Commit dc64f203 authored by Laurent Aimar's avatar Laurent Aimar Committed by Janne Grunau

ptx: check for out of bound reads

Signed-off-by: 's avatarJanne Grunau <janne-libav@jannau.net>
parent 04a845ca
......@@ -39,12 +39,15 @@ static av_cold int ptx_init(AVCodecContext *avctx) {
static int ptx_decode_frame(AVCodecContext *avctx, void *data, int *data_size,
AVPacket *avpkt) {
const uint8_t *buf = avpkt->data;
const uint8_t *buf_end = avpkt->data + avpkt->size;
PTXContext * const s = avctx->priv_data;
AVFrame *picture = data;
AVFrame * const p = &s->picture;
unsigned int offset, w, h, y, stride, bytes_per_pixel;
uint8_t *ptr;
if (buf_end - buf < 14)
return AVERROR_INVALIDDATA;
offset = AV_RL16(buf);
w = AV_RL16(buf+8);
h = AV_RL16(buf+10);
......@@ -57,6 +60,8 @@ static int ptx_decode_frame(AVCodecContext *avctx, void *data, int *data_size,
avctx->pix_fmt = PIX_FMT_RGB555;
if (buf_end - buf < offset)
return AVERROR_INVALIDDATA;
if (offset != 0x2c)
av_log_ask_for_sample(avctx, "offset != 0x2c\n");
......@@ -80,6 +85,8 @@ static int ptx_decode_frame(AVCodecContext *avctx, void *data, int *data_size,
stride = p->linesize[0];
for (y=0; y<h; y++) {
if (buf_end - buf < w * bytes_per_pixel)
break;
#if HAVE_BIGENDIAN
unsigned int x;
for (x=0; x<w*bytes_per_pixel; x+=bytes_per_pixel)
......
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