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Code Issues Releases Activity

avcodec/dnxhddec: Move mb height check out of non hr branch

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Fixes: out of array access
Fixes: poc.dnxhd

Found-by: Bingchang, Liu@VARAS of IIE
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit 296debd213)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2017-07-26 03:26:59 +02:00
parent 2f75ebe24a
commit 47c0626ec7
1 changed files with 6 additions and 2 deletions
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8
libavcodec/dnxhddec.c
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@ -298,14 +298,18 @@ static int dnxhd_decode_header(DNXHDContext *ctx, AVFrame *frame,
if (ctx->mb_height > 68 && ff_dnxhd_check_header_prefix_hr(header_prefix)) {
ctx->data_offset = 0x170 + (ctx->mb_height << 2);
} else {
if (ctx->mb_height > 68 ||
(ctx->mb_height << frame->interlaced_frame) > (ctx->height + 15) >> 4) {
if (ctx->mb_height > 68) {
av_log(ctx->avctx, AV_LOG_ERROR,
"mb height too big: %d\n", ctx->mb_height);
return AVERROR_INVALIDDATA;
}
ctx->data_offset = 0x280;
}
if ((ctx->mb_height << frame->interlaced_frame) > (ctx->height + 15) >> 4) {
av_log(ctx->avctx, AV_LOG_ERROR,
"mb height too big: %d\n", ctx->mb_height);
return AVERROR_INVALIDDATA;
}
if (buf_size < ctx->data_offset) {
av_log(ctx->avctx, AV_LOG_ERROR,