KASAN: vmalloc-out-of-bounds Write in tpg_fill_plane_buffer (5)

Status: upstream: reported C repro on 2026/07/24 20:10
Subsystems: media
Labels: prio:normal
[Documentation on labels]
Reported-by: syzbot+cb43e758a4dc84dd467f@syzkaller.appspotmail.com
First crash: 58d, last: 3d18h
▶ ▼ ✨ AI Jobs (2)
ID Workflow Result Correct Bug Created Started Finished Revision
9040425a repro-c Reproduced: ✅ ❓ KASAN: vmalloc-out-of-bounds Write in tpg_fill_plane_buffer (5) 2026/08/16 13:31 2026/08/16 13:31 2026/08/16 14:55 746171ee
2ad22663 assessment-security DenialOfService: ✅ Exploitable: ✅ FilesystemTrigger: ❌ NetworkTrigger: ❌ PeripheralTrigger: ❌ RemoteTrigger: ❌ Unprivileged: ❌ UserNamespace: ❌ VMGuestTrigger: ❌ VMHostTrigger: ❌ ❓ KASAN: vmalloc-out-of-bounds Write in tpg_fill_plane_buffer (5) 2026/07/17 00:11 2026/07/17 00:11 2026/07/17 00:57 49f47391
▶ ▼ Discussions (3)
Title Replies (including bot) Last reply
[PATCH] media: vivid: round the height down to the vertical subsampling factor 1 (1) 2026/09/05 15:58
[syzbot] [media?] KASAN: vmalloc-out-of-bounds Write in tpg_fill_plane_buffer (5) 0 (2) 2026/08/17 11:02
[syzbot] Monthly media report (Aug 2026) 0 (1) 2026/08/05 00:00
▶ ▼ Similar bugs (10)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-6.1 KASAN: vmalloc-out-of-bounds Write in tpg_fill_plane_buffer 21 3 454d 490d 0/3 auto-obsoleted due to no activity on 2025/09/22 17:26
upstream KASAN: vmalloc-out-of-bounds Write in tpg_fill_plane_buffer (4) prio:normal media 21 255 58d 424d 29/29 fixed on 2026/07/15 08:27
upstream KASAN: vmalloc-out-of-bounds Write in tpg_fill_plane_buffer (3) media 21 syz, C 271 432d 786d 29/29 fixed on 2025/07/08 00:33
upstream KASAN: vmalloc-out-of-bounds Write in tpg_fill_plane_buffer media 21 1 2428d 2427d 0/29 auto-closed as invalid on 2020/05/17 19:44
linux-5.15 KASAN: vmalloc-out-of-bounds Write in tpg_fill_plane_buffer 21 1 1241d 1241d 0/3 auto-obsoleted due to no activity on 2023/08/17 04:37
linux-6.6 KASAN: vmalloc-out-of-bounds Write in tpg_fill_plane_buffer 21 1 79d 79d 0/2 upstream: reported on 2026/06/24 12:36
upstream KASAN: vmalloc-out-of-bounds Write in tpg_fill_plane_buffer (2) media 21 syz, C inconclusive done 14 1320d 1831d 22/29 fixed on 2023/02/24 13:51
linux-4.19 BUG: unable to handle kernel paging request in tpg_fill_plane_buffer (2) 8 syz error 8 1366d 1866d 0/1 upstream: reported syz repro on 2021/08/02 00:51
linux-4.14 BUG: unable to handle kernel paging request in tpg_fill_plane_buffer (2) 8 1 1700d 1700d 0/1 auto-closed as invalid on 2022/05/15 07:48
upstream BUG: unable to handle kernel paging request in tpg_fill_plane_buffer (2) media 8 1 1250d 1246d 0/29 auto-obsoleted due to no activity on 2023/07/09 12:46
▶ ▼ Last patch testing requests (1)
Created Duration User Patch Repo Result
2026/08/17 08:59 20m nogikh@google.com upstream report job log log

Sample crash report:
BUG: KASAN: vmalloc-out-of-bounds in tpg_fill_plane_pattern drivers/media/common/v4l2-tpg/v4l2-tpg-core.c:2617 [inline]
BUG: KASAN: vmalloc-out-of-bounds in tpg_fill_plane_buffer+0x2063/0x4160 drivers/media/common/v4l2-tpg/v4l2-tpg-core.c:2705
Write of size 720 at addr ffffc900038f9d50 by task vivid-000-vid-c/6017

