add check for empty cidr

This causes tcprewrite to exit with an error instead of crashing. Fixes: appneta#824 Signed-off-by: Gabriel Ganne <gabriel.ganne@gmail.com>
GabrielGanne · Jan 21, 2024 · a0b6d84 · a0b6d84
1 parent 43693c4
commit a0b6d84
Showing 1 changed file with 4 additions and 0 deletions.
diff --git a/src/common/cidr.c b/src/common/cidr.c
@@ -249,6 +249,10 @@ parse_cidr(tcpr_cidr_t **cidrdata, char *cidrin, char *delim)
     char *network;
     char *token = NULL;
 
+    if (cidrin == NULL) {
+        errx(-1, "%s", "Unable to parse empty CIDR");
+    }
+
     mask_cidr6(&cidrin, delim);
 
     /* first iteration of input using strtok */