dnsmasq: CVE-2019-14834

Backport the CVE patch from the upstream to fix the memory leak.

Signed-off-by: Zhixiong Chi <zhixiong.chi@windriver.com>
Signed-off-by: Khem Raj <raj.khem@gmail.com>

meta-networking/recipes-support/dnsmasq/dnsmasq/0001-dnsmasq-fix-memory-leak-in-helper-c.patch

@@ -0,0 +1,49 @@
+From 69bc94779c2f035a9fffdb5327a54c3aeca73ed5 Mon Sep 17 00:00:00 2001
+From: Simon Kelley <simon@thekelleys.org.uk>
+Date: Wed, 14 Aug 2019 20:44:50 +0100
+Subject: [PATCH] Fix memory leak in helper.c
+
+Thanks to Xu Mingjie <xumingjie1995@outlook.com> for spotting this.
+
+CVE: CVE-2019-14834
+Upstream-Status: Backport
+Signed-off-by: Zhixiong Chi <zhixiong.chi@windriver.com>
+---
+ src/helper.c |   12 +++++++++---
+ 1 file changed, 9 insertions(+), 3 deletions(-)
+
+diff --git a/src/helper.c b/src/helper.c
+index 33ba120..c392eec 100644
+--- a/src/helper.c
++++ b/src/helper.c
+@@ -82,7 +82,8 @@ int create_helper(int event_fd, int err_fd, uid_t uid, gid_t gid, long max_fd)
+   pid_t pid;
+   int i, pipefd[2];
+   struct sigaction sigact;
+-
++  unsigned char *alloc_buff = NULL;
++  
+   /* create the pipe through which the main program sends us commands,
+      then fork our process. */
+   if (pipe(pipefd) == -1 || !fix_fd(pipefd[1]) || (pid = fork()) == -1)
+@@ -188,11 +189,16 @@ int create_helper(int event_fd, int err_fd, uid_t uid, gid_t gid, long max_fd)
+       struct script_data data;
+       char *p, *action_str, *hostname = NULL, *domain = NULL;
+       unsigned char *buf = (unsigned char *)daemon->namebuff;
+-      unsigned char *end, *extradata, *alloc_buff = NULL;
++      unsigned char *end, *extradata;
+       int is6, err = 0;
+       int pipeout[2];
+ 
+-      free(alloc_buff);
++      /* Free rarely-allocated memory from previous iteration. */
++      if (alloc_buff)
++	{
++	  free(alloc_buff);
++	  alloc_buff = NULL;
++	}
+       
+       /* we read zero bytes when pipe closed: this is our signal to exit */ 
+       if (!read_write(pipefd[0], (unsigned char *)&data, sizeof(data), 1))
+-- 
+1.7.10.4

meta-networking/recipes-support/dnsmasq/dnsmasq_2.80.bb

@@ -5,5 +5,6 @@ SRC_URI[dnsmasq-2.80.sha256sum] = "9e4a58f816ce0033ce383c549b7d4058ad9b823968d35
 SRC_URI += "\
     file://lua.patch \
     file://0001-dnsmasq-fix-build-against-5.2-headers.patch \
+    file://0001-dnsmasq-fix-memory-leak-in-helper-c.patch \
 "