Fix possible segfault if siglist was empty

If siglist->results wasn't a NULL pointer, we would try to free it
anyway, even if siglist->count was zero. Only attempt to free this
pointer if we had results and the pointer is valid.

Signed-off-by: Dan McGee <dan@archlinux.org>

1 files changed, 4 insertions, 1 deletions

diff --git a/lib/libalpm/signing.c b/lib/libalpm/signing.c
index e1b6452c..b090b6a9 100644
--- a/lib/libalpm/signing.c
+++ b/lib/libalpm/signing.c
@@ -615,7 +615,10 @@ int SYMEXPORT alpm_siglist_cleanup(alpm_siglist_t *siglist)
 			free(result->key.fingerprint);
 		}
 	}
-	FREE(siglist->results);
+	if(siglist->count) {
+		free(siglist->results);
+	}
+	siglist->results = NULL;
 	siglist->count = 0;
 	return 0;
 }