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vfs: fix braino resulting in NULL pointer deref in r352424

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The breakage was added after all the testing and the testing which followed
was not sufficient to find it.

Reported by:	pho
Sponsored by:	The FreeBSD Foundation
This commit is contained in:
Mateusz Guzik 2019-09-17 08:09:39 +00:00
parent 9d45af5c09
commit 7f65185940
1 changed files with 5 additions and 3 deletions
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8
sys/kern/vfs_default.c
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@ -613,11 +613,13 @@ vop_stdgetwritemount(ap)
vfs_op_thread_exit(mp);
} else {
MNT_ILOCK(mp);
if (mp == vp->v_mount)
if (mp == vp->v_mount) {
MNT_REF(mp);
else
MNT_IUNLOCK(mp);
} else {
MNT_IUNLOCK(mp);
mp = NULL;
MNT_IUNLOCK(mp);
}
}
*(ap->a_mpp) = mp;
return (0);