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lagarith: reallocate rgb_planes when needed

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Fixes invalid writes on pixel format changes.

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
CC:libav-stable@libav.org
This commit is contained in:
Anton Khirnov 2013-11-28 10:54:35 +01:00
parent 2240e2078d
commit 4c3e1956ee
1 changed files with 6 additions and 6 deletions
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12
libavcodec/lagarith.c
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@ -52,6 +52,7 @@ typedef struct LagarithContext {
int zeros; /**< number of consecutive zero bytes encountered */
int zeros_rem; /**< number of zero bytes remaining to output */
uint8_t *rgb_planes;
int rgb_planes_allocated;
int rgb_stride;
} LagarithContext;
@ -564,13 +565,12 @@ static int lag_decode_frame(AVCodecContext *avctx,
offs[1] = offset_gu;
offs[2] = offset_ry;
l->rgb_stride = FFALIGN(avctx->width, 16);
av_fast_malloc(&l->rgb_planes, &l->rgb_planes_allocated,
l->rgb_stride * avctx->height * planes + 1);
if (!l->rgb_planes) {
l->rgb_stride = FFALIGN(avctx->width, 16);
l->rgb_planes = av_malloc(l->rgb_stride * avctx->height * planes + 1);
if (!l->rgb_planes) {
av_log(avctx, AV_LOG_ERROR, "cannot allocate temporary buffer\n");
return AVERROR(ENOMEM);
}
av_log(avctx, AV_LOG_ERROR, "cannot allocate temporary buffer\n");
return AVERROR(ENOMEM);
}
for (i = 0; i < planes; i++)
srcs[i] = l->rgb_planes + (i + 1) * l->rgb_stride * avctx->height - l->rgb_stride;