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[sfnt] Fix Savannah bug #43588. 

* src/sfnt/ttcmap.c (tt_cmap8_validate, tt_cmap10_validate,
tt_cmap12_validate, tt_cmap13_validate, tt_cmap14_validate): Protect
against overflow in additions and multiplications.
This commit is contained in:
Werner Lemberg 2014-11-12 20:51:20 +01:00
parent 2e73a1b4fd
commit 602040b111
2 changed files with 41 additions and 12 deletions
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14
ChangeLog
View File

@ -1,3 +1,11 @@
2014-11-12 Werner Lemberg <wl@gnu.org>
[sfnt] Fix Savannah bug #43588.
* src/sfnt/ttcmap.c (tt_cmap8_validate, tt_cmap10_validate,
tt_cmap12_validate, tt_cmap13_validate, tt_cmap14_validate): Protect
against overflow in additions and multiplications.
2014-11-10 Alexei Podtelezhnikov <apodtele@gmail.com> 2014-11-10 Alexei Podtelezhnikov <apodtele@gmail.com>
[base] CORDIC improvements. [base] CORDIC improvements.
@ -20,7 +28,7 @@
2014-11-07 Werner Lemberg <wl@gnu.org> 2014-11-07 Werner Lemberg <wl@gnu.org>
Fix Savannah bug #43535. [bdf] Fix Savannah bug #43535.
* src/bdf/bdflib.c (_bdf_strncmp): New macro that checks one * src/bdf/bdflib.c (_bdf_strncmp): New macro that checks one
character more than `strncmp'. character more than `strncmp'.
@ -28,14 +36,14 @@
2014-11-06 Werner Lemberg <wl@gnu.org> 2014-11-06 Werner Lemberg <wl@gnu.org>
Fix Savannah bug #43548. [pcf] Fix Savannah bug #43548.
* src/pcf/pcfread.c (pcf_get_encodings): Add sanity checks for row * src/pcf/pcfread.c (pcf_get_encodings): Add sanity checks for row
and column values. and column values.
2014-11-06 Werner Lemberg <wl@gnu.org> 2014-11-06 Werner Lemberg <wl@gnu.org>
Fix Savannah bug #43547. [pcf] Fix Savannah bug #43547.
* src/pcf/pcfread.c (pcf_read_TOC): Check `size' and `offset' * src/pcf/pcfread.c (pcf_read_TOC): Check `size' and `offset'
values. values.

39
src/sfnt/ttcmap.c
View File

@ -1669,7 +1669,8 @@
p = is32 + 8192; /* skip `is32' array */ p = is32 + 8192; /* skip `is32' array */
num_groups = TT_NEXT_ULONG( p ); num_groups = TT_NEXT_ULONG( p );
if ( p + num_groups * 12 > valid->limit ) /* p + num_groups * 12 > valid->limit ? */
if ( num_groups > (FT_UInt32)( valid->limit - p ) / 12 )
FT_INVALID_TOO_SHORT; FT_INVALID_TOO_SHORT;
/* check groups, they must be in increasing order */ /* check groups, they must be in increasing order */
@ -1694,7 +1695,12 @@
if ( valid->level >= FT_VALIDATE_TIGHT ) if ( valid->level >= FT_VALIDATE_TIGHT )
{ {
if ( start_id + end - start >= TT_VALID_GLYPH_COUNT( valid ) ) FT_UInt32 d = end - start;
/* start_id + end - start >= TT_VALID_GLYPH_COUNT( valid ) ? */
if ( d > TT_VALID_GLYPH_COUNT( valid ) ||
start_id >= TT_VALID_GLYPH_COUNT( valid ) - d )
FT_INVALID_GLYPH_ID; FT_INVALID_GLYPH_ID;
count = (FT_UInt32)( end - start + 1 ); count = (FT_UInt32)( end - start + 1 );
@ -1892,7 +1898,9 @@
count = TT_NEXT_ULONG( p ); count = TT_NEXT_ULONG( p );
if ( length > (FT_ULong)( valid->limit - table ) || if ( length > (FT_ULong)( valid->limit - table ) ||
length < 20 + count * 2 ) /* length < 20 + count * 2 ? */
length < 20 ||
( length - 20 ) / 2 < count )
FT_INVALID_TOO_SHORT; FT_INVALID_TOO_SHORT;
/* check glyph indices */ /* check glyph indices */
@ -2079,7 +2087,9 @@
num_groups = TT_NEXT_ULONG( p ); num_groups = TT_NEXT_ULONG( p );
if ( length > (FT_ULong)( valid->limit - table ) || if ( length > (FT_ULong)( valid->limit - table ) ||
length < 16 + 12 * num_groups ) /* length < 16 + 12 * num_groups ? */
length < 16 ||
( length - 16 ) / 12 < num_groups )
FT_INVALID_TOO_SHORT; FT_INVALID_TOO_SHORT;
/* check groups, they must be in increasing order */ /* check groups, they must be in increasing order */
@ -2101,7 +2111,12 @@
if ( valid->level >= FT_VALIDATE_TIGHT ) if ( valid->level >= FT_VALIDATE_TIGHT )
{ {
if ( start_id + end - start >= TT_VALID_GLYPH_COUNT( valid ) ) FT_UInt32 d = end - start;
/* start_id + end - start >= TT_VALID_GLYPH_COUNT( valid ) ? */
if ( d > TT_VALID_GLYPH_COUNT( valid ) ||
start_id >= TT_VALID_GLYPH_COUNT( valid ) - d )
FT_INVALID_GLYPH_ID; FT_INVALID_GLYPH_ID;
} }
@ -2401,7 +2416,9 @@
num_groups = TT_NEXT_ULONG( p ); num_groups = TT_NEXT_ULONG( p );
if ( length > (FT_ULong)( valid->limit - table ) || if ( length > (FT_ULong)( valid->limit - table ) ||
length < 16 + 12 * num_groups ) /* length < 16 + 12 * num_groups ? */
length < 16 ||
( length - 16 ) / 12 < num_groups )
FT_INVALID_TOO_SHORT; FT_INVALID_TOO_SHORT;
/* check groups, they must be in increasing order */ /* check groups, they must be in increasing order */
@ -2787,7 +2804,9 @@
num_selectors = TT_NEXT_ULONG( p ); num_selectors = TT_NEXT_ULONG( p );
if ( length > (FT_ULong)( valid->limit - table ) || if ( length > (FT_ULong)( valid->limit - table ) ||
length < 10 + 11 * num_selectors ) /* length < 10 + 11 * num_selectors ? */
length < 10 ||
( length - 10 ) / 11 < num_selectors )
FT_INVALID_TOO_SHORT; FT_INVALID_TOO_SHORT;
/* check selectors, they must be in increasing order */ /* check selectors, they must be in increasing order */
@ -2823,7 +2842,8 @@
FT_ULong lastBase = 0; FT_ULong lastBase = 0;
if ( defp + numRanges * 4 > valid->limit ) /* defp + numRanges * 4 > valid->limit ? */
if ( numRanges > (FT_ULong)( valid->limit - defp ) / 4 )
FT_INVALID_TOO_SHORT; FT_INVALID_TOO_SHORT;
for ( i = 0; i < numRanges; ++i ) for ( i = 0; i < numRanges; ++i )
@ -2850,7 +2870,8 @@
FT_ULong i, lastUni = 0; FT_ULong i, lastUni = 0;
if ( numMappings * 4 > (FT_ULong)( valid->limit - ndp ) ) /* numMappings * 4 > (FT_ULong)( valid->limit - ndp ) ? */
if ( numMappings > ( (FT_ULong)( valid->limit - ndp ) ) / 4 )
FT_INVALID_TOO_SHORT; FT_INVALID_TOO_SHORT;
for ( i = 0; i < numMappings; ++i ) for ( i = 0; i < numMappings; ++i )