syzkaller vnd ioctl unlock

[Alexander Bluhm]

Hi,

syzkaller found a missing unlock in vnd ioctl error path.

https://syzkaller.appspot.com/bug?id=b35a411a91f835fffb793df63aa8bcd7be99ad87

ok?

bluhm

Index: dev/vnd.c
===================================================================
RCS file: /data/mirror/openbsd/cvs/src/sys/dev/vnd.c,v
retrieving revision 1.176
diff -u -p -r1.176 vnd.c
--- dev/vnd.c   21 Dec 2021 06:12:03 -0000      1.176
+++ dev/vnd.c   22 Dec 2021 22:46:29 -0000
@@ -498,6 +498,7 @@ fail:
                if ((error = disk_lock(&sc->sc_dk)) != 0)
                        goto fail;
                if (sc->sc_flags & VNF_INITED) {
+                       disk_unlock(&sc->sc_dk);
                        error = EBUSY;
                        goto fail;
                }