[FFmpeg-cvslog] avformat/iamf_parse: ensure there's at most one of each parameter types in audio elements

[James Almer]

ffmpeg | branch: release/7.1 | James Almer <jamrial at gmail.com> | Mon Feb 17 11:41:25 2025 -0300| [9abf2aef37a4c1bd81f89a9ff76dfee3e61710e6] | committer: James Almer

avformat/iamf_parse: ensure there's at most one of each parameter types in audio elements

Should prevent potential memory leaks on invalid files.

Signed-off-by: James Almer <jamrial at gmail.com>
(cherry picked from commit 5470d024e18968b3bdef2b745966f7617f1eb9f2)

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=9abf2aef37a4c1bd81f89a9ff76dfee3e61710e6
---

 libavformat/iamf_parse.c | 14 +++++++++++---
 1 file changed, 11 insertions(+), 3 deletions(-)

diff --git a/libavformat/iamf_parse.c b/libavformat/iamf_parse.c
index 7c784c6955..7b3b1e87fa 100644
--- a/libavformat/iamf_parse.c
+++ b/libavformat/iamf_parse.c
@@ -747,11 +747,19 @@ static int audio_element_obu(void *s, IAMFContext *c, AVIOContext *pb, int len)
         type = ffio_read_leb(pbc);
         if (type == AV_IAMF_PARAMETER_DEFINITION_MIX_GAIN)
             ret = AVERROR_INVALIDDATA;
-        else if (type == AV_IAMF_PARAMETER_DEFINITION_DEMIXING)
+        else if (type == AV_IAMF_PARAMETER_DEFINITION_DEMIXING) {
+            if (element->demixing_info) {
+                ret = AVERROR_INVALIDDATA;
+                goto fail;
+            }
             ret = param_parse(s, c, pbc, type, audio_element, &element->demixing_info);
-        else if (type == AV_IAMF_PARAMETER_DEFINITION_RECON_GAIN)
+        } else if (type == AV_IAMF_PARAMETER_DEFINITION_RECON_GAIN) {
+            if (element->recon_gain_info) {
+                ret = AVERROR_INVALIDDATA;
+                goto fail;
+            }
             ret = param_parse(s, c, pbc, type, audio_element, &element->recon_gain_info);
-        else {
+        } else {
             unsigned param_definition_size = ffio_read_leb(pbc);
             avio_skip(pbc, param_definition_size);
         }