WARNING: lock held when returning to user space in sock

WARNING: lock held when returning to user space in sock_setsockopt
Status: internal: reported on 2021/07/06 02:30
Reported-by: syzbot+@syzkaller.appspotmail.com
Fix commit: 271dbc318432 sock: unlock on error in sock_setsockopt()
Patched on: [ci-qemu-upstream ci-qemu-upstream-386 ci-qemu2-arm64 ci-qemu2-arm64-compat ci-qemu2-arm64-mte ci-qemu2-riscv64 ci-upstream-bpf-kasan-gce ci-upstream-bpf-next-kasan-gce ci-upstream-gce-leak ci-upstream-kasan-gce ci-upstream-kasan-gce-386 ci-upstream-kasan-gce-root ci-upstream-kasan-gce-selinux-root ci-upstream-kasan-gce-smack-root ci-upstream-linux-next-kasan-gce-root ci-upstream-net-kasan-gce ci-upstream-net-this-kasan-gce ci2-upstream-kcsan-gce ci2-upstream-usb], missing on: [ci-qemu2-arm32 ci-upstream-kmsan-gce ci-upstream-kmsan-gce-386]
First crash: 73d, last: 73d

Sample crash report:

================================================
WARNING: lock held when returning to user space!
5.13.0-syzkaller #0 Not tainted
------------------------------------------------
syz-executor.5/24852 is leaving the kernel with locks still held!
1 lock held by syz-executor.5/24852:
 #0: ffff88807f934220 (sk_lock-AF_TIPC){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1613 [inline]
 #0: ffff88807f934220 (sk_lock-AF_TIPC){+.+.}-{0:0}, at: sock_setsockopt+0x1e3/0x2490 net/core/sock.c:980

Crashes (1):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro	VM info	Title
ci-upstream-net-this-kasan-gce	2021/07/06 02:29	net	c6c205ed442e	55aa55c2	.config	log	report			info	WARNING: lock held when returning to user space in sock_setsockopt