1 files changed, 2 insertions, 0 deletions
diff --git a/base64.c b/base64.c
index 8f0fb6c..26ca7d7 100644
--- a/base64.c
+++ b/base64.c
@@ -50,6 +50,8 @@ base64_encode(const void *data, int size, char **str)
     int c;
     const unsigned char *q;
 
+    if (size < 0)
+	return -1;
     p = s = (char *) malloc(size * 4 / 3 + 4);
     if (p == NULL)
 	return -1;