mpeg4audio: validate sample_rate

A negative sample rate doesn't make sense and triggers assertions in
av_rescale_rnd.

Also check for errors from avpriv_mpeg4audio_get_config in
ff_mp4_read_dec_config_descr.

Signed-off-by: Andreas Cadhalpun <Andreas.Cadhalpun@googlemail.com>

1 files changed, 5 insertions, 0 deletions

diff --git a/libavcodec/mpeg4audio.c b/libavcodec/mpeg4audio.c
index 188d843eee..01c374fddc 100644
--- a/libavcodec/mpeg4audio.c
+++ b/libavcodec/mpeg4audio.c
@@ -42,6 +42,11 @@ static int parse_config_ALS(GetBitContext *gb, MPEG4AudioConfig *c)
     // which are buggy in old ALS conformance files
     c->sample_rate = get_bits_long(gb, 32);
 
+    if (c->sample_rate <= 0) {
+        av_log(NULL, AV_LOG_ERROR, "Invalid sample rate %d\n", c->sample_rate);
+        return AVERROR_INVALIDDATA;
+    }
+
     // skip number of samples
     skip_bits_long(gb, 32);