[Buildroot] [git commit] libupnp: add upstream security fix for CVE-2016-8863

[Thomas Petazzoni]

commit: https://git.buildroot.net/buildroot/commit/?id=c489cbad775380b4c7586574e3dae8dc67ee9087
branch: https://git.buildroot.net/buildroot/commit/?id=refs/heads/master

Fix out-of-bound access in create_url_list()

If there is an invalid URL in URLS->buf after a valid one, uri_parse is
called with out pointing after the allocated memory. As uri_parse writes
to *out before returning an error the loop in create_url_list must be
stopped early to prevent an out-of-bound access.

Signed-off-by: Peter Korsgaard <peter at korsgaard.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni at free-electrons.com>
---
 ...bound-access-in-create_url_list-CVE-2016-.patch | 64 ++++++++++++++++++++++
 1 file changed, 64 insertions(+)

diff --git a/package/libupnp/0002-Fix-out-of-bound-access-in-create_url_list-CVE-2016-.patch b/package/libupnp/0002-Fix-out-of-bound-access-in-create_url_list-CVE-2016-.patch
new file mode 100644
index 0000000..1b74d3e
--- /dev/null
+++ b/package/libupnp/0002-Fix-out-of-bound-access-in-create_url_list-CVE-2016-.patch
@@ -0,0 +1,64 @@
+From 9c099c2923ab4d98530ab5204af1738be5bddba7 Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Uwe=20Kleine-K=C3=B6nig?= <ukleinek at debian.org>
+Date: Thu, 8 Dec 2016 17:11:53 +0100
+Subject: [PATCH] Fix out-of-bound access in create_url_list() (CVE-2016-8863)
+
+If there is an invalid URL in URLS->buf after a valid one, uri_parse is
+called with out pointing after the allocated memory. As uri_parse writes
+to *out before returning an error the loop in create_url_list must be
+stopped early to prevent an out-of-bound access
+
+Bug: https://sourceforge.net/p/pupnp/bugs/133/
+Bug-CVE: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-8863
+Bug-Debian: https://bugs.debian.org/842093
+Bug-Redhat: https://bugzilla.redhat.com/show_bug.cgi?id=1388771
+(cherry picked from commit a0f6e719bc03c4d2fe6a4a42ef6b8761446f520b)
+Signed-off-by: Peter Korsgaard <peter at korsgaard.com>
+---
+ upnp/src/gena/gena_device.c | 17 ++++++++++++-----
+ 1 file changed, 12 insertions(+), 5 deletions(-)
+
+diff --git a/upnp/src/gena/gena_device.c b/upnp/src/gena/gena_device.c
+index fb04a29..245c56b 100644
+--- a/upnp/src/gena/gena_device.c
++++ b/upnp/src/gena/gena_device.c
+@@ -1113,7 +1113,7 @@ static int create_url_list(
+ 	/*! [out] . */
+ 	URL_list *out)
+ {
+-    size_t URLcount = 0;
++    size_t URLcount = 0, URLcount2 = 0;
+     size_t i;
+     int return_code = 0;
+     uri_type temp;
+@@ -1155,16 +1155,23 @@ static int create_url_list(
+         }
+         memcpy( out->URLs, URLS->buff, URLS->size );
+         out->URLs[URLS->size] = 0;
+-        URLcount = 0;
+         for( i = 0; i < URLS->size; i++ ) {
+             if( ( URLS->buff[i] == '<' ) && ( i + 1 < URLS->size ) ) {
+                 if( ( ( return_code =
+                         parse_uri( &out->URLs[i + 1], URLS->size - i + 1,
+-                                   &out->parsedURLs[URLcount] ) ) ==
++                                   &out->parsedURLs[URLcount2] ) ) ==
+                       HTTP_SUCCESS )
+-                    && ( out->parsedURLs[URLcount].hostport.text.size !=
++                    && ( out->parsedURLs[URLcount2].hostport.text.size !=
+                          0 ) ) {
+-                    URLcount++;
++                    URLcount2++;
++                    if (URLcount2 >= URLcount)
++                        /*
++                         * break early here in case there is a bogus URL that
++                         * was skipped above. This prevents to access
++                         * out->parsedURLs[URLcount] which is beyond the
++                         * allocation.
++                         */
++                        break;
+                 } else {
+                     if( return_code == UPNP_E_OUTOF_MEMORY ) {
+                         free( out->URLs );
+-- 
+2.10.2
+