================================================================== 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 720 at addr ffffc90006082d40 by task vivid-000-vid-c/32203 CPU: 0 UID: 0 PID: 32203 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 09/16/2026 Call Trace: 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 The buggy address belongs to a 2-page vmalloc region starting at 0xffffc90006081000 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:0xffffffffffffffff pfn:0x404a5 flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000000000 0000000000000000 00000000ffffffff 0000000000000000 raw: ffffffffffffffff 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 32202, tgid 32201 (syz.0.7773), ts 1501399115020 set_page_owner include/linux/page_owner.h:33 [inline] post_alloc_hook+0x1f9/0x250 mm/page_alloc.c:1854 prep_new_page mm/page_alloc.c:1862 [inline] get_page_from_freelist+0x220f/0x2280 mm/page_alloc.c:3933 __alloc_frozen_pages_noprof+0x1fc/0x400 mm/page_alloc.c:5429 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:3693 [inline] __vmalloc_area_node mm/vmalloc.c:3915 [inline] __vmalloc_node_range_noprof+0x9c2/0x16f0 mm/vmalloc.c:4119 vmalloc_user_noprof+0xad/0xe0 mm/vmalloc.c:4274 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 32200 tgid 32200 ts 1501371851960 stack trace: reset_page_owner include/linux/page_owner.h:26 [inline] __free_pages_prepare mm/page_alloc.c:1401 [inline] __free_frozen_pages+0xc97/0xd90 mm/page_alloc.c:2952 mm_free_pgd kernel/fork.c:591 [inline] __mmdrop+0xbc/0x4d0 kernel/fork.c:734 exit_mm+0x18e/0x240 kernel/exit.c:586 do_exit+0x6a8/0x2360 kernel/exit.c:967 __do_sys_exit kernel/exit.c:1090 [inline] __se_sys_exit kernel/exit.c:1088 [inline] __pfx___ia32_sys_exit+0x0/0x10 kernel/exit.c:1088 x64_sys_call+0x18b4/0x18d0 arch/x86/include/generated/asm/syscalls_64.h:61 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: ffffc90006082f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffffc90006082f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffffc90006083000: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 ^ ffffc90006083080: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 ffffc90006083100: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 ==================================================================