[PATCH] Fix bug in SELinux convert_context

From: Stephen Smalley <sds@epoch.ncsc.mil>

This patch fixes a bug introduced by earlier code cleanups in the SELinux
convert_context code that manifests upon a policy reload that removes
previously valid security attributes.  Thanks to Magosanyi Arpad for
reporting the bug.

security/selinux/ss/services.c

@@ -896,7 +896,7 @@ static int convert_context(u32 key,
 	struct user_datum *usrdatum;
 	char *s;
 	u32 len;
-	int rc = -EINVAL;
+	int rc;
 
 	args = p;
 
@@ -904,6 +904,8 @@ static int convert_context(u32 key,
 	if (rc)
 		goto out;
 
+	rc = -EINVAL;
+
 	/* Convert the user. */
 	usrdatum = hashtab_search(args->newp->p_users.table,
 	                          args->oldp->p_user_val_to_name[c->user - 1]);