From: Lennart Poettering <lennart@poettering.net>
Date: Wed, 20 Mar 2019 09:30:31 +0000 (+0100)
Subject: alloc-util: extra paranoid overflow check
X-Git-Tag: v242-rc1~103^2~4
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=e5e21a05076e60fe46eab4eb040735250ae3b814;p=thirdparty%2Fsystemd.git

alloc-util: extra paranoid overflow check
---

diff --git a/src/basic/alloc-util.c b/src/basic/alloc-util.c
index b28fb95ccfd..15b67665d26 100644
--- a/src/basic/alloc-util.c
+++ b/src/basic/alloc-util.c
@@ -27,6 +27,9 @@ void* memdup_suffix0(const void *p, size_t l) {
 
         /* The same as memdup() but place a safety NUL byte after the allocated memory */
 
+        if (_unlikely_(l == SIZE_MAX)) /* prevent overflow */
+                return NULL;
+
         ret = malloc(l + 1);
         if (!ret)
                 return NULL;