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Make Indeo 5 decoder more robust on bitstream errors.

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Patch by Maxim ($indeo5dec_author)

Originally committed as revision 22319 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Maxim Poliakovski 2010-03-08 06:52:33 +00:00 committed by Kostya Shishkov
parent 5f1654b25b
commit b5852e8a4d
1 changed files with 8 additions and 4 deletions
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12
libavcodec/indeo5.c
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@ -549,7 +549,7 @@ static int decode_mb_info(IVI5DecContext *ctx, IVIBandDesc *band,
static int decode_band(IVI5DecContext *ctx, int plane_num,
IVIBandDesc *band, AVCodecContext *avctx)
{
int result, i, t, idx1, idx2;
int result, i, t, idx1, idx2, pos;
IVITile *tile;
band->buf = band->bufs[ctx->dst_buf];
@ -590,6 +590,8 @@ static int decode_band(IVI5DecContext *ctx, int plane_num,
FFSWAP(int16_t, band->rv_map->valtab[idx1], band->rv_map->valtab[idx2]);
}
pos = get_bits_count(&ctx->gb);
for (t = 0; t < band->num_tiles; t++) {
tile = &band->tiles[t];
@ -597,7 +599,6 @@ static int decode_band(IVI5DecContext *ctx, int plane_num,
if (tile->is_empty) {
ff_ivi_process_empty_tile(avctx, band, tile,
(ctx->planes[0].bands[0].mb_size >> 3) - (band->mb_size >> 3));
align_get_bits(&ctx->gb);
} else {
tile->data_size = ff_ivi_dec_tile_data_size(&ctx->gb);
@ -606,10 +607,11 @@ static int decode_band(IVI5DecContext *ctx, int plane_num,
break;
result = ff_ivi_decode_blocks(&ctx->gb, band, tile);
if (result < 0) {
av_log(avctx, AV_LOG_ERROR, "Corrupted blocks data encountered!\n");
if (result < 0 || (get_bits_count(&ctx->gb) - pos) >> 3 != tile->data_size) {
av_log(avctx, AV_LOG_ERROR, "Corrupted tile data encountered!\n");
break;
}
pos += tile->data_size << 3; // skip to next tile
}
}
@ -632,6 +634,8 @@ static int decode_band(IVI5DecContext *ctx, int plane_num,
}
#endif
align_get_bits(&ctx->gb);
return result;
}