[FFmpeg-cvslog] mpc7: check output buffer size before decoding
Justin Ruggles
git at videolan.org
Mon Oct 3 01:17:04 CEST 2011
ffmpeg | branch: master | Justin Ruggles <justin.ruggles at gmail.com> | Tue Sep 13 18:53:18 2011 -0400| [c8b5c4d27409dfdcec80868686b173ba446c998b] | committer: Justin Ruggles
mpc7: check output buffer size before decoding
> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=c8b5c4d27409dfdcec80868686b173ba446c998b
---
libavcodec/mpc7.c | 10 ++++++++--
1 files changed, 8 insertions(+), 2 deletions(-)
diff --git a/libavcodec/mpc7.c b/libavcodec/mpc7.c
index a98cb0e..02c83fc 100644
--- a/libavcodec/mpc7.c
+++ b/libavcodec/mpc7.c
@@ -197,7 +197,7 @@ static int mpc7_decode_frame(AVCodecContext * avctx,
int i, ch;
int mb = -1;
Band *bands = c->bands;
- int off;
+ int off, out_size;
int bits_used, bits_avail;
memset(bands, 0, sizeof(bands));
@@ -205,6 +205,12 @@ static int mpc7_decode_frame(AVCodecContext * avctx,
av_log(avctx, AV_LOG_ERROR, "Too small buffer passed (%i bytes)\n", buf_size);
}
+ out_size = (buf[1] ? c->lastframelen : MPC_FRAME_SIZE) * 4;
+ if (*data_size < out_size) {
+ av_log(avctx, AV_LOG_ERROR, "Output buffer is too small\n");
+ return AVERROR(EINVAL);
+ }
+
bits = av_malloc(((buf_size - 1) & ~3) + FF_INPUT_BUFFER_PADDING_SIZE);
c->dsp.bswap_buf((uint32_t*)bits, (const uint32_t*)(buf + 4), (buf_size - 4) >> 2);
init_get_bits(&gb, bits, (buf_size - 4)* 8);
@@ -277,7 +283,7 @@ static int mpc7_decode_frame(AVCodecContext * avctx,
*data_size = 0;
return buf_size;
}
- *data_size = (buf[1] ? c->lastframelen : MPC_FRAME_SIZE) * 4;
+ *data_size = out_size;
return buf_size;
}
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