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new 387ad6d102 avformat/mov: validate APV access unit length before
passing to decoder
387ad6d102 is described below
commit 387ad6d1029c6c75a62cf3ed2d2526f8d8329354
Author: Omkhar Arasaratnam <[email protected]>
AuthorDate: Mon May 25 04:47:27 2026 +0200
Commit: michaelni <[email protected]>
CommitDate: Mon May 25 21:53:01 2026 +0000
avformat/mov: validate APV access unit length before passing to decoder
libavformat/mov.c read the APV AU length field directly from the
sample without sanity-checking against the remaining sample size or
a documented maximum. The patch validates that au_size is bounded by
the remaining sample bytes and that the AU envelope (4 bytes plus
au_size) fits inside the declared sample size.
Validate the access unit length at the demuxer boundary so that the
decoder is not handed an attacker-controllable buffer size. Returns
AVERROR_INVALIDDATA on the bound failure with an explicit log line.
Found-by: Claude (Anthropic). Human-verified and reported by
Omkhar Arasaratnam <[email protected]>.
Signed-off-by: Omkhar Arasaratnam <[email protected]>
---
libavformat/mov.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/libavformat/mov.c b/libavformat/mov.c
index 1cda7a1d05..d0d4910676 100644
--- a/libavformat/mov.c
+++ b/libavformat/mov.c
@@ -11619,6 +11619,12 @@ static int mov_read_packet(AVFormatContext *s,
AVPacket *pkt)
#endif
else if (st->codecpar->codec_id == AV_CODEC_ID_APV && sample->size >
4) {
const uint32_t au_size = avio_rb32(sc->pb);
+ if (au_size > sample->size - 4) {
+ av_log(s, AV_LOG_ERROR,
+ "APV au_size %u exceeds sample body %d\n",
+ au_size, sample->size - 4);
+ return AVERROR_INVALIDDATA;
+ }
ret = av_get_packet(sc->pb, pkt, au_size);
} else
ret = av_get_packet(sc->pb, pkt, sample->size);
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