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[cache] Fix a possible overflow by signed integer comparison. 

Improve the code by 5d3ff05615 ,
issues are found by Behdad Esfahbod and Werner Lemberg.

* src/cache/ftcbasic.c (FTC_ImageCache_Lookup): Replace
a subtraction to check higher bit by a bit operation,
and cpp-conditionalize for appropriate systems.  Add better
documentation to the comment.
(FTC_ImageCache_LookupScaler): Ditto.
(FTC_SBitCache_Lookup): Ditto.
(FTC_SBitCache_LookupScaler): Ditto.
This commit is contained in:
suzuki toshiya 2017-09-13 15:49:15 +09:00
parent 96dcc8ad6e
commit 5ad845771a
2 changed files with 53 additions and 4 deletions
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15
ChangeLog
View File

@ -1,3 +1,18 @@
2017-09-13 suzuki toshiya <mpsuzuki@hiroshima-u.ac.jp>
[cache] Fix a possible overflow by signed integer comparison.
Improve the code by 5d3ff05615dda6d1325ed612381a17a0df04c975 ,
issues are found by Behdad Esfahbod and Werner Lemberg.
* src/cache/ftcbasic.c (FTC_ImageCache_Lookup): Replace
a subtraction to check higher bit by a bit operation,
and cpp-conditionalize for appropriate systems. Add better
documentation to the comment.
(FTC_ImageCache_LookupScaler): Ditto.
(FTC_SBitCache_Lookup): Ditto.
(FTC_SBitCache_LookupScaler): Ditto.
2017-09-13 Werner Lemberg <wl@gnu.org>
[autofit] Really fix #41334 (#52000).

42
src/cache/ftcbasic.c vendored
View File

@ -304,10 +304,19 @@
if ( anode )
*anode = NULL;
if ( (FT_ULong)( type->flags - FT_INT_MIN ) > FT_UINT_MAX )
/*
* internal FTC_BasicAttr->load_flags is typed FT_UInt,
* but public FT_ImageType->flags is typed FT_Int32
*
* On 16bit systems, higher bits of type->flags
* could not be handled.
*/
#if 0xFFFFFFFFUL > FT_UINT_MAX
if ( (type->flags & (FT_ULong)FT_UINT_MAX) )
FT_TRACE1(( "FTC_ImageCache_Lookup:"
" higher bits in load_flags 0x%x are dropped\n",
(FT_ULong)type->flags & ~((FT_ULong)FT_UINT_MAX) ));
#endif
query.attrs.scaler.face_id = type->face_id;
query.attrs.scaler.width = type->width;
@ -377,11 +386,19 @@
if ( anode )
*anode = NULL;
/* `FT_Load_Glyph' and `FT_Load_Char' take FT_UInt flags */
/*
* internal FTC_BasicAttr->load_flags is typed FT_UInt,
* but public FT_Face->face_flags is typed FT_Long.
*
* On long > int systems, higher bits of load_flags
* could not be handled.
*/
#if FT_ULONG_MAX > FT_UINT_MAX
if ( load_flags > FT_UINT_MAX )
FT_TRACE1(( "FTC_ImageCache_LookupScaler:"
" higher bits in load_flags 0x%x are dropped\n",
load_flags & ~((FT_ULong)FT_UINT_MAX) ));
#endif
query.attrs.scaler = scaler[0];
query.attrs.load_flags = (FT_UInt)load_flags;
@ -487,10 +504,19 @@
*ansbit = NULL;
if ( (FT_ULong)( type->flags - FT_INT_MIN ) > FT_UINT_MAX )
/*
* internal FTC_BasicAttr->load_flags is typed FT_UInt,
* but public FT_ImageType->flags is typed FT_Int32
*
* On 16bit systems, higher bits of type->flags
* could not be handled.
*/
#if 0xFFFFFFFFUL > FT_UINT_MAX
if ( (type->flags & (FT_ULong)FT_UINT_MAX) )
FT_TRACE1(( "FTC_ImageCache_Lookup:"
" higher bits in load_flags 0x%x are dropped\n",
(FT_ULong)type->flags & ~((FT_ULong)FT_UINT_MAX) ));
#endif
query.attrs.scaler.face_id = type->face_id;
query.attrs.scaler.width = type->width;
@ -562,11 +588,19 @@
*ansbit = NULL;
/* `FT_Load_Glyph' and `FT_Load_Char' take FT_UInt flags */
/*
* internal FTC_BasicAttr->load_flags is typed FT_UInt,
* but public FT_Face->face_flags is typed FT_Long.
*
* On long > int systems, higher bits of load_flags
* could not be handled.
*/
#if FT_ULONG_MAX > FT_UINT_MAX
if ( load_flags > FT_UINT_MAX )
FT_TRACE1(( "FTC_ImageCache_LookupScaler:"
" higher bits in load_flags 0x%x are dropped\n",
load_flags & ~((FT_ULong)FT_UINT_MAX) ));
#endif
query.attrs.scaler = scaler[0];
query.attrs.load_flags = (FT_UInt)load_flags;