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avcodec/pgssubdec: Check input buffer size in parse_presentation_segment() 

Might fix overread, no testcase known though.

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2014-06-30 18:23:08 +02:00
parent ae9a73de2a
commit 89bcb77726
1 changed files with 8 additions and 0 deletions
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8
libavcodec/pgssubdec.c
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@ -380,6 +380,7 @@ static int parse_presentation_segment(AVCodecContext *avctx,
{
PGSSubContext *ctx = avctx->priv_data;
int i, state, ret;
const uint8_t *buf_end = buf + buf_size;
// Video descriptor
int w = bytestream_get_be16(&buf);
@ -433,6 +434,13 @@ static int parse_presentation_segment(AVCodecContext *avctx,
for (i = 0; i < ctx->presentation.object_count; i++)
{
if (buf_end - buf < 8) {
av_log(avctx, AV_LOG_ERROR, "Insufficent space for object\n");
ctx->presentation.object_count = i;
return AVERROR_INVALIDDATA;
}
ctx->presentation.objects[i].id = bytestream_get_be16(&buf);
ctx->presentation.objects[i].window_id = bytestream_get_byte(&buf);
ctx->presentation.objects[i].composition_flag = bytestream_get_byte(&buf);