Merge pull request #239 from jslachta/pulseaudio

pulseaudio: fix CVE-2014-3970

sound/pulseaudio/Makefile

@@ -9,7 +9,7 @@ include $(TOPDIR)/rules.mk
 
 PKG_NAME:=pulseaudio
 PKG_VERSION:=5.0
-PKG_RELEASE:=1
+PKG_RELEASE:=2
 
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.xz
 PKG_SOURCE_URL:=http://freedesktop.org/software/pulseaudio/releases/

sound/pulseaudio/patches/002-rtp-recv-fix-crash-on-empty-UDP-packets-CVE-2014-3970.patch

@@ -0,0 +1,57 @@
+From 26b9d22dd24c17eb118d0205bf7b02b75d435e3c Mon Sep 17 00:00:00 2001
+From: "Alexander E. Patrakov" <patrakov@gmail.com>
+Date: Thu, 5 Jun 2014 22:29:25 +0600
+Subject: [PATCH] rtp-recv: fix crash on empty UDP packets (CVE-2014-3970)
+
+On FIONREAD returning 0 bytes, we cannot return success, as the caller
+(rtpoll_work_cb in module-rtp-recv.c) would then try to
+pa_memblock_unref(chunk.memblock) and, because memblock is NULL, trigger
+an assertion.
+
+Also we have to read out the possible empty packet from the socket, so
+that the kernel doesn't tell us again and again about it.
+
+Signed-off-by: Alexander E. Patrakov <patrakov@gmail.com>
+---
+ src/modules/rtp/rtp.c | 25 +++++++++++++++++++++++--
+ 1 file changed, 23 insertions(+), 2 deletions(-)
+
+diff --git a/src/modules/rtp/rtp.c b/src/modules/rtp/rtp.c
+index 570737e..7b75e0e 100644
+--- a/src/modules/rtp/rtp.c
++++ b/src/modules/rtp/rtp.c
+@@ -182,8 +182,29 @@ int pa_rtp_recv(pa_rtp_context *c, pa_memchunk *chunk, pa_mempool *pool, struct
+         goto fail;
+     }
+ 
+-    if (size <= 0)
+-        return 0;
++    if (size <= 0) {
++        /* size can be 0 due to any of the following reasons:
++         *
++         * 1. Somebody sent us a perfectly valid zero-length UDP packet.
++         * 2. Somebody sent us a UDP packet with a bad CRC.
++         *
++         * It is unknown whether size can actually be less than zero.
++         *
++         * In the first case, the packet has to be read out, otherwise the
++         * kernel will tell us again and again about it, thus preventing
++         * reception of any further packets. So let's just read it out
++         * now and discard it later, when comparing the number of bytes
++         * received (0) with the number of bytes wanted (1, see below).
++         *
++         * In the second case, recvmsg() will fail, thus allowing us to
++         * return the error.
++         *
++         * Just to avoid passing zero-sized memchunks and NULL pointers to
++         * recvmsg(), let's force allocation of at least one byte by setting
++         * size to 1.
++         */
++        size = 1;
++    }
+ 
+     if (c->memchunk.length < (unsigned) size) {
+         size_t l;
+-- 
+2.0.0
+