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fix invalid handling of truncated end-of-file indicator

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This commit is contained in:
Sean Barrett 2015-11-08 13:45:33 -08:00
parent 69a318bdb3
commit ea88e59b5d
2 changed files with 6 additions and 3 deletions
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7
stb_vorbis.c
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@ -906,7 +906,7 @@ static void *setup_malloc(vorb *f, int sz)
static void setup_free(vorb *f, void *p)
{
if (f->alloc.alloc_buffer) return; // do nothing; setup mem is not a stack
if (f->alloc.alloc_buffer) return; // do nothing; setup mem is a stack
free(p);
}
@ -3219,6 +3219,7 @@ static int vorbis_decode_initial(vorb *f, int *p_left_start, int *p_left_end, in
*p_right_start = window_center;
*p_right_end = n;
}
return TRUE;
}
@ -3457,7 +3458,7 @@ static int vorbis_decode_packet_rest(vorb *f, int *len, Mode *m, int left_start,
if (f->current_loc_valid && (f->page_flag & PAGEFLAG_last_page)) {
uint32 current_end = f->known_loc_for_packet - (n-right_end);
// then let's infer the size of the (probably) short final frame
if (current_end < f->current_loc + right_end) {
if (current_end < f->current_loc + (right_end-left_start)) {
if (current_end < f->current_loc) {
// negative truncation, that's impossible!
*len = 0;
@ -3465,6 +3466,7 @@ static int vorbis_decode_packet_rest(vorb *f, int *len, Mode *m, int left_start,
*len = current_end - f->current_loc;
}
*len += left_start;
if (*len > right_end) *len = right_end; // this should never happen
f->current_loc += *len;
return TRUE;
}
@ -3482,6 +3484,7 @@ static int vorbis_decode_packet_rest(vorb *f, int *len, Mode *m, int left_start,
if (f->alloc.alloc_buffer)
assert(f->alloc.alloc_buffer_length_in_bytes == f->temp_offset);
*len = right_end; // ignore samples after the window goes to 0
return TRUE;
}

2
tests/test_vorbis.c
View File

@ -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/4.ogg", &memlen);
unsigned char *mem = stb_fileu("c:/x/vorbis/5.ogg", &memlen);
int chan, samplerate;
short *output;
int samples = stb_vorbis_decode_memory(mem, memlen, &chan, &samplerate, &output);