dhcp: add upstream security fix

Fixes socket leak that might cause denial of serivce.

https://bugzilla.redhat.com/show_bug.cgi?id=1523547

Signed-off-by: Baruch Siach <baruch@tkos.co.il>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

diff --git a/package/dhcp/0002-v4_3-Plugs-a-socket-descriptor-leak-in-OMAPI.patch b/package/dhcp/0002-v4_3-Plugs-a-socket-descriptor-leak-in-OMAPI.patch
new file mode 100644 (file)
index 0000000..df29465
--- /dev/null
+++ b/package/dhcp/0002-v4_3-Plugs-a-socket-descriptor-leak-in-OMAPI.patch
@@ -0,0 +1,51 @@
+From 5097bc0559f592683faac1f67bf350e1bddf6ed4 Mon Sep 17 00:00:00 2001
+From: Thomas Markwalder <tmark@isc.org>
+Date: Thu, 7 Dec 2017 11:39:30 -0500
+Subject: [PATCH] [v4_3] Plugs a socket descriptor leak in OMAPI
+
+        Merges in rt46767.
+
+[baruch: drop RELNOTES hunk]
+Signed-off-by: Baruch Siach <baruch@tkos.co.il>
+---
+Patch status: upstream commit 5097bc0559f
+
+ omapip/buffer.c  | 9 +++++++++
+ omapip/message.c | 2 +-
+
+diff --git a/omapip/buffer.c b/omapip/buffer.c
+index f7fdc3250e82..809034d1317b 100644
+--- a/omapip/buffer.c
++++ b/omapip/buffer.c
+@@ -566,6 +566,15 @@ isc_result_t omapi_connection_writer (omapi_object_t *h)
+                       omapi_buffer_dereference (&buffer, MDL);
+               }
+       }
++
++      /* If we had data left to write when we're told to disconnect,
++      * we need recall disconnect, now that we're done writing.
++      * See rt46767. */
++      if (c->out_bytes == 0 && c->state == omapi_connection_disconnecting) {
++              omapi_disconnect (h, 1);
++              return ISC_R_SHUTTINGDOWN;
++      }
++
+       return ISC_R_SUCCESS;
+ }
+ 
+diff --git a/omapip/message.c b/omapip/message.c
+index 59ccdc2c05cf..21bcfc3822e7 100644
+--- a/omapip/message.c
++++ b/omapip/message.c
+@@ -339,7 +339,7 @@ isc_result_t omapi_message_unregister (omapi_object_t *mo)
+ }
+ 
+ #ifdef DEBUG_PROTOCOL
+-static const char *omapi_message_op_name(int op) {
++const char *omapi_message_op_name(int op) {
+       switch (op) {
+       case OMAPI_OP_OPEN:    return "OMAPI_OP_OPEN";
+       case OMAPI_OP_REFRESH: return "OMAPI_OP_REFRESH";
+-- 
+2.15.1
+