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Fix access to uninitalized memory (#52613). 

Also reported as

  https://bugs.chromium.org/p/chromium/issues/detail?id=791317

* src/base/ftbitmap.c (ft_bitmap_assure_buffer): If increasing the
bitmap size needs a larger bitmap buffer, assure that the new memory
areas are initialized also.
This commit is contained in:
Werner Lemberg 2017-12-08 09:54:36 +01:00
parent 99df4919fd
commit e1090c608b
2 changed files with 47 additions and 8 deletions
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12
ChangeLog
View File

@ -1,3 +1,15 @@
2017-12-08 Werner Lemberg <wl@gnu.org>
Fix access to uninitalized memory (#52613).
Also reported as
https://bugs.chromium.org/p/chromium/issues/detail?id=791317
* src/base/ftbitmap.c (ft_bitmap_assure_buffer): If increasing the
bitmap size needs a larger bitmap buffer, assure that the new memory
areas are initialized also.
2017-12-08 Werner Lemberg <wl@gnu.org>
Fix `make setup dos' (#52622).

43
src/base/ftbitmap.c
View File

@ -235,21 +235,48 @@
{
FT_UInt len = ( width * bpp + 7 ) >> 3;
unsigned char* in = bitmap->buffer;
unsigned char* out = buffer;
for ( i = 0; i < bitmap->rows; i++ )
FT_MEM_COPY( buffer + (FT_UInt)new_pitch * ( ypixels + i ),
bitmap->buffer + (FT_UInt)pitch * i,
len );
unsigned char* limit = bitmap->buffer + pitch * bitmap->rows;
int delta = new_pitch - pitch;
FT_MEM_ZERO( out, new_pitch * ypixels );
out += new_pitch * ypixels;
while ( in < limit )
{
FT_MEM_COPY( out, in, len );
in += pitch;
out += pitch;
FT_MEM_ZERO( out, delta );
out += delta;
}
}
else
{
FT_UInt len = ( width * bpp + 7 ) >> 3;
unsigned char* in = bitmap->buffer;
unsigned char* out = buffer;
for ( i = 0; i < bitmap->rows; i++ )
FT_MEM_COPY( buffer + (FT_UInt)new_pitch * i,
bitmap->buffer + (FT_UInt)pitch * i,
len );
unsigned char* limit = bitmap->buffer + pitch * bitmap->rows;
int delta = new_pitch - pitch;
while ( in < limit )
{
FT_MEM_COPY( out, in, len );
in += pitch;
out += pitch;
FT_MEM_ZERO( out, delta );
out += delta;
}
FT_MEM_ZERO( out, new_pitch * ypixels );
}
FT_FREE( bitmap->buffer );