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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+0x3dec/0x5ec0 drivers/media/common/v4l2-tpg/v4l2-tpg-core.c:2707
Write of size 1 at addr ffffc9000423b000 by task vivid-000-vid-c/2773

CPU: 1 UID: 0 PID: 2773 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 02/12/2026
Call Trace:
 <TASK>
 dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
 print_address_description mm/kasan/report.c:378 [inline]
 print_report+0xba/0x230 mm/kasan/report.c:482
 kasan_report+0x117/0x150 mm/kasan/report.c:595
 tpg_fill_plane_extras drivers/media/common/v4l2-tpg/v4l2-tpg-core.c:2439 [inline]
 tpg_fill_plane_buffer+0x3dec/0x5ec0 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+0x1021/0x5fd0 drivers/media/test-drivers/vivid/vivid-kthread-cap.c:629
 vivid_thread_vid_cap+0x909/0x1190 drivers/media/test-drivers/vivid/vivid-kthread-cap.c:767
 kthread+0x388/0x470 kernel/kthread.c:436
 ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>

The buggy address belongs to a vmalloc virtual mapping
Memory state around the buggy address:
 ffffc9000423af00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffffc9000423af80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffffc9000423b000: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8
                   ^
 ffffc9000423b080: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8
 ffffc9000423b100: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8
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