rabbitmq-c: add CVE-2019-18609 patch

Signed-off-by: Nathan Owens <ndowens04@gmail.com>

srcpkgs/rabbitmq-c/patches/CVE-2019-18609.patch

@@ -0,0 +1,47 @@
+From fc85be7123050b91b054e45b91c78d3241a5047a Mon Sep 17 00:00:00 2001
+From: Alan Antonuk <alan.antonuk@gmail.com>
+Date: Sun, 3 Nov 2019 23:50:07 -0800
+Subject: [PATCH] lib: check frame_size is >= INT32_MAX
+
+When parsing a frame header, validate that the frame_size is less than
+or equal to INT32_MAX. Given frame_max is limited between 0 and
+INT32_MAX in amqp_login and friends, this does not change the API.
+
+This prevents a potential buffer overflow when a malicious client sends
+a frame_size that is close to UINT32_MAX, in which causes an overflow
+when computing state->target_size resulting in a small value there. A
+buffer is then allocated with the small amount, then memcopy copies the
+frame_size writing to memory beyond the end of the buffer.
+---
+ librabbitmq/amqp_connection.c | 15 ++++++++++++---
+ 1 file changed, 12 insertions(+), 3 deletions(-)
+
+diff --git librabbitmq/amqp_connection.c librabbitmq/amqp_connection.c
+index 034b2e96..b106f70a 100644
+--- librabbitmq/amqp_connection.c
++++ librabbitmq/amqp_connection.c
+@@ -287,12 +287,21 @@ int amqp_handle_input(amqp_connection_state_t state, amqp_bytes_t received_data,
+     case CONNECTION_STATE_HEADER: {
+       amqp_channel_t channel;
+       amqp_pool_t *channel_pool;
+-      /* frame length is 3 bytes in */
++      uint32_t frame_size;
++
+       channel = amqp_d16(amqp_offset(raw_frame, 1));
+ 
+-      state->target_size =
+-          amqp_d32(amqp_offset(raw_frame, 3)) + HEADER_SIZE + FOOTER_SIZE;
++      /* frame length is 3 bytes in */
++      frame_size = amqp_d32(amqp_offset(raw_frame, 3));
++      /* To prevent the target_size calculation below from overflowing, check
++       * that the stated frame_size is smaller than a signed 32-bit. Given
++       * the library only allows configuring frame_max as an int32_t, and
++       * frame_size is uint32_t, the math below is safe from overflow. */
++      if (frame_size >= INT32_MAX) {
++        return AMQP_STATUS_BAD_AMQP_DATA;
++      }
+ 
++      state->target_size = frame_size + HEADER_SIZE + FOOTER_SIZE;
+       if ((size_t)state->frame_max < state->target_size) {
+         return AMQP_STATUS_BAD_AMQP_DATA;
+       }

srcpkgs/rabbitmq-c/template

@@ -1,7 +1,7 @@
 # Template file for 'rabbitmq-c'
 pkgname=rabbitmq-c
 version=0.9.0
-revision=1
+revision=2
 build_style=cmake
 hostmakedepends="popt xmlto doxygen"
 makedepends="libressl-devel"