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Update DUMB to revision 7ad496ecf2fd658a51de55df0e7f0257025038cc

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- Added sanity checking to XM reader instrument and sample header sizes
    - Added footer tag checking to prevent tags from reaching the module reader



SVN r4093 (trunk)
This commit is contained in:
Randy Heit 2013-02-08 00:41:29 +00:00
parent 4163817eda
commit b7f4f498ff
1 changed files with 19 additions and 2 deletions
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21
dumb/src/it/readxm.c
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@ -400,6 +400,13 @@ static int limit_xm_resize(void *f, long n)
return 0;
}
static int limit_xm_skip_end(void *f, long n)
{
DUMBFILE *df = f;
LIMITED_XM *lx = df->file;
return dumbfile_skip( lx->remaining, n );
}
static int limit_xm_skip(void *f, long n)
{
LIMITED_XM *lx = f;
@ -476,6 +483,8 @@ static int it_xm_read_instrument(IT_INSTRUMENT *instrument, XM_INSTRUMENT_EXTRA
unsigned short vol_points[24];
unsigned short pan_points[24];
int i, type;
const unsigned long max_size = 4 + 22 + 1 + 2 + 4 + 96 + 48 + 48 + 1 * 14 + 2 + 2;
unsigned long skip_end = 0;
/* Header size. Tends to be more than the actual size of the structure.
* So unread bytes must be skipped before reading the first sample
@ -486,7 +495,12 @@ static int it_xm_read_instrument(IT_INSTRUMENT *instrument, XM_INSTRUMENT_EXTRA
size = dumbfile_igetl(f);
if ( size == 0 ) size = 4 + 22 + 1 + 2 + 4 + 96 + 48 + 48 + 1 * 14 + 2 + 2;
if ( size == 0 ) size = max_size;
else if ( size > max_size )
{
skip_end = size - max_size;
size = max_size;
}
if ( limit_xm_resize( f, size - 4 ) < 0 ) return -1;
@ -504,7 +518,7 @@ static int it_xm_read_instrument(IT_INSTRUMENT *instrument, XM_INSTRUMENT_EXTRA
if (extra->n_samples) {
/* sample header size */
i = dumbfile_igetl(f);
if (!i) i = 0x28;
if (!i || i > 0x28) i = 0x28;
extra->sample_header_size = i;
/* sample map */
@ -594,6 +608,9 @@ static int it_xm_read_instrument(IT_INSTRUMENT *instrument, XM_INSTRUMENT_EXTRA
if (size > bytes_read && dumbfile_skip(f, size - bytes_read))
return -1;
if (skip_end && limit_xm_skip_end(f, skip_end))
return -1;
instrument->new_note_action = NNA_NOTE_CUT;
instrument->dup_check_type = DCT_OFF;
instrument->dup_check_action = DCA_NOTE_CUT;