mnt: Fix the error check in __detach_mounts
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>
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@ -1516,7 +1516,7 @@ void __detach_mounts(struct dentry *dentry)
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namespace_lock();
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mp = lookup_mountpoint(dentry);
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if (!mp)
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if (IS_ERR_OR_NULL(mp))
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goto out_unlock;
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lock_mount_hash();
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