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Check NAL unit size to avoid reading past the buffer. 

This fixes issue1907

Patch by Thomas Devanneaux gmail(thomdev)

Originally committed as revision 23078 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Thomas Devanneaux 2010-05-10 07:08:57 +00:00 committed by Benoit Fouet
parent 8ad802e610
commit 52486603b5
1 changed files with 14 additions and 1 deletions
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15
libavcodec/h264_mp4toannexb_bsf.c
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@ -55,7 +55,9 @@ static int h264_mp4toannexb_filter(AVBitStreamFilterContext *bsfc,
int keyframe) {
H264BSFContext *ctx = bsfc->priv_data;
uint8_t unit_type;
uint32_t nal_size, cumul_size = 0;
int32_t nal_size;
uint32_t cumul_size = 0;
const uint8_t *buf_end = buf + buf_size;
/* nothing to filter */
if (!avctx->extradata || avctx->extradata_size < 6) {
@ -109,6 +111,9 @@ static int h264_mp4toannexb_filter(AVBitStreamFilterContext *bsfc,
*poutbuf_size = 0;
*poutbuf = NULL;
do {
if (buf + ctx->length_size > buf_end)
goto fail;
if (ctx->length_size == 1)
nal_size = buf[0];
else if (ctx->length_size == 2)
@ -119,6 +124,9 @@ static int h264_mp4toannexb_filter(AVBitStreamFilterContext *bsfc,
buf += ctx->length_size;
unit_type = *buf & 0x1f;
if (buf + nal_size > buf_end || nal_size < 0)
goto fail;
/* prepend only to the first type 5 NAL unit of an IDR picture */
if (ctx->first_idr && unit_type == 5) {
alloc_and_copy(poutbuf, poutbuf_size,
@ -139,6 +147,11 @@ static int h264_mp4toannexb_filter(AVBitStreamFilterContext *bsfc,
} while (cumul_size < buf_size);
return 1;
fail:
av_freep(poutbuf);
*poutbuf_size = 0;
return AVERROR(EINVAL);
}
static void h264_mp4toannexb_close(AVBitStreamFilterContext *bsfc)