[FFmpeg-devel] [PATCH] avcodec/av1_metadata: don't store the inserted TD OBU in stack

[James Almer]

Fixes: stack-use-after-return
Fixes: clusterfuzz-testcase-minimized-ffmpeg_BSF_AV1_METADATA_fuzzer-5931515701755904
Fixes: clusterfuzz-testcase-minimized-ffmpeg_BSF_AV1_METADATA_fuzzer-6105676541722624

Signed-off-by: James Almer <jamrial at gmail.com>
---
 libavcodec/av1_metadata_bsf.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/libavcodec/av1_metadata_bsf.c b/libavcodec/av1_metadata_bsf.c
index 328db5c0da..b1ae364431 100644
--- a/libavcodec/av1_metadata_bsf.c
+++ b/libavcodec/av1_metadata_bsf.c
@@ -28,6 +28,7 @@ typedef struct AV1MetadataContext {
     CBSBSFContext common;
 
     int td;
+    AV1RawOBU td_obu;
 
     int color_primaries;
     int transfer_characteristics;
@@ -107,7 +108,7 @@ static int av1_metadata_update_fragment(AVBSFContext *bsf, AVPacket *pkt,
                                         CodedBitstreamFragment *frag)
 {
     AV1MetadataContext *ctx = bsf->priv_data;
-    AV1RawOBU td, *obu;
+    AV1RawOBU *obu;
     int err, i;
 
     for (i = 0; i < frag->nb_units; i++) {
@@ -124,12 +125,12 @@ static int av1_metadata_update_fragment(AVBSFContext *bsf, AVPacket *pkt,
         if (ctx->td == BSF_ELEMENT_REMOVE)
             ff_cbs_delete_unit(frag, 0);
     } else if (pkt && ctx->td == BSF_ELEMENT_INSERT) {
-        td = (AV1RawOBU) {
+        ctx->td_obu = (AV1RawOBU) {
             .header.obu_type = AV1_OBU_TEMPORAL_DELIMITER,
         };
 
         err = ff_cbs_insert_unit_content(frag, 0, AV1_OBU_TEMPORAL_DELIMITER,
-                                         &td, NULL);
+                                         &ctx->td_obu, NULL);
         if (err < 0) {
             av_log(bsf, AV_LOG_ERROR, "Failed to insert Temporal Delimiter.\n");
             return err;
-- 
2.31.1