From 355c95b271f98a11ba105ae6f66d5d42c4767099 Mon Sep 17 00:00:00 2001
From: Tobias Frost <tobi@debian.org>
Date: Mon, 12 Dec 2022 14:03:12 +0100
Subject: [PATCH] [PATCH] Try to mitigate asan failures.
MIME-Version: 1.0
Content-Type: text/plain; charset=utf8
Content-Transfer-Encoding: 8bit

See #345 for my analysis and details…

(This PR is just for discussion.)

(The CVE references are obtained from the Debian security tracker,
which links the issues.)

This makes the following POCs stop failing:

- poc3 (#337)
- poc7-1 (#341) CVE-2022-43239 (note: does NOT fix poc7-2)
- poc8-2, poc8-3, poc8-4 (#342) CVE-2022-43244   (note: does NOT fix poc8-1)
- poc11-1, poc11-2 (#345) CVE-2022-43249
- poc12 (#346)
- poc13 (#347) CVE-2022-43252
- poc16 (#350)

Gbp-Pq: Name reject_reference_pics_from_different_sps.patch
---
 libde265/motion.cc | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/libde265/motion.cc b/libde265/motion.cc
index 45d547b..b7d7abc 100644
--- a/libde265/motion.cc
+++ b/libde265/motion.cc
@@ -361,6 +361,16 @@ void generate_inter_prediction_samples(base_context* ctx,
 
       logtrace(LogMotion, "refIdx: %d -> dpb[%d]\n", vi->refIdx[l], shdr->RefPicList[l][vi->refIdx[l]]);
 
+      if (refPic) {
+          auto nonconst_refPic = const_cast<de265_image*>(refPic); /* shared_ptr.get() chokes on const.*/
+          auto refsps = nonconst_refPic->get_shared_sps().get();
+          auto imgsps = img->get_shared_sps().get();
+          if(refsps != imgsps) {
+              // rejecting reference image created with different sps.
+              refPic = nullptr;
+          }
+      }
+
       if (!refPic || refPic->PicState == UnusedForReference) {
         img->integrity = INTEGRITY_DECODING_ERRORS;
         ctx->add_warning(DE265_WARNING_NONEXISTING_REFERENCE_PICTURE_ACCESSED, false);
-- 
2.30.2