[FFmpeg-cvslog] avcodec/pixlet: consider minimum plane header in the minimal packet size

[Michael Niedermayer]

ffmpeg | branch: master | Michael Niedermayer <michael at niedermayer.cc> | Sun May  1 00:20:40 2022 +0200| [4f9ee4bf43623ff0960d3d8cf2025c2cdb54382a] | committer: Michael Niedermayer

avcodec/pixlet: consider minimum plane header in the minimal packet size

Fixes: Timeout
Fixes: 46956/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_PIXLET_fuzzer-5698161106092032

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=4f9ee4bf43623ff0960d3d8cf2025c2cdb54382a
---

 libavcodec/pixlet.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavcodec/pixlet.c b/libavcodec/pixlet.c
index 3174f30e91..4f9282bb94 100644
--- a/libavcodec/pixlet.c
+++ b/libavcodec/pixlet.c
@@ -611,7 +611,7 @@ static int pixlet_decode_frame(AVCodecContext *avctx, AVFrame *p,
     bytestream2_init(&ctx->gb, avpkt->data, avpkt->size);
 
     pktsize = bytestream2_get_be32(&ctx->gb);
-    if (pktsize <= 44 || pktsize - 4 > bytestream2_get_bytes_left(&ctx->gb)) {
+    if (pktsize <= 44 + (NB_LEVELS * 8 + 6) * 3 || pktsize - 4 > bytestream2_get_bytes_left(&ctx->gb)) {
         av_log(avctx, AV_LOG_ERROR, "Invalid packet size %"PRIu32"\n", pktsize);
         return AVERROR_INVALIDDATA;
     }