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lavc: check media type of the decoder before calling it. 

This fixes a segfault where a video decoder was called
from avcodec_decode_audio*().

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2012-04-01 02:57:27 +02:00
parent 2f7bd3b516
commit 7c9d69360c
1 changed files with 14 additions and 0 deletions
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14
libavcodec/utils.c
View File

@ -1404,6 +1404,11 @@ int attribute_align_arg avcodec_decode_video2(AVCodecContext *avctx, AVFrame *pi
// copy to ensure we do not change avpkt // copy to ensure we do not change avpkt
AVPacket tmp = *avpkt; AVPacket tmp = *avpkt;
if (avctx->codec->type != AVMEDIA_TYPE_VIDEO) {
av_log(avctx, AV_LOG_ERROR, "Invalid media type for video\n");
return AVERROR(EINVAL);
}
*got_picture_ptr= 0; *got_picture_ptr= 0;
if((avctx->coded_width||avctx->coded_height) && av_image_check_size(avctx->coded_width, avctx->coded_height, 0, avctx)) if((avctx->coded_width||avctx->coded_height) && av_image_check_size(avctx->coded_width, avctx->coded_height, 0, avctx))
return -1; return -1;
@ -1513,6 +1518,10 @@ int attribute_align_arg avcodec_decode_audio4(AVCodecContext *avctx,
av_log(avctx, AV_LOG_ERROR, "invalid packet: NULL data, size != 0\n"); av_log(avctx, AV_LOG_ERROR, "invalid packet: NULL data, size != 0\n");
return AVERROR(EINVAL); return AVERROR(EINVAL);
} }
if (avctx->codec->type != AVMEDIA_TYPE_AUDIO) {
av_log(avctx, AV_LOG_ERROR, "Invalid media type for audio\n");
return AVERROR(EINVAL);
}
if ((avctx->codec->capabilities & CODEC_CAP_DELAY) || avpkt->size) { if ((avctx->codec->capabilities & CODEC_CAP_DELAY) || avpkt->size) {
av_packet_split_side_data(avpkt); av_packet_split_side_data(avpkt);
@ -1536,6 +1545,11 @@ int avcodec_decode_subtitle2(AVCodecContext *avctx, AVSubtitle *sub,
{ {
int ret; int ret;
if (avctx->codec->type != AVMEDIA_TYPE_SUBTITLE) {
av_log(avctx, AV_LOG_ERROR, "Invalid media type for subtitles\n");
return AVERROR(EINVAL);
}
avctx->pkt = avpkt; avctx->pkt = avpkt;
*got_sub_ptr = 0; *got_sub_ptr = 0;
avcodec_get_subtitle_defaults(sub); avcodec_get_subtitle_defaults(sub);