/0x1110 fs/select.c:1015
page last free pid 20000 tgid 19999 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 __free_pages_prepare mm/page_alloc.c:1406 [inline]
 __free_frozen_pages+0xc1e/0xd10 mm/page_alloc.c:2950
 __kasan_populate_vmalloc_do mm/kasan/shadow.c:393 [inline]
 __kasan_populate_vmalloc+0x1a8/0x1c0 mm/kasan/shadow.c:424
 kasan_populate_vmalloc include/linux/kasan.h:580 [inline]
 alloc_vmap_area+0xd1a/0x1420 mm/vmalloc.c:2123
 __get_vm_area_node+0x1f2/0x300 mm/vmalloc.c:3226
 __vmalloc_node_range_noprof+0x358/0x1730 mm/vmalloc.c:4042
 vmalloc_user_noprof+0xad/0xe0 mm/vmalloc.c:4237
 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:979 [inline]
 vb2_fop_poll+0x196/0x310 drivers/media/common/videobuf2/videobuf2-v4l2.c:1245
 v4l2_poll+0x147/0x2c0 drivers/media/v4l2-core/v4l2-dev.c:350
 vfs_poll include/linux/poll.h:82 [inline]
 do_pollfd fs/select.c:877 [inline]
 do_poll fs/select.c:920 [inline]
 do_sys_poll+0x990/0x1110 fs/select.c:1015
 __do_sys_ppoll fs/select.c:1112 [inline]
 __se_sys_ppoll+0x209/0x2b0 fs/select.c:1092
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94

Memory state around the buggy address:
 ffffc900024fef00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffffc900024fef80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffffc900024ff000: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8
                   ^
 ffffc900024ff080: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8
 ffffc900024ff100: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8
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