utils: fix integer overflow (#3206)

Signed-off-by: davkor <[email protected]>
fluent · Mar 10, 2021 · 878c29c · 878c29c
1 parent b66339b
commit 878c29c
Showing 1 changed file with 4 additions and 0 deletions.
diff --git a/src/flb_utils.c b/src/flb_utils.c
@@ -453,6 +453,10 @@ int64_t flb_utils_hex2int(char *hex, int len)
     char c;
 
     while ((c = *hex++) && i < len) {
+        /* Ensure no overflow */
+        if (res >= 0xccccccccccccd00) {
+            return -1;
+        }
         res *= 0x10;
 
         if (c >= 'a' && c <= 'f') {