memory leak in video_usercopy

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit:    a409ed15 Merge tag 'gpio-v5.11-1' of git://git.kernel.org/..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=10a5880f500000
kernel config:  https://syzkaller.appspot.com/x/.config?x=37c889fb8b2761af
dashboard link: https://syzkaller.appspot.com/bug?extid=1115e79c8df6472c612b
compiler:       gcc (GCC) 10.1.0-syz 20200507
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=14d18f9b500000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=106a2c13500000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+1115e79c8df6472c612b@xxxxxxxxxxxxxxxxxxxxxxxxx

Debian GNU/Linux 9 syzkaller ttyS0
Warning: Permanently added '10.128.10.29' (ECDSA) to the list of known hosts.
executing program
executing program
BUG: memory leak
unreferenced object 0xffff88810fb12300 (size 256):
  comm "syz-executor399", pid 8472, jiffies 4294942333 (age 13.960s)
  hex dump (first 32 bytes):
    03 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
  backtrace:
    [<000000009fd00995>] kmalloc_node include/linux/slab.h:575 [inline]
    [<000000009fd00995>] kvmalloc_node+0x61/0xf0 mm/util.c:575
    [<0000000096a57c4a>] kvmalloc include/linux/mm.h:773 [inline]
    [<0000000096a57c4a>] video_usercopy+0x991/0xa50 drivers/media/v4l2-core/v4l2-ioctl.c:3303
    [<00000000f7529cc2>] v4l2_ioctl+0x77/0x90 drivers/media/v4l2-core/v4l2-dev.c:360
    [<0000000061b5e6a9>] vfs_ioctl fs/ioctl.c:48 [inline]
    [<0000000061b5e6a9>] __do_sys_ioctl fs/ioctl.c:753 [inline]
    [<0000000061b5e6a9>] __se_sys_ioctl fs/ioctl.c:739 [inline]
    [<0000000061b5e6a9>] __x64_sys_ioctl+0xfc/0x140 fs/ioctl.c:739
    [<000000000139479b>] do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
    [<00000000d6de1c9c>] entry_SYSCALL_64_after_hwframe+0x44/0xa9

BUG: memory leak
unreferenced object 0xffff88810f934300 (size 256):
  comm "syz-executor399", pid 8473, jiffies 4294942927 (age 8.030s)
  hex dump (first 32 bytes):
    03 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
  backtrace:
    [<000000009fd00995>] kmalloc_node include/linux/slab.h:575 [inline]
    [<000000009fd00995>] kvmalloc_node+0x61/0xf0 mm/util.c:575
    [<0000000096a57c4a>] kvmalloc include/linux/mm.h:773 [inline]
    [<0000000096a57c4a>] video_usercopy+0x991/0xa50 drivers/media/v4l2-core/v4l2-ioctl.c:3303
    [<00000000f7529cc2>] v4l2_ioctl+0x77/0x90 drivers/media/v4l2-core/v4l2-dev.c:360
    [<0000000061b5e6a9>] vfs_ioctl fs/ioctl.c:48 [inline]
    [<0000000061b5e6a9>] __do_sys_ioctl fs/ioctl.c:753 [inline]
    [<0000000061b5e6a9>] __se_sys_ioctl fs/ioctl.c:739 [inline]
    [<0000000061b5e6a9>] __x64_sys_ioctl+0xfc/0x140 fs/ioctl.c:739
    [<000000000139479b>] do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
    [<00000000d6de1c9c>] entry_SYSCALL_64_after_hwframe+0x44/0xa9



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