[PATCH] security_selinux: Fix crash in virSecuritySELinuxRestoreFileLabel

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when failed to boot a guest, virSecuritySELinuxRestoreFileLabel
will be called eventually to reset security label, which will
lead a crash if pass null to virFileResolveLink(path, &newpath).

https://bugzilla.redhat.com/show_bug.cgi?id=1300532
Signed-off-by: Shanzhi Yu <shyu@xxxxxxxxxx>
---
 src/security/security_selinux.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/security/security_selinux.c b/src/security/security_selinux.c
index 9e98635..c8a7553 100644
--- a/src/security/security_selinux.c
+++ b/src/security/security_selinux.c
@@ -1026,7 +1026,7 @@ virSecuritySELinuxRestoreFileLabel(virSecurityManagerPtr mgr,
 
     VIR_INFO("Restoring SELinux context on '%s'", path);
 
-    if (virFileResolveLink(path, &newpath) < 0) {
+    if (path && virFileResolveLink(path, &newpath) < 0) {
         VIR_WARN("cannot resolve symlink %s: %s", path,
                  virStrerror(errno, ebuf, sizeof(ebuf)));
         goto err;
-- 
1.8.3.1

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