fix MOPB#14

# The error message seems wrong, so maybe better fix is needed

diff --git a/ext/standard/string.c b/ext/standard/string.c
index ffd47155206acbc12c7829e4b283fd3bd69badf3..97fe4612c384eb20bb63052c2d1fb89632361696 100644 (file)
--- a/ext/standard/string.c
+++ b/ext/standard/string.c
@@ -5074,7 +5074,7 @@ PHP_FUNCTION(substr_compare)
                offset = (offset < 0) ? 0 : offset;
        }
 
-       if ((offset + len) > s1_len) {
+       if ((offset + len) > s1_len || (offset+len) < 0) {
                php_error_docref(NULL TSRMLS_CC, E_WARNING, "The start position cannot exceed initial string length");
                RETURN_FALSE;
        }