main/strings: Fix uninitialized value.

ast_strings_match uses sscanf and checks for non-zero return to verify a
token was parsed. This is incorrect as sscanf returns EOF (-1) for errors.

ASTERISK-27318 #close

Change-Id: Ifcece92605f58116eff24c5a0a3b0ee08b3c87b1

diff --git a/main/strings.c b/main/strings.c
index 19aa2d373bdeb803b911fffa403cd58a15f5e4f9..3a333239c2cf3292e087132cdcc44b37cac49b69 100644 (file)
--- a/main/strings.c
+++ b/main/strings.c
@@ -314,7 +314,7 @@ regex:
        }
 
 equals:
-       scan_numeric = (sscanf(left, "%lf", &left_num) && sscanf(internal_right, "%lf", &right_num));
+       scan_numeric = (sscanf(left, "%lf", &left_num) > 0 && sscanf(internal_right, "%lf", &right_num) > 0);
 
        if (internal_op[0] == '=') {
                if (ast_strlen_zero(left) && ast_strlen_zero(internal_right)) {