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[winfonts] Avoid zero bitmap width and height. 

Reported as

  https://bugzilla.mozilla.org/show_bug.cgi?id=1272173

* src/winfonts/winfnt.c (FNT_Face_Init): Check zero pixel height.
(FNT_Load_Glyph): Check for zero pitch.
This commit is contained in:
Werner Lemberg 2016-08-13 06:53:53 +02:00
parent 125f2b63a5
commit 248f5629d8
2 changed files with 21 additions and 1 deletions
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11
ChangeLog
View File

@ -1,3 +1,14 @@
2016-08-13 Werner Lemberg <wl@gnu.org>
[winfonts] Avoid zero bitmap width and height.
Reported as
https://bugzilla.mozilla.org/show_bug.cgi?id=1272173
* src/winfonts/winfnt.c (FNT_Face_Init): Check zero pixel height.
(FNT_Load_Glyph): Check for zero pitch.
2016-08-11 Alexei Podtelezhnikov <apodtele@gmail.com> 2016-08-11 Alexei Podtelezhnikov <apodtele@gmail.com>
* src/truetype/ttinterp.c (Pop_Push_Count): Revert changes. * src/truetype/ttinterp.c (Pop_Push_Count): Revert changes.

11
src/winfonts/winfnt.c
View File

@ -759,6 +759,14 @@
if ( error ) if ( error )
goto Fail; goto Fail;
/* sanity check */
if ( !face->font->header.pixel_height )
{
FT_TRACE2(( "invalid pixel height\n" ));
error = FT_THROW( Invalid_File_Format );
goto Fail;
}
/* we now need to fill the root FT_Face fields */ /* we now need to fill the root FT_Face fields */
/* with relevant information */ /* with relevant information */
{ {
@ -1062,7 +1070,8 @@
bitmap->rows = font->header.pixel_height; bitmap->rows = font->header.pixel_height;
bitmap->pixel_mode = FT_PIXEL_MODE_MONO; bitmap->pixel_mode = FT_PIXEL_MODE_MONO;
if ( offset + pitch * bitmap->rows > font->header.file_size ) if ( !pitch ||
offset + pitch * bitmap->rows > font->header.file_size )
{ {
FT_TRACE2(( "invalid bitmap width\n" )); FT_TRACE2(( "invalid bitmap width\n" ));
error = FT_THROW( Invalid_File_Format ); error = FT_THROW( Invalid_File_Format );