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Merge commit 'f4a8a0080537484154bb74e08ec76cbcbd25484b'

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* commit 'f4a8a0080537484154bb74e08ec76cbcbd25484b':
  sgidec: fix buffer size check in expand_rle_row()

Conflicts:
	libavcodec/sgidec.c

See: 39c56ef9216c508a2c19cef93600e6590b4595cd
Merged-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2014-01-06 14:40:26 +01:00
commit e86cd37a70
1 changed files with 18 additions and 4 deletions
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22
libavcodec/sgidec.c
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@ -27,6 +27,7 @@
#include "sgi.h"
typedef struct SgiState {
AVCodecContext *avctx;
unsigned int width;
unsigned int height;
unsigned int depth;
@ -39,15 +40,16 @@ typedef struct SgiState {
* Expand an RLE row into a channel.
* @param s the current image state
* @param out_buf Points to one line after the output buffer.
* @param out_end end of line in output buffer
* @param len length of out_buf in bytes
* @param pixelstride pixel stride of input buffer
* @return size of output in bytes, else return error code.
*/
static int expand_rle_row(SgiState *s, uint8_t *out_buf,
uint8_t *out_end, int pixelstride)
int len, int pixelstride)
{
unsigned char pixel, count;
unsigned char *orig = out_buf;
uint8_t *out_end = out_buf + len;
while (out_buf < out_end) {
if (bytestream2_get_bytes_left(&s->g) < 1)
@ -58,8 +60,10 @@ static int expand_rle_row(SgiState *s, uint8_t *out_buf,
}
/* Check for buffer overflow. */
if (out_end - out_buf <= pixelstride * (count - 1))
if (out_end - out_buf <= pixelstride * (count - 1)) {
av_log(s->avctx, AV_LOG_ERROR, "Invalid pixel count.\n");
return AVERROR_INVALIDDATA;
}
if (pixel & 0x80) {
while (count--) {
@ -103,7 +107,7 @@ static int read_rle_sgi(uint8_t *out_buf, SgiState *s)
dest_row -= s->linesize;
start_offset = bytestream2_get_be32(&g_table);
bytestream2_seek(&s->g, start_offset, SEEK_SET);
if (expand_rle_row(s, dest_row + z, dest_row + s->width*s->depth,
if (expand_rle_row(s, dest_row + z, s->width*s->depth,
s->depth) != s->width) {
return AVERROR_INVALIDDATA;
}
@ -231,6 +235,15 @@ static int decode_frame(AVCodecContext *avctx,
return avpkt->size;
}
static av_cold int sgi_decode_init(AVCodecContext *avctx)
{
SgiState *s = avctx->priv_data;
s->avctx = avctx;
return 0;
}
AVCodec ff_sgi_decoder = {
.name = "sgi",
.long_name = NULL_IF_CONFIG_SMALL("SGI image"),
@ -238,5 +251,6 @@ AVCodec ff_sgi_decoder = {
.id = AV_CODEC_ID_SGI,
.priv_data_size = sizeof(SgiState),
.decode = decode_frame,
.init = sgi_decode_init,
.capabilities = CODEC_CAP_DR1,
};