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| author | Justin Ruggles <justin.ruggles@gmail.com> | 2014-06-22 13:19:36 -0400 |
|---|---|---|
| committer | Justin Ruggles <justin.ruggles@gmail.com> | 2014-06-22 20:31:58 -0400 |
| commit | f2f2e7627f0c878d13275af5d166ec5932665e28 (patch) | |
| tree | 941b6688d11ec10778656d36d44d8aee6b9a9854 | |
| parent | 44127546b0a81dc9dd6190739a62d48f0044c6f3 (diff) | |
| download | ffmpeg-f2f2e7627f0c878d13275af5d166ec5932665e28.tar.gz | |
Check mp3 header before calling avpriv_mpegaudio_decode_header().
As indicated in the function documentation, the header MUST be
checked prior to calling it because no consistency check is done
there.
CC:libav-stable@libav.org
| -rw-r--r-- | libavcodec/libmp3lame.c | 8 | ||||
| -rw-r--r-- | libavformat/mp3enc.c | 17 |
2 files changed, 17 insertions, 8 deletions
diff --git a/libavcodec/libmp3lame.c b/libavcodec/libmp3lame.c index eebc65c44d..dee1909609 100644 --- a/libavcodec/libmp3lame.c +++ b/libavcodec/libmp3lame.c @@ -182,6 +182,7 @@ static int mp3lame_encode_frame(AVCodecContext *avctx, AVPacket *avpkt, MPADecodeHeader hdr; int len, ret, ch; int lame_result; + uint32_t h; if (frame) { switch (avctx->sample_fmt) { @@ -237,7 +238,12 @@ static int mp3lame_encode_frame(AVCodecContext *avctx, AVPacket *avpkt, determine the frame size. */ if (s->buffer_index < 4) return 0; - if (avpriv_mpegaudio_decode_header(&hdr, AV_RB32(s->buffer))) { + h = AV_RB32(s->buffer); + if (ff_mpa_check_header(h) < 0) { + av_log(avctx, AV_LOG_ERROR, "Invalid mp3 header at start of buffer\n"); + return AVERROR_BUG; + } + if (avpriv_mpegaudio_decode_header(&hdr, h)) { av_log(avctx, AV_LOG_ERROR, "free format output not supported\n"); return -1; } diff --git a/libavformat/mp3enc.c b/libavformat/mp3enc.c index 932625864f..476d7f71cb 100644 --- a/libavformat/mp3enc.c +++ b/libavformat/mp3enc.c @@ -252,13 +252,16 @@ static int mp3_write_audio_packet(AVFormatContext *s, AVPacket *pkt) if (mp3->xing_offset && pkt->size >= 4) { MPADecodeHeader c; - - avpriv_mpegaudio_decode_header(&c, AV_RB32(pkt->data)); - - if (!mp3->initial_bitrate) - mp3->initial_bitrate = c.bit_rate; - if ((c.bit_rate == 0) || (mp3->initial_bitrate != c.bit_rate)) - mp3->has_variable_bitrate = 1; + uint32_t h; + + h = AV_RB32(pkt->data); + if (ff_mpa_check_header(h) == 0) { + avpriv_mpegaudio_decode_header(&c, h); + if (!mp3->initial_bitrate) + mp3->initial_bitrate = c.bit_rate; + if ((c.bit_rate == 0) || (mp3->initial_bitrate != c.bit_rate)) + mp3->has_variable_bitrate = 1; + } mp3_xing_add_frame(mp3, pkt); } |