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17 Aug 2026 04:02:21 -0700 In-Reply-To: <6a63c6bd.a2ea2cc8.fbad6.0008.GAE@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6a82ea3d.10853dc7.22f513.0024.GAE@google.com> Subject: Re: [syzbot] [media?] KASAN: vmalloc-out-of-bounds Write in tpg_fill_plane_buffer (5) From: syzbot To: linux-kernel@vger.kernel.org, linux-media@vger.kernel.org, mchehab@kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" syzbot has found a reproducer for the following issue on: HEAD commit: 8d3ae59288f1 Linux 7.2 git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=14f80679580000 kernel config: https://syzkaller.appspot.com/x/.config?x=1d67342c314f228d dashboard link: https://syzkaller.appspot.com/bug?extid=cb43e758a4dc84dd467f compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=14b9d949580000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+cb43e758a4dc84dd467f@syzkaller.appspotmail.com 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: __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 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 ================================================================== --- If you want syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing.