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Check codec_id and codec_type in avcodec_open(), based on 43_codec_type_mismatch.patch from chrome

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This is said to be able to lead to a stack based buffer overflow.

Originally committed as revision 19973 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer 2009-09-22 22:44:56 +00:00
parent 6e3fa35d29
commit 4c0dda2b3f
1 changed files with 4 additions and 1 deletions
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5
libavcodec/utils.c
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@ -481,7 +481,10 @@ int attribute_align_arg avcodec_open(AVCodecContext *avctx, AVCodec *codec)
} }
avctx->codec = codec; avctx->codec = codec;
avctx->codec_id = codec->id; if(avctx->codec_id != codec->id || avctx->codec_type != codec->type){
av_log(avctx, AV_LOG_ERROR, "codec type or id mismatches\n");
goto end;
}
avctx->frame_number = 0; avctx->frame_number = 0;
if(avctx->codec->init){ if(avctx->codec->init){
ret = avctx->codec->init(avctx); ret = avctx->codec->init(avctx);