From: Lénaïc Huard <lenaic@lhuard.fr>
Date: Wed, 1 Apr 2020 21:45:08 +0000 (+0200)
Subject: udev: Fix SIGSEGV in AlternativeNamesPolicy handling
X-Git-Tag: v246-rc1~664
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=61fd7d6720c562c88ab79062ff8d131e5e3c7b1b;p=thirdparty%2Fsystemd.git

udev: Fix SIGSEGV in AlternativeNamesPolicy handling

The function sd_device_get_property_value has some paths where it exits without
touching the n pointer. In those cases, n remained uninitialized until it was
eventually read inside isempty where it caused the segmentation fault.

Fixes #15078
---

diff --git a/src/udev/net/link-config.c b/src/udev/net/link-config.c
index 71946c9ecc7..48039511fa6 100644
--- a/src/udev/net/link-config.c
+++ b/src/udev/net/link-config.c
@@ -498,7 +498,7 @@ int link_config_apply(link_config_ctx *ctx, link_config *config,
 
         if (config->alternative_names_policy)
                 for (NamePolicy *p = config->alternative_names_policy; *p != _NAMEPOLICY_INVALID; p++) {
-                        const char *n;
+                        const char *n = NULL;
 
                         switch (*p) {
                         case NAMEPOLICY_DATABASE: