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some (probably exploitable) out of array write fixes

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Originally committed as revision 7802 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer 2007-02-02 02:58:01 +00:00
parent 7348ed6e94
commit 14c49573d8
1 changed files with 23 additions and 2 deletions
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25
libavcodec/adpcm.c
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@ -602,6 +602,10 @@ static int adpcm_decode_init(AVCodecContext * avctx)
{
ADPCMContext *c = avctx->priv_data;
if(avctx->channels > 2U){
return -1;
}
c->channel = 0;
c->status[0].predictor = c->status[1].predictor = 0;
c->status[0].step_index = c->status[1].step_index = 0;
@ -826,6 +830,7 @@ static int adpcm_decode_frame(AVCodecContext *avctx,
int n, m, channel, i;
int block_predictor[2];
short *samples;
short *samples_end;
uint8_t *src;
int st; /* stereo */
@ -847,7 +852,15 @@ static int adpcm_decode_frame(AVCodecContext *avctx,
if (!buf_size)
return 0;
//should protect all 4bit ADPCM variants
//8 is needed for CODEC_ID_ADPCM_IMA_WAV with 2 channels
//
if(*data_size/4 < buf_size + 8)
return -1;
samples = data;
samples_end= samples + *data_size/2;
*data_size= 0;
src = buf;
st = avctx->channels == 2 ? 1 : 0;
@ -1031,6 +1044,9 @@ static int adpcm_decode_frame(AVCodecContext *avctx,
if (avctx->block_align != 0 && buf_size > avctx->block_align)
buf_size = avctx->block_align;
if(buf_size + 16 > (samples_end - samples)*3/8)
return -1;
c->status[0].predictor = (int16_t)(src[10] | (src[11] << 8));
c->status[1].predictor = (int16_t)(src[12] | (src[13] << 8));
c->status[0].step_index = src[14];
@ -1197,7 +1213,7 @@ static int adpcm_decode_frame(AVCodecContext *avctx,
src++;
}
} else if (avctx->codec->id == CODEC_ID_ADPCM_SBPRO_3) {
while (src < buf + buf_size) {
while (src < buf + buf_size && samples + 2 < samples_end) {
*samples++ = adpcm_sbpro_expand_nibble(&c->status[0],
(src[0] >> 5) & 0x07, 3, 0);
*samples++ = adpcm_sbpro_expand_nibble(&c->status[0],
@ -1207,7 +1223,7 @@ static int adpcm_decode_frame(AVCodecContext *avctx,
src++;
}
} else {
while (src < buf + buf_size) {
while (src < buf + buf_size && samples + 3 < samples_end) {
*samples++ = adpcm_sbpro_expand_nibble(&c->status[0],
(src[0] >> 6) & 0x03, 2, 2);
*samples++ = adpcm_sbpro_expand_nibble(&c->status[st],
@ -1229,6 +1245,11 @@ static int adpcm_decode_frame(AVCodecContext *avctx,
init_get_bits(&gb, buf, size);
//the following return -1 may be removed only after
//1. correctly spliting the stream into packets at demuxer or parser level
//2. checking array bounds when writing
//3. moving the global nb_bits header into extradata
return -1;
// first frame, read bits & inital values
if (!c->nb_bits)
{