From: Lennart Poettering <lennart@poettering.net>
Date: Wed, 13 Apr 2022 14:25:32 +0000 (+0200)
Subject: devnum-util: catch potential stack overruns early
X-Git-Tag: v251-rc2~130^2
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=refs%2Fpull%2F23070%2Fhead;p=thirdparty%2Fsystemd.git

devnum-util: catch potential stack overruns early
---

diff --git a/src/basic/devnum-util.c b/src/basic/devnum-util.c
index e0ecf548839..70c07315c59 100644
--- a/src/basic/devnum-util.c
+++ b/src/basic/devnum-util.c
@@ -18,6 +18,8 @@ int parse_devnum(const char *s, dev_t *ret) {
         n = strspn(s, DIGITS);
         if (n == 0)
                 return -EINVAL;
+        if (n > DECIMAL_STR_MAX(dev_t))
+                return -EINVAL;
         if (s[n] != ':')
                 return -EINVAL;