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avcodec/v210dec: add support for invalid paddings up to 16 bytes

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Fixes ticket #1528.

Signed-off-by: Marton Balint <cus@passwd.hu>
This commit is contained in:
Marton Balint 2022-06-12 04:27:53 +02:00
parent 2e895edb5d
commit a10132b967
1 changed files with 21 additions and 11 deletions
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32
libavcodec/v210dec.c
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@ -126,6 +126,11 @@ static int v210_decode_slice(AVCodecContext *avctx, void *arg, int jobnr, int th
return 0;
}
static int v210_stride(int width, int align) {
int aligned_width = ((width + align - 1) / align) * align;
return aligned_width * 8 / 3;
}
static int decode_frame(AVCodecContext *avctx, AVFrame *pic,
int *got_frame, AVPacket *avpkt)
{
@ -137,20 +142,25 @@ static int decode_frame(AVCodecContext *avctx, AVFrame *pic,
if (s->custom_stride )
stride = s->custom_stride;
else {
int aligned_width = ((avctx->width + 47) / 48) * 48;
stride = aligned_width * 8 / 3;
stride = v210_stride(avctx->width, 48);
if (avpkt->size < stride * avctx->height) {
int align;
for (align = 24; align >= 6; align >>= 1) {
int small_stride = v210_stride(avctx->width, align);
if (avpkt->size == small_stride * avctx->height) {
stride = small_stride;
if (!s->stride_warning_shown)
av_log(avctx, AV_LOG_WARNING, "Broken v210 with too small padding (%d byte) detected\n", align * 8 / 3);
s->stride_warning_shown = 1;
break;
}
}
}
}
if (avpkt->size < (int64_t)stride * avctx->height) {
if ((((avctx->width + 23) / 24) * 24 * 8) / 3 * avctx->height == avpkt->size) {
stride = avpkt->size / avctx->height;
if (!s->stride_warning_shown)
av_log(avctx, AV_LOG_WARNING, "Broken v210 with too small padding (64 byte) detected\n");
s->stride_warning_shown = 1;
} else {
av_log(avctx, AV_LOG_ERROR, "packet too small\n");
return AVERROR_INVALIDDATA;
}
av_log(avctx, AV_LOG_ERROR, "packet too small\n");
return AVERROR_INVALIDDATA;
}
td.stride = stride;
if ( avctx->codec_tag == MKTAG('C', '2', '1', '0')