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BUG: KASAN: vmalloc-out-of-bounds in tpg_fill_plane_buffer+0x1ad6/0x5ca0 drivers/media/common/v4l2-tpg/v4l2-tpg-core.c:2705
Write of size 2560 at addr ffffc900042a3a00 by task vivid-000-vid-c/15919

CPU: 1 UID: 0 PID: 15919 Comm: vivid-000-vid-c Not tainted 6.14.0-rc5-syzkaller-00039-g848e07631744 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Call Trace:
 <TASK>
 __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+0x282/0x290 mm/kasan/generic.c:189
 __asan_memcpy+0x40/0x70 mm/kasan/shadow.c:106
 tpg_fill_plane_buffer+0x1ad6/0x5ca0 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+0xfbc/0x6090 drivers/media/test-drivers/vivid/vivid-kthread-cap.c:629
 vivid_thread_vid_cap+0x8aa/0xf30 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:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>

The buggy address belongs to the virtual mapping at
 [ffffc900042a3000, ffffc900042a5000) 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:0xffff8880706fa000 pfn:0x706fa
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000000000 0000000000000000 dead000000000122 0000000000000000
raw: ffff8880706fa000 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 15913, tgid 15912 (syz.7.1741), ts 550972994049, free_ts 550876386639
 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+0x365c/0x37a0 mm/page_alloc.c:3477
 __alloc_frozen_pages_noprof+0x292/0x710 mm/page_alloc.c:4739
 __alloc_pages_noprof mm/page_alloc.c:4773 [inline]
 alloc_pages_bulk_noprof+0x847/0xae0 mm/page_alloc.c:4693
 alloc_pages_bulk_mempolicy_noprof+0x8db/0x1640 mm/mempolicy.c:2575
 vm_area_alloc_pages mm/vmalloc.c:3565 [inline]
 __vmalloc_area_node mm/vmalloc.c:3669 [inline]
 __vmalloc_node_range_noprof+0x6ed/0x1380 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+0xa0b/0x16f0 drivers/media/common/videobuf2/videobuf2-core.c:523
 vb2_core_reqbufs+0xd2e/0x17c0 drivers/media/common/videobuf2/videobuf2-core.c:964
 __vb2_init_fileio+0x319/0xf90 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+0xa69/0x15d0 fs/select.c:1009
 __do_sys_poll fs/select.c:1074 [inline]
 __se_sys_poll+0x1c5/0x400 fs/select.c:1062
page last free pid 15913 tgid 15912 stack trace:
 create_dummy_stack mm/page_owner.c:94 [inline]
 register_dummy_stack+0x8a/0xe0 mm/page_owner.c:100
 init_page_owner+0x3e/0x7a0 mm/page_owner.c:118
 invoke_init_callbacks mm/page_ext.c:148 [inline]
 page_ext_init+0x731/0x790 mm/page_ext.c:497
 mm_core_init+0x4c/0x60 mm/mm_init.c:2673

Memory state around the buggy address:
 ffffc900042a3f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffffc900042a3f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffffc900042a4000: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8
                   ^
 ffffc900042a4080: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8
 ffffc900042a4100: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8
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