================================================================== BUG: KASAN: vmalloc-out-of-bounds in tpg_fill_plane_buffer+0x1b0e/0x5d50 drivers/media/common/v4l2-tpg/v4l2-tpg-core.c:2705 Write of size 2560 at addr ffffc9000aec4620 by task vivid-000-vid-c/2787 CPU: 1 UID: 0 PID: 2787 Comm: vivid-000-vid-c Not tainted 6.14.0-syzkaller-01103-g2df0c02dab82 #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:408 [inline] print_report+0x16e/0x5b0 mm/kasan/report.c:521 kasan_report+0x143/0x180 mm/kasan/report.c:634 kasan_check_range+0x28f/0x2a0 mm/kasan/generic.c:189 __asan_memcpy+0x40/0x70 mm/kasan/shadow.c:106 tpg_fill_plane_buffer+0x1b0e/0x5d50 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+0xfd1/0x60d0 drivers/media/test-drivers/vivid/vivid-kthread-cap.c:629 vivid_thread_vid_cap+0x91b/0xfa0 drivers/media/test-drivers/vivid/vivid-kthread-cap.c:767 kthread+0x7a9/0x920 kernel/kthread.c:464 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:153 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 The buggy address belongs to the virtual mapping at [ffffc9000aebf000, ffffc9000aec6000) created by: vb2_vmalloc_alloc+0xf2/0x340 drivers/media/common/videobuf2/videobuf2-vmalloc.c:47 The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88807d761e58 pfn:0x7d761 flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000000000 0000000000000000 dead000000000122 0000000000000000 raw: ffff88807d761e58 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_NOWARN|__GFP_ZERO), pid 2786, tgid 2785 (syz.6.7459), ts 1669136433294, free_ts 1669114849782 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1f4/0x240 mm/page_alloc.c:1551 prep_new_page mm/page_alloc.c:1559 [inline] get_page_from_freelist+0x3695/0x37e0 mm/page_alloc.c:3477 __alloc_frozen_pages_noprof+0x2c5/0x7b0 mm/page_alloc.c:4740 alloc_pages_mpol+0x339/0x690 mm/mempolicy.c:2301 alloc_frozen_pages_noprof mm/mempolicy.c:2372 [inline] alloc_pages_noprof+0x121/0x190 mm/mempolicy.c:2392 vm_area_alloc_pages mm/vmalloc.c:3591 [inline] __vmalloc_area_node mm/vmalloc.c:3669 [inline] __vmalloc_node_range_noprof+0x9cb/0x1390 mm/vmalloc.c:3846 vmalloc_user_noprof+0x74/0x80 mm/vmalloc.c:4000 vb2_vmalloc_alloc+0xf2/0x340 drivers/media/common/videobuf2/videobuf2-vmalloc.c:47 __vb2_buf_mem_alloc drivers/media/common/videobuf2/videobuf2-core.c:242 [inline] __vb2_queue_alloc+0xa16/0x16f0 drivers/media/common/videobuf2/videobuf2-core.c:523 vb2_core_reqbufs+0xd3b/0x17d0 drivers/media/common/videobuf2/videobuf2-core.c:964 __vb2_init_fileio+0x319/0xfa0 drivers/media/common/videobuf2/videobuf2-core.c:2895 vb2_core_poll+0x45a/0x7a0 drivers/media/common/videobuf2/videobuf2-core.c:2729 vb2_poll drivers/media/common/videobuf2/videobuf2-v4l2.c:980 [inline] vb2_fop_poll+0x170/0x360 drivers/media/common/videobuf2/videobuf2-v4l2.c:1245 v4l2_poll+0x140/0x2b0 drivers/media/v4l2-core/v4l2-dev.c:350 vfs_poll include/linux/poll.h:82 [inline] do_pollfd fs/select.c:870 [inline] do_poll fs/select.c:913 [inline] do_sys_poll+0xb07/0x1610 fs/select.c:1009 __do_sys_poll fs/select.c:1074 [inline] __se_sys_poll+0x1eb/0x430 fs/select.c:1062 page last free pid 2785 tgid 2785 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1127 [inline] free_frozen_pages+0xe16/0x10f0 mm/page_alloc.c:2660 discard_slab mm/slub.c:2707 [inline] __put_partials+0x160/0x1c0 mm/slub.c:3176 put_cpu_partial+0x17e/0x250 mm/slub.c:3251 __slab_free+0x294/0x390 mm/slub.c:4503 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x9a/0x140 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x14f/0x170 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x23/0x80 mm/kasan/common.c:329 kasan_slab_alloc include/linux/kasan.h:250 [inline] slab_post_alloc_hook mm/slub.c:4138 [inline] slab_alloc_node mm/slub.c:4187 [inline] kmem_cache_alloc_noprof+0x1e1/0x390 mm/slub.c:4194 ptlock_alloc+0x20/0x70 mm/memory.c:7041 ptlock_init include/linux/mm.h:2978 [inline] pagetable_pte_ctor include/linux/mm.h:3026 [inline] __pte_alloc_one_noprof include/asm-generic/pgalloc.h:73 [inline] pte_alloc_one+0x6d/0x160 arch/x86/mm/pgtable.c:17 do_fault_around mm/memory.c:5361 [inline] do_read_fault mm/memory.c:5400 [inline] do_fault mm/memory.c:5543 [inline] do_pte_missing mm/memory.c:4059 [inline] handle_pte_fault mm/memory.c:5888 [inline] __handle_mm_fault+0x2f55/0x6ef0 mm/memory.c:6031 handle_mm_fault+0x3e5/0x8d0 mm/memory.c:6200 do_user_addr_fault arch/x86/mm/fault.c:1337 [inline] handle_page_fault arch/x86/mm/fault.c:1480 [inline] exc_page_fault+0x45b/0x8b0 arch/x86/mm/fault.c:1538 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623 Memory state around the buggy address: ffffc9000aec4f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffffc9000aec4f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffffc9000aec5000: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 ^ ffffc9000aec5080: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 ffffc9000aec5100: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 ==================================================================