[PATCH] gnu: qemu: Patch CVE-2016-8910.

[Kei Kebreau <kei@openmailbox.org>]

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One of the email address was hidden on the list I got this patch from.
I don't know whether that's a potential problem.
See:
http://www.openwall.com/lists/oss-security/2016/10/24/2 and
https://lists.gnu.org/archive/html/qemu-devel/2016-10/msg05495.html

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From 4bc4920a96481d5c1a5c7f42cf3ec573f5096d39 Mon Sep 17 00:00:00 2001
From: Kei Kebreau <kei@openmailbox.org>
Date: Tue, 25 Oct 2016 13:24:09 -0400
Subject: [PATCH] gnu: qemu: Patch CVE-2016-8910.

* gnu/packages/qemu.scm (qemu)[source]: Add patch.
* gnu/packages/patches/qemu-CVE-2016-8910.patch: New file.
* gnu/local.mk (dist_patch_DATA): Register it.
---
 gnu/local.mk                                  |  1 +
 gnu/packages/patches/qemu-CVE-2016-8910.patch | 28 +++++++++++++++++++++++++++
 gnu/packages/qemu.scm                         |  3 ++-
 3 files changed, 31 insertions(+), 1 deletion(-)
 create mode 100644 gnu/packages/patches/qemu-CVE-2016-8910.patch

diff --git a/gnu/local.mk b/gnu/local.mk
index ff2d976..5577b69 100644
--- a/gnu/local.mk
+++ b/gnu/local.mk
@@ -814,6 +814,7 @@ dist_patch_DATA =						\
   %D%/packages/patches/qemu-CVE-2016-8576.patch			\
   %D%/packages/patches/qemu-CVE-2016-8577.patch			\
   %D%/packages/patches/qemu-CVE-2016-8578.patch			\
+  %D%/packages/patches/qemu-CVE-2016-8910.patch			\
   %D%/packages/patches/qt4-ldflags.patch			\
   %D%/packages/patches/quickswitch-fix-dmenu-check.patch	\
   %D%/packages/patches/rapicorn-isnan.patch			\
diff --git a/gnu/packages/patches/qemu-CVE-2016-8910.patch b/gnu/packages/patches/qemu-CVE-2016-8910.patch
new file mode 100644
index 0000000..7a38b3c
--- /dev/null
+++ b/gnu/packages/patches/qemu-CVE-2016-8910.patch
@@ -0,0 +1,28 @@
+From: Prasad J Pandit <ppandit@redhat.com>
+
+RTL8139 ethernet controller in C+ mode supports multiple
+descriptor rings, each with maximum of 64 descriptors. While
+processing transmit descriptor ring in 'rtl8139_cplus_transmit',
+it does not limit the descriptor count and runs forever. Add
+check to avoid it.
+
+Reported-by: Andrew Henderson <address@hidden>
+Signed-off-by: Prasad J Pandit <ppandit@redhat.com>
+---
+  hw/net/rtl8139.c | 2 +-
+  1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/hw/net/rtl8139.c b/hw/net/rtl8139.c
+index 3345bc6..f05e59c 100644
+--- a/hw/net/rtl8139.c
++++ b/hw/net/rtl8139.c
+@@ -2350,7 +2350,7 @@ static void rtl8139_cplus_transmit(RTL8139State *s)
+  {
+      int txcount = 0;
+    - while (rtl8139_cplus_transmit_one(s)) 
+
++    while (txcount < 64 && rtl8139_cplus_transmit_one(s))
+      {
+          ++txcount;
+      }
+
diff --git a/gnu/packages/qemu.scm b/gnu/packages/qemu.scm
index 9bf8c3a..a386426 100644
--- a/gnu/packages/qemu.scm
+++ b/gnu/packages/qemu.scm
@@ -79,7 +79,8 @@
                "0lqyz01z90nvxpc3nx4djbci7hx62cwvs5zwd6phssds0sap6vij"))
              (patches (search-patches "qemu-CVE-2016-8576.patch"
                                       "qemu-CVE-2016-8577.patch"
-                                      "qemu-CVE-2016-8578.patch"))))
+                                      "qemu-CVE-2016-8578.patch"
+                                      "qemu-CVE-2016-8910.patch"))))
     (build-system gnu-build-system)
     (arguments
      '(;; Running tests in parallel can occasionally lead to failures, like:
-- 
2.10.1


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