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amrnbdec: check frame size before decoding.

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Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
CC: libav-stable@libav.org
Signed-off-by: Ronald S. Bultje <rsbultje@gmail.com>
This commit is contained in:
Vitor Sessak 2012-02-29 22:09:10 +01:00 committed by Ronald S. Bultje
parent 8a9faf33f2
commit 882abda5a2
1 changed files with 8 additions and 0 deletions
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8
libavcodec/amrnbdec.c
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@ -200,6 +200,10 @@ static enum Mode unpack_bitstream(AMRContext *p, const uint8_t *buf,
p->bad_frame_indicator = !get_bits1(&gb); // quality bit
skip_bits(&gb, 2); // two padding bits
if (mode >= N_MODES || buf_size < frame_sizes_nb[mode] + 1) {
return NO_DATA;
}
if (mode < MODE_DTX)
ff_amr_bit_reorder((uint16_t *) &p->frame, sizeof(AMRNBFrame), buf + 1,
amr_unpacking_bitmaps_per_mode[mode]);
@ -947,6 +951,10 @@ static int amrnb_decode_frame(AVCodecContext *avctx, void *data,
buf_out = (float *)p->avframe.data[0];
p->cur_frame_mode = unpack_bitstream(p, buf, buf_size);
if (p->cur_frame_mode == NO_DATA) {
av_log(avctx, AV_LOG_ERROR, "Corrupt bitstream\n");
return AVERROR_INVALIDDATA;
}
if (p->cur_frame_mode == MODE_DTX) {
av_log_missing_feature(avctx, "dtx mode", 1);
return -1;