use of bytesused == 0 is deprecated and will be removed in the future,
use the actual size instead.
=====================================================
BUG: KMSAN: uninit-value in kmsan_check_memory+0xd/0x10 mm/kmsan/kmsan_hooks.c:428
CPU: 1 PID: 8705 Comm: syz-executor.0 Not tainted 5.8.0-rc5-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1df/0x240 lib/dump_stack.c:118
 kmsan_report+0xf7/0x1e0 mm/kmsan/kmsan_report.c:121
 kmsan_internal_check_memory+0x238/0x3d0 mm/kmsan/kmsan.c:423
 kmsan_check_memory+0xd/0x10 mm/kmsan/kmsan_hooks.c:428
 instrument_copy_to_user include/linux/instrumented.h:91 [inline]
 _copy_to_user+0x100/0x1d0 lib/usercopy.c:30
 copy_to_user include/linux/uaccess.h:161 [inline]
 video_put_user drivers/media/v4l2-core/v4l2-ioctl.c:3226 [inline]
 video_usercopy+0x248a/0x2c00 drivers/media/v4l2-core/v4l2-ioctl.c:3325
 video_ioctl2+0x9f/0xb0 drivers/media/v4l2-core/v4l2-ioctl.c:3335
 v4l2_ioctl+0x23f/0x270 drivers/media/v4l2-core/v4l2-dev.c:360
 native_ioctl drivers/media/v4l2-core/v4l2-compat-ioctl32.c:117 [inline]
 do_video_ioctl+0x5eb6/0x10f20 drivers/media/v4l2-core/v4l2-compat-ioctl32.c:1670
 v4l2_compat_ioctl32+0x2b7/0x320 drivers/media/v4l2-core/v4l2-compat-ioctl32.c:1790
 __do_compat_sys_ioctl fs/ioctl.c:847 [inline]
 __se_compat_sys_ioctl+0x57c/0xed0 fs/ioctl.c:798
 __ia32_compat_sys_ioctl+0x4a/0x70 fs/ioctl.c:798
 do_syscall_32_irqs_on arch/x86/entry/common.c:430 [inline]
 __do_fast_syscall_32+0x2aa/0x400 arch/x86/entry/common.c:477
 do_fast_syscall_32+0x6b/0xd0 arch/x86/entry/common.c:505
 do_SYSENTER_32+0x73/0x90 arch/x86/entry/common.c:554
 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c
RIP: 0023:0xf7f81549
Code: Bad RIP value.
RSP: 002b:00000000f5d7c0cc EFLAGS: 00000296 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 00000000c044565d
RDX: 0000000020000100 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000

Local variable ----vb32.i@video_usercopy created at:
 video_put_user drivers/media/v4l2-core/v4l2-ioctl.c:3210 [inline]
 video_usercopy+0x20bd/0x2c00 drivers/media/v4l2-core/v4l2-ioctl.c:3325
 video_put_user drivers/media/v4l2-core/v4l2-ioctl.c:3210 [inline]
 video_usercopy+0x20bd/0x2c00 drivers/media/v4l2-core/v4l2-ioctl.c:3325

Bytes 52-55 of 80 are uninitialized
Memory access of size 80 starts at ffffb50f818bb950
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