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avcodec/pnmdec: fix undefined behaviour 

Signed-off-by: Paul B Mahol <onemda@gmail.com>
This commit is contained in:
Paul B Mahol 2016-09-05 10:06:25 +02:00
parent 880d8e88ee
commit e7bc9623e5
1 changed files with 3 additions and 3 deletions
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6
libavcodec/pnmdec.c
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@ -124,7 +124,7 @@ static int pnm_decode_frame(AVCodecContext *avctx, void *data,
do_read:
ptr = p->data[0];
linesize = p->linesize[0];
if (s->bytestream + n * avctx->height > s->bytestream_end)
if (n * avctx->height > s->bytestream_end - s->bytestream)
return AVERROR_INVALIDDATA;
if(s->type < 4 || (is_mono && s->type==7)){
for (i=0; i<avctx->height; i++) {
@ -188,7 +188,7 @@ static int pnm_decode_frame(AVCodecContext *avctx, void *data,
linesize = p->linesize[0];
if (s->maxval >= 256)
n *= 2;
if (s->bytestream + n * avctx->height * 3 / 2 > s->bytestream_end)
if (n * avctx->height * 3 / 2 > s->bytestream_end - s->bytestream)
return AVERROR_INVALIDDATA;
for (i = 0; i < avctx->height; i++) {
samplecpy(ptr, s->bytestream, n, s->maxval);
@ -218,7 +218,7 @@ static int pnm_decode_frame(AVCodecContext *avctx, void *data,
n = avctx->width * 2;
ptr = p->data[0];
linesize = p->linesize[0];
if (s->bytestream + n * avctx->height * 3 / 2 > s->bytestream_end)
if (n * avctx->height * 3 / 2 > s->bytestream_end - s->bytestream)
return AVERROR_INVALIDDATA;
for (i = 0; i < avctx->height; i++) {
for (j = 0; j < n / 2; j++) {