From: Paul Fox <pgf@brightstareng.com>
Date: Thu, 8 Nov 2007 01:12:38 +0000 (-0000)
Subject: follow symlinks to find the true passwd file before updating.
X-Git-Tag: 1_9_0~128
X-Git-Url: https://git.librecmc.org/?a=commitdiff_plain;h=53bd4015aa7ec79b8f45edd30555ea7b7235d7ca;p=oweals%2Fbusybox.git

follow symlinks to find the true passwd file before updating.
---

diff --git a/libbb/update_passwd.c b/libbb/update_passwd.c
index 388adf81f..e99db40c0 100644
--- a/libbb/update_passwd.c
+++ b/libbb/update_passwd.c
@@ -52,6 +52,10 @@ int update_passwd(const char *filename, const char *username,
 	int cnt = 0;
 	int ret = -1; /* failure */
 
+	filename = xmalloc_readlink_follow(filename);
+	if (filename == NULL)
+		return -1;
+
 	check_selinux_update_passwd(username);
 
 	/* New passwd file, "/etc/passwd+" for now */
@@ -143,6 +147,7 @@ int update_passwd(const char *filename, const char *username,
 
  free_mem:
 	free(fnamesfx);
-	free((char*)username);
+	free((char *)filename);
+	free((char *)username);
 	return ret;
 }