CPU: 0 UID: 0 PID: 6017 Comm: vivid-000-vid-c Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x100/0x190 lib/dump_stack.c:120
 print_address_description mm/kasan/report.c:378 [inline]
 print_report+0x13d/0x4b0 mm/kasan/report.c:482
 kasan_report+0xdf/0x1c0 mm/kasan/report.c:595
 check_region_inline mm/kasan/generic.c:186 [inline]
 kasan_check_range+0x10f/0x1e0 mm/kasan/generic.c:200
 __asan_memcpy+0x3c/0x60 mm/kasan/shadow.c:106
 tpg_fill_plane_pattern drivers/media/common/v4l2-tpg/v4l2-tpg-core.c:2617 [inline]
 tpg_fill_plane_buffer+0x2063/0x4160 drivers/media/common/v4l2-tpg/v4l2-tpg-core.c:2705
 vivid_fillbuff+0x963/0x3ff0 drivers/media/test-drivers/vivid/vivid-kthread-cap.c:470
 vivid_thread_vid_cap_tick+0x81b/0x1470 drivers/media/test-drivers/vivid/vivid-kthread-cap.c:629
 vivid_thread_vid_cap+0x454/0xd70 drivers/media/test-drivers/vivid/vivid-kthread-cap.c:767
 kthread+0x370/0x450 kernel/kthread.c:436
 ret_from_fork+0x72b/0xd50 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 vmalloc virtual mapping
The buggy address belongs to the physical page:
page: refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88802a460000 pfn:0x2a460
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000000000 0000000000000000 dead000000000122 0000000000000000
raw: ffff88802a460000 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 6016, tgid 6016 (syz-executor373), ts 77775340251, free_ts 77775265836
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0xfd/0x120 mm/page_alloc.c:1859
 prep_new_page mm/page_alloc.c:1867 [inline]
 get_page_from_freelist+0xf48/0x3530 mm/page_alloc.c:3946
 __alloc_frozen_pages_noprof+0x299/0x2dc0 mm/page_alloc.c:5304
 __alloc_pages_noprof mm/page_alloc.c:5338 [inline]
 alloc_pages_bulk_noprof+0x5de/0x13c0 mm/page_alloc.c:5230
 alloc_pages_bulk_mempolicy_noprof+0x255/0x1270 mm/mempolicy.c:2798
 vm_area_alloc_pages mm/vmalloc.c:3736 [inline]
 __vmalloc_area_node mm/vmalloc.c:3914 [inline]
 __vmalloc_node_range_noprof+0x69d/0x1630 mm/vmalloc.c:4104
 vmalloc_user_noprof+0x9e/0xe0 mm/vmalloc.c:4259
 vb2_vmalloc_alloc+0x135/0x410 drivers/media/common/videobuf2/videobuf2-vmalloc.c:47
 __vb2_buf_mem_alloc drivers/media/common/videobuf2/videobuf2-core.c:242 [inline]
 __vb2_queue_alloc+0x8d5/0x1160 drivers/media/common/videobuf2/videobuf2-core.c:523
 vb2_core_reqbufs+0x899/0xf30 drivers/media/common/videobuf2/videobuf2-core.c:958
 vb2_ioctl_reqbufs+0x291/0x450 drivers/media/common/videobuf2/videobuf2-v4l2.c:1036
 vidioc_reqbufs+0x86/0x100 drivers/media/test-drivers/vivid/vivid-core.c:709
 v4l_reqbufs+0x175/0x1d0 drivers/media/v4l2-core/v4l2-ioctl.c:2171
 __video_do_ioctl+0xb2a/0xdf0 drivers/media/v4l2-core/v4l2-ioctl.c:3133
 video_usercopy+0x47a/0x1730 drivers/media/v4l2-core/v4l2-ioctl.c:3475
 v4l2_ioctl+0x1bd/0x250 drivers/media/v4l2-core/v4l2-dev.c:366
page last free pid 6016 tgid 6016 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 __free_pages_prepare mm/page_alloc.c:1406 [inline]
 __free_frozen_pages+0x79f/0x1090 mm/page_alloc.c:2950
 __kasan_populate_vmalloc_do mm/kasan/shadow.c:393 [inline]
 __kasan_populate_vmalloc+0x1ea/0x210 mm/kasan/shadow.c:424
 kasan_populate_vmalloc include/linux/kasan.h:580 [inline]
 alloc_vmap_area+0x95d/0x2bb0 mm/vmalloc.c:2145
 __get_vm_area_node+0x1ca/0x330 mm/vmalloc.c:3248
 __vmalloc_node_range_noprof+0x228/0x1630 mm/vmalloc.c:4064
 vmalloc_user_noprof+0x9e/0xe0 mm/vmalloc.c:4259
 vb2_vmalloc_alloc+0x135/0x410 drivers/media/common/videobuf2/videobuf2-vmalloc.c:47
 __vb2_buf_mem_alloc drivers/media/common/videobuf2/videobuf2-core.c:242 [inline]
 __vb2_queue_alloc+0x8d5/0x1160 drivers/media/common/videobuf2/videobuf2-core.c:523
 vb2_core_reqbufs+0x899/0xf30 drivers/media/common/videobuf2/videobuf2-core.c:958
 vb2_ioctl_reqbufs+0x291/0x450 drivers/media/common/videobuf2/videobuf2-v4l2.c:1036
 vidioc_reqbufs+0x86/0x100 drivers/media/test-drivers/vivid/vivid-core.c:709
 v4l_reqbufs+0x175/0x1d0 drivers/media/v4l2-core/v4l2-ioctl.c:2171
 __video_do_ioctl+0xb2a/0xdf0 drivers/media/v4l2-core/v4l2-ioctl.c:3133
 video_usercopy+0x47a/0x1730 drivers/media/v4l2-core/v4l2-ioctl.c:3475
 v4l2_ioctl+0x1bd/0x250 drivers/media/v4l2-core/v4l2-dev.c:366
 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

Memory state around the buggy address:
 ffffc900038f9f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffffc900038f9f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffffc900038fa000: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8
                   ^
 ffffc900038fa080: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8
 ffffc900038fa100: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8
==================================================================

Crashes (30):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/08/17 11:01 upstream 8d3ae59288f1 7664cf44 .config console log report C ci-qemu-upstream KASAN: vmalloc-out-of-bounds Write in tpg_fill_plane_buffer
2026/09/08 01:37 upstream c297ed90fbba 680aa3e1 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce KASAN: vmalloc-out-of-bounds Write in tpg_fill_plane_buffer
2026/09/07 02:28 upstream df2908090cda 4f7b22a0 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce KASAN: vmalloc-out-of-bounds Write in tpg_fill_plane_buffer
2026/09/05 12:44 upstream 654ae5d73c05 4f7b22a0 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce KASAN: vmalloc-out-of-bounds Write in tpg_fill_plane_buffer
2026/09/05 07:10 upstream 654ae5d73c05 4f7b22a0 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce KASAN: vmalloc-out-of-bounds Write in tpg_fill_plane_buffer
2026/09/04 23:28 upstream bc35965f6940 3f042c7b .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce KASAN: vmalloc-out-of-bounds Write in tpg_fill_plane_buffer
2026/08/31 13:50 upstream a23cbb05744b 2f52988a .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce KASAN: vmalloc-out-of-bounds Write in tpg_fill_plane_buffer
2026/08/30 05:22 upstream 08dbfad3f504 2f52988a .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce KASAN: vmalloc-out-of-bounds Write in tpg_fill_plane_buffer
2026/08/29 21:54 upstream 08dbfad3f504 2f52988a .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce KASAN: vmalloc-out-of-bounds Write in tpg_fill_plane_buffer
2026/08/29 21:53 upstream 08dbfad3f504 2f52988a .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce KASAN: vmalloc-out-of-bounds Write in tpg_fill_plane_buffer
2026/08/28 17:01 upstream 1b78070aaef6 bcbc8ceb .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce KASAN: vmalloc-out-of-bounds Write in tpg_fill_plane_buffer
