avformat/boadec: Check that channels and block_align are set

Fixes: Infinite loop
Fixes: 26381/clusterfuzz-testcase-minimized-ffmpeg_dem_BOA_fuzzer-5745789089087488
Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

diff --git a/libavformat/boadec.c b/libavformat/boadec.c
index 495090c485e3cb8e1c98991b67c2809e2e085d01..74a6ceecb15438f8473457db6465b0ff1f18aea4 100644 (file)
--- a/libavformat/boadec.c
+++ b/libavformat/boadec.c
@@ -54,12 +54,12 @@ static int read_header(AVFormatContext *s)
     avio_rl32(s->pb);
     st->codecpar->sample_rate = avio_rl32(s->pb);
     st->codecpar->channels    = avio_rl32(s->pb);
-    if (st->codecpar->channels > FF_SANE_NB_CHANNELS)
+    if (st->codecpar->channels > FF_SANE_NB_CHANNELS || st->codecpar->channels <= 0)
         return AVERROR(ENOSYS);
     s->internal->data_offset = avio_rl32(s->pb);
     avio_r8(s->pb);
     st->codecpar->block_align = avio_rl32(s->pb);
-    if (st->codecpar->block_align > INT_MAX / FF_SANE_NB_CHANNELS)
+    if (st->codecpar->block_align > INT_MAX / FF_SANE_NB_CHANNELS || st->codecpar->block_align <= 0)
         return AVERROR_INVALIDDATA;
     st->codecpar->block_align *= st->codecpar->channels;