codecparsers: h264parser: guard against ref_pic_markings overflow

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/1703>

diff --git a/gst-libs/gst/codecparsers/gsth264parser.c b/gst-libs/gst/codecparsers/gsth264parser.c
index 1c40b65..012f1d0 100644 (file)
--- 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)