[FFmpeg-cvslog] avcodec/flac_parser: Assert that we do not overrun the link_penalty array

[Michael Niedermayer]

ffmpeg | branch: master | Michael Niedermayer <michael at niedermayer.cc> | Sun May  5 01:51:59 2024 +0200| [9af348bd1aa41ea10d6719c56ed2b4eda97642f3] | committer: Michael Niedermayer

avcodec/flac_parser: Assert that we do not overrun the link_penalty array

Helps: CID1454676 Out-of-bounds read

Sponsored-by: Sovereign Tech Fund
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=9af348bd1aa41ea10d6719c56ed2b4eda97642f3
---

 libavcodec/flac_parser.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/libavcodec/flac_parser.c b/libavcodec/flac_parser.c
index 47904d515a..d9c47801f8 100644
--- a/libavcodec/flac_parser.c
+++ b/libavcodec/flac_parser.c
@@ -518,6 +518,8 @@ static int check_header_mismatch(FLACParseContext  *fpc,
         for (i = 0; i < FLAC_MAX_SEQUENTIAL_HEADERS && curr != child; i++)
             curr = curr->next;
 
+        av_assert0(i < FLAC_MAX_SEQUENTIAL_HEADERS);
+
         if (header->link_penalty[i] < FLAC_HEADER_CRC_FAIL_PENALTY ||
             header->link_penalty[i] == FLAC_HEADER_NOT_PENALIZED_YET) {
             FLACHeaderMarker *start, *end;