Fixed bug #80457

On x32 sizeof(size_t) != sizeof(zend_long), so we need to be
careful with sign extension here.

Patch by bruno dot premont at restena dot lu.

Author: nikic

NEWS

@@ -2,6 +2,9 @@ PHP                                                                        NEWS
 |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
 ?? ??? ????, PHP 7.3.26
 
+- Standard:
+  . Fixed bug #80457 (stream_get_contents() fails with maxlength=-1 or default).
+    (bruno dot premont at restena dot lu)
 
 26 Nov 2020, PHP 7.3.25
 

ext/standard/streamsfuncs.c

@@ -442,7 +442,7 @@ PHP_FUNCTION(stream_get_contents)
 		Z_PARAM_LONG(desiredpos)
 	ZEND_PARSE_PARAMETERS_END_EX(RETURN_FALSE);
 
-	if (maxlen < 0 && maxlen != PHP_STREAM_COPY_ALL) {
+	if (maxlen < 0 && maxlen != (ssize_t)PHP_STREAM_COPY_ALL) {
 		php_error_docref(NULL, E_WARNING, "Length must be greater than or equal to zero, or -1");
 		RETURN_FALSE;
 	}