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indeo: reject negative array indexes

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Reported-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
CC: libav-stable@libav.org
This commit is contained in:
Luca Barbato 2013-07-03 14:55:50 +02:00
parent 6dfacd7ab1
commit 6a10142faa
1 changed files with 29 additions and 13 deletions
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42
libavcodec/ivi_common.c
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@ -44,6 +44,20 @@ static VLC ivi_blk_vlc_tabs[8]; ///< static block Huffman tables
typedef void (*ivi_mc_func) (int16_t *buf, const int16_t *ref_buf,
uint32_t pitch, int mc_type);
static int ivi_mc(ivi_mc_func mc, int16_t *buf, const int16_t *ref_buf,
int offs, int mv_x, int mv_y, uint32_t pitch,
int mc_type)
{
int ref_offs = offs + mv_y * pitch + mv_x;
if (offs < 0 || ref_offs < 0 || !ref_buf)
return AVERROR_INVALIDDATA;
mc(buf + offs, ref_buf + ref_offs, pitch, mc_type);
return 0;
}
/**
* Reverse "nbits" bits of the value "val" and return the result
* in the least significant bits.
@ -444,7 +458,7 @@ static int ivi_decode_coded_blocks(GetBitContext *gb, IVIBandDesc *band,
/* de-zigzag and dequantize */
scan_pos += run;
if (scan_pos >= num_coeffs)
if (scan_pos >= num_coeffs || scan_pos < 0)
break;
pos = band->scan[scan_pos];
@ -459,7 +473,7 @@ static int ivi_decode_coded_blocks(GetBitContext *gb, IVIBandDesc *band,
col_flags[pos & col_mask] |= !!val;
}
if (scan_pos >= num_coeffs && sym != rvmap->eob_sym)
if (scan_pos < 0 || scan_pos >= num_coeffs && sym != rvmap->eob_sym)
return AVERROR_INVALIDDATA; /* corrupt block data */
/* undoing DC coeff prediction for intra-blocks */
@ -475,9 +489,8 @@ static int ivi_decode_coded_blocks(GetBitContext *gb, IVIBandDesc *band,
/* apply motion compensation */
if (!is_intra)
mc(band->buf + offs,
band->ref_buf + offs + mv_y * band->pitch + mv_x,
band->pitch, mc_type);
return ivi_mc(mc, band->buf, band->ref_buf, offs, mv_x, mv_y,
band->pitch, mc_type);
return 0;
}
@ -579,10 +592,12 @@ static int ivi_decode_blocks(GetBitContext *gb, IVIBandDesc *band,
if (band->dc_transform)
band->dc_transform(&prev_dc, band->buf + buf_offs,
band->pitch, blk_size);
} else
mc_no_delta_func(band->buf + buf_offs,
band->ref_buf + buf_offs + mv_y * band->pitch + mv_x,
band->pitch, mc_type);
} else {
ret = ivi_mc(mc_no_delta_func, band->buf, band->ref_buf,
buf_offs, mv_x, mv_y, band->pitch, mc_type);
if (ret < 0)
return ret;
}
}
cbp >>= 1;
@ -607,7 +622,7 @@ static int ivi_process_empty_tile(AVCodecContext *avctx, IVIBandDesc *band,
IVITile *tile, int32_t mv_scale)
{
int x, y, need_mc, mbn, blk, num_blocks, mv_x, mv_y, mc_type;
int offs, mb_offset, row_offset;
int offs, mb_offset, row_offset, ret;
IVIMbInfo *mb, *ref_mb;
const int16_t *src;
int16_t *dst;
@ -685,9 +700,10 @@ static int ivi_process_empty_tile(AVCodecContext *avctx, IVIBandDesc *band,
for (blk = 0; blk < num_blocks; blk++) {
/* adjust block position in the buffer according with its number */
offs = mb->buf_offs + band->blk_size * ((blk & 1) + !!(blk & 2) * band->pitch);
mc_no_delta_func(band->buf + offs,
band->ref_buf + offs + mv_y * band->pitch + mv_x,
band->pitch, mc_type);
ret = ivi_mc(mc_no_delta_func, band->buf, band->ref_buf,
offs, mv_x, mv_y, band->pitch, mc_type);
if (ret < 0)
return ret;
}
}
} else {