ext/sockets: socket_strerror follow-up on phpGH-16267 fix.

boundaries should be INT_MIN <= val < INT_MAX in fact.

close phpGH-16891

Author: devnexen

NEWS

@@ -14,6 +14,10 @@ PHP                                                                        NEWS
 - SimpleXML:
   . Fixed bug GH-17040 (SimpleXML's unset can break DOM objects). (nielsdos)
 
+- Sockets:
+  . Fixed bug GH-16276 (socket_strerror overflow handling with INT_MIN).
+    (David Carlier / cmb)
+
 - Streams:
   . Fixed bug GH-17037 (UAF in user filter when adding existing filter name due
     to incorrect error handling). (nielsdos)

ext/sockets/sockets.c

@@ -354,7 +354,11 @@ char *sockets_strerror(int error) /* {{{ */
 
 #ifndef PHP_WIN32
 	if (error < -10000) {
-		error = -error - 10000;
+		if (error == INT_MIN) {
+			error = 2147473648;
+		} else {
+			error = -error - 10000;
+		}
 
 #ifdef HAVE_HSTRERROR
 		buf = hstrerror(error);

ext/sockets/tests/gh16267.phpt

@@ -3,20 +3,16 @@ GH-16267 - overflow on socket_strerror argument
 --EXTENSIONS--
 sockets
 --SKIPIF--
-<?php if (PHP_INT_SIZE != 8) die('skip 64-bit only'); ?>
+<?php if (PHP_INT_SIZE != 8) die("skip this test is for 64bit platform only"); ?>
 --FILE--
 <?php
+var_dump(socket_strerror(-2147483648));
 try {
-	socket_strerror(PHP_INT_MIN);
-} catch (\ValueError $e) {
-	echo $e->getMessage() . PHP_EOL;
-}
-try {
-	socket_strerror(PHP_INT_MAX);
+	socket_strerror(2147483648);
 } catch (\ValueError $e) {
 	echo $e->getMessage() . PHP_EOL;
 }
 ?>
 --EXPECTF--
-socket_strerror(): Argument #1 ($error_code) must be between %s and %s
-socket_strerror(): Argument #1 ($error_code) must be between %s and %s
+string(%d) "%S"
+socket_strerror(): Argument #1 ($error_code) must be between %i and %d