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vorbis: An additional defense in the Vorbis codec.

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Fixes Bug: #190
Chromium Bug: #100543
Related to CVE-2011-3893

Signed-off-by: Reinhard Tartler <siretart@tauware.de>
(cherry picked from commit afb2aa5379)

Signed-off-by: Reinhard Tartler <siretart@tauware.de>
(cherry picked from commit b0283ccb9e)

Conflicts:

	libavcodec/vorbis_dec.c
This commit is contained in:
Chris Evans 2012-01-05 21:25:41 +01:00 committed by Reinhard Tartler
parent 42f0a66968
commit a5e0afe3c9
1 changed files with 28 additions and 10 deletions
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38
libavcodec/vorbis_dec.c
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@ -1262,6 +1262,7 @@ static av_always_inline int vorbis_residue_decode_internal(vorbis_context *vc,
uint_fast8_t *do_not_decode,
float *vec,
uint_fast16_t vlen,
unsigned ch_left,
int vr_type)
{
GetBitContext *gb = &vc->gb;
@ -1273,6 +1274,7 @@ static av_always_inline int vorbis_residue_decode_internal(vorbis_context *vc,
uint_fast8_t ch_used;
uint_fast8_t i,j,l;
uint_fast16_t k;
unsigned max_output = (ch - 1) * vlen;
if (vr_type == 2) {
for (j = 1; j < ch; ++j)
@ -1280,8 +1282,15 @@ static av_always_inline int vorbis_residue_decode_internal(vorbis_context *vc,
if (do_not_decode[0])
return 0;
ch_used = 1;
max_output += vr->end / ch;
} else {
ch_used = ch;
max_output += vr->end;
}
if (max_output > ch_left * vlen) {
av_log(vc->avccontext, AV_LOG_ERROR, "Insufficient output buffer\n");
return -1;
}
AV_DEBUG(" residue type 0/1/2 decode begin, ch: %d cpc %d \n", ch, c_p_c);
@ -1403,14 +1412,16 @@ static av_always_inline int vorbis_residue_decode_internal(vorbis_context *vc,
static inline int vorbis_residue_decode(vorbis_context *vc, vorbis_residue *vr,
uint_fast8_t ch,
uint_fast8_t *do_not_decode,
float *vec, uint_fast16_t vlen)
float *vec, uint_fast16_t vlen,
unsigned ch_left)
{
if (vr->type == 2)
return vorbis_residue_decode_internal(vc, vr, ch, do_not_decode, vec, vlen, 2);
return vorbis_residue_decode_internal(vc, vr, ch, do_not_decode, vec, vlen, ch_left, 2);
else if (vr->type == 1)
return vorbis_residue_decode_internal(vc, vr, ch, do_not_decode, vec, vlen, 1);
return vorbis_residue_decode_internal(vc, vr, ch, do_not_decode, vec, vlen, ch_left, 1);
else if (vr->type == 0)
return vorbis_residue_decode_internal(vc, vr, ch, do_not_decode, vec, vlen, 0);
return vorbis_residue_decode_internal(vc, vr, ch, do_not_decode, vec, vlen, ch_left, 0);
else {
av_log(vc->avccontext, AV_LOG_ERROR, " Invalid residue type while residue decode?! \n");
return -1;
@ -1473,7 +1484,8 @@ static int vorbis_parse_audio_packet(vorbis_context *vc)
uint_fast8_t res_num = 0;
int_fast16_t retlen = 0;
float fadd_bias = vc->add_bias;
int ch_left = vc->audio_channels;
unsigned ch_left = vc->audio_channels;
unsigned vlen;
if (get_bits1(gb)) {
av_log(vc->avccontext, AV_LOG_ERROR, "Not a Vorbis I audio packet.\n");
@ -1492,11 +1504,12 @@ static int vorbis_parse_audio_packet(vorbis_context *vc)
blockflag = vc->modes[mode_number].blockflag;
blocksize = vc->blocksize[blockflag];
vlen = blocksize / 2;
if (blockflag)
skip_bits(gb, 2); // previous_window, next_window
memset(ch_res_ptr, 0, sizeof(float) * vc->audio_channels * blocksize / 2); //FIXME can this be removed ?
memset(ch_floor_ptr, 0, sizeof(float) * vc->audio_channels * blocksize / 2); //FIXME can this be removed ?
memset(ch_res_ptr, 0, sizeof(float) * vc->audio_channels * vlen); //FIXME can this be removed ?
memset(ch_floor_ptr, 0, sizeof(float) * vc->audio_channels * vlen); //FIXME can this be removed ?
// Decode floor
@ -1516,7 +1529,7 @@ static int vorbis_parse_audio_packet(vorbis_context *vc)
return -1;
}
no_residue[i] = ret;
ch_floor_ptr += blocksize / 2;
ch_floor_ptr += vlen;
}
// Nonzero vector propagate
@ -1533,6 +1546,7 @@ static int vorbis_parse_audio_packet(vorbis_context *vc)
for (i = 0; i < mapping->submaps; ++i) {
vorbis_residue *residue;
uint_fast8_t ch = 0;
int ret;
for (j = 0; j < vc->audio_channels; ++j) {
if ((mapping->submaps == 1) || (i == mapping->mux[j])) {
@ -1551,9 +1565,13 @@ static int vorbis_parse_audio_packet(vorbis_context *vc)
av_log(vc->avccontext, AV_LOG_ERROR, "Too many channels in vorbis_floor_decode.\n");
return -1;
}
vorbis_residue_decode(vc, residue, ch, do_not_decode, ch_res_ptr, blocksize/2);
if (ch) {
ret = vorbis_residue_decode(vc, residue, ch, do_not_decode, ch_res_ptr, vlen, ch_left);
if (ret < 0)
return ret;
}
ch_res_ptr += ch * blocksize / 2;
ch_res_ptr += ch * vlen;
ch_left -= ch;
}