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lagarith: pad RGB buffer by 1 byte.

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For left HFYU prediction, we predict from the buffer buf+1 using 8- or
16-byte reads. This means that aligning the buffer by 16 bytes is in
itself not sufficient, because if the width itself is 16- or 8-byte
aligned, the buffer will not be padded, and thus a read of size 16 at
buf+1 will overflow boundaries at the right edge. Padding the buffer by
1 byte is sufficient to not overflow its boundaries.

Fixes bug 342.
This commit is contained in:
Ronald S. Bultje 2012-08-02 20:46:09 -07:00
parent da6505ad2f
commit 98d0d19208
1 changed files with 1 additions and 1 deletions
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2
libavcodec/lagarith.c
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@ -553,7 +553,7 @@ static int lag_decode_frame(AVCodecContext *avctx,
if (!l->rgb_planes) { if (!l->rgb_planes) {
l->rgb_stride = FFALIGN(avctx->width, 16); l->rgb_stride = FFALIGN(avctx->width, 16);
l->rgb_planes = av_malloc(l->rgb_stride * avctx->height * planes); l->rgb_planes = av_malloc(l->rgb_stride * avctx->height * planes + 1);
if (!l->rgb_planes) { if (!l->rgb_planes) {
av_log(avctx, AV_LOG_ERROR, "cannot allocate temporary buffer\n"); av_log(avctx, AV_LOG_ERROR, "cannot allocate temporary buffer\n");
return AVERROR(ENOMEM); return AVERROR(ENOMEM);