| Message ID | 1428026183-14879-14-git-send-email-ebiederm@xmission.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
diff --git a/fs/namespace.c b/fs/namespace.c index 1894d1878dbc..e8f7f8c58c3c 100644 --- a/fs/namespace.c +++ b/fs/namespace.c @@ -1516,7 +1516,7 @@ void __detach_mounts(struct dentry *dentry) namespace_lock(); mp = lookup_mountpoint(dentry); - if (!mp) + if (IS_ERR_OR_NULL(mp)) goto out_unlock; lock_mount_hash();
lookup_mountpoint can return either NULL or an error value. Update the test in __detach_mounts to test for an error value to avoid pathological cases causing a NULL pointer dereferences. The callers of __detach_mounts should prevent it from ever being called on an unlinked dentry but don't take any chances. Cc: stable@vger.kernel.org Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com> --- fs/namespace.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)