From 11353b3f6e2f047cc37483d21e6a37ae558896bc Mon Sep 17 00:00:00 2001
From: Andrew Wesie <andrew@theori.io>
Date: Fri, 16 Oct 2020 12:29:02 +0100
Subject: [PATCH] codecparsers: h264parser: guard against ref_pic_markings
 overflow

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/1703>
---
 gst-libs/gst/codecparsers/gsth264parser.c | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/gst-libs/gst/codecparsers/gsth264parser.c b/gst-libs/gst/codecparsers/gsth264parser.c
index 1c40b6517c..012f1d0d73 100644
--- a/gst-libs/gst/codecparsers/gsth264parser.c
+++ b/gst-libs/gst/codecparsers/gsth264parser.c
@@ -723,13 +723,17 @@ gst_h264_slice_parse_dec_ref_pic_marking (GstH264SliceHdr * slice,
 
       dec_ref_pic_m->n_ref_pic_marking = 0;
       while (1) {
-        refpicmarking =
-            &dec_ref_pic_m->ref_pic_marking[dec_ref_pic_m->n_ref_pic_marking];
-
         READ_UE (nr, mem_mgmt_ctrl_op);
         if (mem_mgmt_ctrl_op == 0)
           break;
 
+        if (dec_ref_pic_m->n_ref_pic_marking >=
+            G_N_ELEMENTS (dec_ref_pic_m->ref_pic_marking))
+          goto error;
+
+        refpicmarking =
+            &dec_ref_pic_m->ref_pic_marking[dec_ref_pic_m->n_ref_pic_marking];
+
         refpicmarking->memory_management_control_operation = mem_mgmt_ctrl_op;
 
         if (mem_mgmt_ctrl_op == 1 || mem_mgmt_ctrl_op == 3)