syzbot

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BUG: KASAN: vmalloc-out-of-bounds in tpg_fill_plane_extras drivers/media/common/v4l2-tpg/v4l2-tpg-core.c:2439 [inline]
BUG: KASAN: vmalloc-out-of-bounds in tpg_fill_plane_buffer+0x3c10/0x5c20 drivers/media/common/v4l2-tpg/v4l2-tpg-core.c:2707
Write of size 1 at addr ffffc9000d62b000 by task vivid-000-vid-c/22365

CPU: 1 PID: 22365 Comm: vivid-000-vid-c Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
Call Trace:
 <TASK>
 dump_stack_lvl+0x18c/0x250 lib/dump_stack.c:106
 print_address_description mm/kasan/report.c:364 [inline]
 print_report+0xa8/0x210 mm/kasan/report.c:468
 kasan_report+0x117/0x150 mm/kasan/report.c:581
 tpg_fill_plane_extras drivers/media/common/v4l2-tpg/v4l2-tpg-core.c:2439 [inline]
 tpg_fill_plane_buffer+0x3c10/0x5c20 drivers/media/common/v4l2-tpg/v4l2-tpg-core.c:2707
 vivid_fillbuff drivers/media/test-drivers/vivid/vivid-kthread-cap.c:449 [inline]
 vivid_thread_vid_cap_tick+0x1f71/0x5e10 drivers/media/test-drivers/vivid/vivid-kthread-cap.c:605
 vivid_thread_vid_cap+0x8d3/0x1140 drivers/media/test-drivers/vivid/vivid-kthread-cap.c:743
 kthread+0x2fa/0x390 kernel/kthread.c:388
 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
 </TASK>

The buggy address belongs to a 18-page vmalloc region starting at 0xffffc9000d619000 allocated at vb2_vmalloc_alloc+0xef/0x330 drivers/media/common/videobuf2/videobuf2-vmalloc.c:47
Memory state around the buggy address:
 ffffc9000d62af00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffffc9000d62af80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffffc9000d62b000: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8
                   ^
 ffffc9000d62b080: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8
 ffffc9000d62b100: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8
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