scanner: prevent overflow in add_action()

diff --git a/src/misc.c b/src/misc.c
index fa33a5bc6b6dd4981bc4fde042bc8732002f2374..745e6a8f30f9bac88b11f28e84caebbfc950db49 100644 (file)
--- a/src/misc.c
+++ b/src/misc.c
@@ -116,15 +116,14 @@ void add_action (const char *new_text)
        int     len = (int) strlen (new_text);
 
        while (len + action_index >= action_size - 10 /* slop */ ) {
-               int     new_size = action_size * 2;
 
-               if (new_size <= 0)
+               if (action_size > INT_MAX / 2)
                        /* Increase just a little, to try to avoid overflow
                         * on 16-bit machines.
                         */
                        action_size += action_size / 8;
                else
-                       action_size = new_size;
+                       action_size = action_size * 2;
 
                action_array =
                        reallocate_character_array (action_array,