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BUG: KASAN: null-ptr-deref in atomic_fetch_sub include/asm-generic/atomic-instrumented.h:199 [inline]
BUG: KASAN: null-ptr-deref in refcount_sub_and_test include/linux/refcount.h:266 [inline]
BUG: KASAN: null-ptr-deref in refcount_dec_and_test include/linux/refcount.h:294 [inline]
BUG: KASAN: null-ptr-deref in kref_put include/linux/kref.h:64 [inline]
BUG: KASAN: null-ptr-deref in media_request_put+0x16/0x110 drivers/media/mc/mc-request.c:81
Write of size 4 at addr 0000000000000008 by task syz-executor.5/8473

CPU: 1 PID: 8473 Comm: syz-executor.5 Not tainted 5.7.0-rc1-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+0x128/0x182 lib/dump_stack.c:118
 __kasan_report.cold.11+0x5/0x4d mm/kasan/report.c:515
 kasan_report+0x32/0x50 mm/kasan/common.c:625
 check_memory_region_inline mm/kasan/generic.c:187 [inline]
 check_memory_region+0x1c1/0x1e0 mm/kasan/generic.c:193
 atomic_fetch_sub include/asm-generic/atomic-instrumented.h:199 [inline]
 refcount_sub_and_test include/linux/refcount.h:266 [inline]
 refcount_dec_and_test include/linux/refcount.h:294 [inline]
 kref_put include/linux/kref.h:64 [inline]
 media_request_put+0x16/0x110 drivers/media/mc/mc-request.c:81
 media_request_close+0x2e/0x50 drivers/media/mc/mc-request.c:89
 __fput+0x2a4/0x7a0 fs/file_table.c:280
 task_work_run+0xc2/0x160 kernel/task_work.c:123
 get_signal+0x16eb/0x1d40 kernel/signal.c:2533
 do_signal+0x81/0x2360 arch/x86/kernel/signal.c:784
 exit_to_usermode_loop+0x10f/0x2d0 arch/x86/entry/common.c:161
 prepare_exit_to_usermode arch/x86/entry/common.c:196 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:279 [inline]
 do_syscall_64+0x52a/0x620 arch/x86/entry/common.c:305
 entry_SYSCALL_64_after_hwframe+0x49/0xb3
RIP: 0033:0x45ca59
Code: 0d b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 db b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f092cbd5c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: fffffffffffffff4 RBX: 00000000004e9360 RCX: 000000000045ca59
RDX: 0000000000000000 RSI: 0000000080047c05 RDI: 0000000000000003
RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000004
R13: 0000000000000404 R14: 00000000004c6c0b R15: 00007f092cbd66d4
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