2026/08/28 17:01 upstream 1b78070aaef6 bcbc8ceb .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce KASAN: vmalloc-out-of-bounds Write in tpg_fill_plane_buffer
2026/08/27 16:12 upstream 73e3f0710014 e2fa417d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce KASAN: vmalloc-out-of-bounds Write in tpg_fill_plane_buffer
2026/08/26 00:07 upstream 73ae59e97596 614e416a .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce KASAN: vmalloc-out-of-bounds Write in tpg_fill_plane_buffer
2026/08/21 20:27 upstream 818bebeb63dd 1e72964b .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce KASAN: vmalloc-out-of-bounds Write in tpg_fill_plane_buffer
2026/08/21 17:37 upstream 818bebeb63dd 1e72964b .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce KASAN: vmalloc-out-of-bounds Write in tpg_fill_plane_buffer
2026/08/21 12:52 upstream 818bebeb63dd 1e72964b .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce KASAN: vmalloc-out-of-bounds Write in tpg_fill_plane_buffer
2026/07/31 18:04 upstream 8ba098e6b6ff 7664cf44 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce KASAN: vmalloc-out-of-bounds Write in tpg_fill_plane_buffer
2026/08/26 09:17 upstream 45c13f3f9e3b 6a91adb4 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-386 KASAN: vmalloc-out-of-bounds Write in tpg_fill_plane_buffer
2026/08/25 06:05 upstream 66498c75b4f8 23caa175 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-386 KASAN: vmalloc-out-of-bounds Write in tpg_fill_plane_buffer
2026/08/21 16:16 upstream 7f063b2f17ea 1e72964b .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-386 KASAN: vmalloc-out-of-bounds Write in tpg_fill_plane_buffer
2026/08/19 19:14 upstream bd5f485f3f02 1e72964b .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-386 KASAN: vmalloc-out-of-bounds Write in tpg_fill_plane_buffer
2026/08/17 21:16 upstream 8d3ae59288f1 1e72964b .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-386 KASAN: vmalloc-out-of-bounds Write in tpg_fill_plane_buffer
2026/07/27 23:44 upstream f5098b6bae76 4cb2b096 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-386 KASAN: vmalloc-out-of-bounds Write in tpg_fill_plane_buffer
2026/07/24 20:09 upstream 48a5a7ab8d6a 4a865b71 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream KASAN: vmalloc-out-of-bounds Write in tpg_fill_plane_buffer
2026/07/23 23:29 upstream 4539944e5151 4a865b71 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream KASAN: vmalloc-out-of-bounds Write in tpg_fill_plane_buffer
2026/07/19 22:28 upstream c6859eed755d 72524a66 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream KASAN: vmalloc-out-of-bounds Write in tpg_fill_plane_buffer
2026/07/18 22:24 upstream 1229e2e57a5c 72524a66 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream KASAN: vmalloc-out-of-bounds Write in tpg_fill_plane_buffer
2026/07/15 14:21 upstream 58717b2a1365 a4ed0f4f .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream KASAN: vmalloc-out-of-bounds Write in tpg_fill_plane_buffer
2026/08/07 19:55 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci ba5cc80fd326 e4ef95d6 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 KASAN: vmalloc-out-of-bounds Write in tpg_fill_plane_buffer
* Struck through repros no longer work on HEAD.