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fix multiple crashes on invalid files

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This commit is contained in:
Sean Barrett 2015-11-08 16:22:07 -08:00
parent bdac1d2ab4
commit bc2219e1b3
2 changed files with 17 additions and 5 deletions
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20
stb_vorbis.c
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@ -1,8 +1,11 @@
// Ogg Vorbis audio decoder - v1.06 - public domain
// Ogg Vorbis audio decoder - v1.07 - public domain
// http://nothings.org/stb_vorbis/
//
// Written by Sean Barrett in 2007, last updated in 2014
// Sponsored by RAD Game Tools.
// Original version written by Sean Barrett in 2007.
//
// Originally sponsored by RAD Game Tools. Seeking sponsored
// by Phillip Bennefall, Marc Andersen, Elias Software, vgstorm.com,
// Aras Pranckevicius, and Sean Barrett.
//
// LICENSE
//
@ -30,11 +33,13 @@
// Laurent Gomila Marc LeBlanc Ronny Chevalier
// Bernhard Wodo Evan Balster "alxprd"@github
// Tom Beaumont Ingo Leitgeb Nicolas Guillemot
// Phillip Bennefall
// (If you reported a bug but do not appear in this list, it is because
// someone else reported the bug before you. There were too many of you to
// list them all because I was lax about updating for a long time, sorry.)
//
// Partial history:
// 1.07 - 2015/11/08 - fixes for crashes on invalid files
// 1.06 - 2015/08/31 - full, correct support for seeking API (Dougall Johnson)
// some crash fixes when out of memory or with corrupt files
// fix some inappropriately signed shifts
@ -1057,10 +1062,12 @@ static int compute_codewords(Codebook *c, uint8 *len, int n, uint32 *values)
while (z > 0 && !available[z]) --z;
if (z == 0) { return FALSE; }
res = available[z];
assert(z >= 0 && z < 32);
available[z] = 0;
add_entry(c, bit_reverse(res), i, m++, len[i], values);
// propogate availability up the tree
if (z != len[i]) {
assert(len[i] >= 0 && len[i] < 32);
for (y=len[i]; y > z; --y) {
assert(available[y] == 0);
available[y] = res + (1 << (32-y));
@ -1586,7 +1593,9 @@ static int codebook_decode_scalar_raw(vorb *f, Codebook *c)
int i;
prep_huffman(f);
assert(c->sorted_codewords || c->codewords);
if (c->codewords == NULL && c->sorted_codewords == NULL)
return -1;
// cases to use binary search: sorted_codewords && !c->codewords
// sorted_codewords && c->entries > 8
if (c->entries > 8 ? c->sorted_codewords!=NULL : !c->codewords) {
@ -3743,6 +3752,8 @@ static int start_decoder(vorb *f)
if (present) {
lengths[j] = get_bits(f, 5) + 1;
++total;
if (lengths[j] == 32)
return error(f, VORBIS_invalid_setup);
} else {
lengths[j] = NO_CODE;
}
@ -4012,6 +4023,7 @@ static int start_decoder(vorb *f)
r->part_size = get_bits(f,24)+1;
r->classifications = get_bits(f,6)+1;
r->classbook = get_bits(f,8);
if (r->classbook >= f->codebook_count) return error(f, VORBIS_invalid_setup);
for (j=0; j < r->classifications; ++j) {
uint8 high_bits=0;
uint8 low_bits=get_bits(f,3);

2
tests/test_vorbis.c
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@ -8,7 +8,7 @@ extern void stb_vorbis_dumpmem(void);
int main(int argc, char **argv)
{
size_t memlen;
unsigned char *mem = stb_fileu("c:/x/vorbis/5.ogg", &memlen);
unsigned char *mem = stb_fileu("c:/x/vorbis/stb_vorbis_crash.ogg", &memlen);
int chan, samplerate;
short *output;
int samples = stb_vorbis_decode_memory(mem, memlen, &chan, &samplerate, &output);