info: protect stripTrailingSlashes against invalid input and zero length

Signed-off-by: Ferry Huberts <ferry.huberts@pelagic.nl>

diff --git a/lib/info/olsrd_info.c b/lib/info/olsrd_info.c
index fc1597a..e956866 100644 (file)
--- a/lib/info/olsrd_info.c
+++ b/lib/info/olsrd_info.c
@@ -606,6 +606,10 @@ static char * stripEOLs(char * requ, size_t *len) {
 }
 
 static char * stripTrailingSlashes(char * requ, size_t *len) {
+  if (!requ || !len || !*len) {
+    return requ;
+  }
+
   while ((requ[*len - 1] == '/') && (requ[*len - 1] != '\0')) {
     *len = *len - 1;
     requ[*len] = '\0';