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* src/cid/cidgload.c (cid_glyph_load): Check file offsets (#46222).

This commit is contained in:
Werner Lemberg 2015-10-17 09:11:02 +02:00
parent 8edfcbed53
commit 0ba98da472
2 changed files with 16 additions and 7 deletions
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4
ChangeLog
View File

@ -1,3 +1,7 @@
2015-10-17 Werner Lemberg <wl@gnu.org>
* src/cid/cidgload.c (cid_glyph_load): Check file offsets (#46222).
2015-10-17 Werner Lemberg <wl@gnu.org>
[psaux] Fix heap buffer overflow (#46221).

19
src/cid/cidgload.c
View File

@ -100,7 +100,7 @@
/* and charstring offset from the CIDMap. */
{
FT_UInt entry_len = (FT_UInt)( cid->fd_bytes + cid->gd_bytes );
FT_ULong off1;
FT_ULong off1, off2;
if ( FT_STREAM_SEEK( cid->data_offset + cid->cidmap_offset +
@ -108,18 +108,23 @@
FT_FRAME_ENTER( 2 * entry_len ) )
goto Exit;
p = (FT_Byte*)stream->cursor;
fd_select = cid_get_offset( &p, (FT_Byte)cid->fd_bytes );
off1 = cid_get_offset( &p, (FT_Byte)cid->gd_bytes );
p += cid->fd_bytes;
glyph_length = cid_get_offset( &p, (FT_Byte)cid->gd_bytes ) - off1;
p = (FT_Byte*)stream->cursor;
fd_select = cid_get_offset( &p, (FT_Byte)cid->fd_bytes );
off1 = cid_get_offset( &p, (FT_Byte)cid->gd_bytes );
p += cid->fd_bytes;
off2 = cid_get_offset( &p, (FT_Byte)cid->gd_bytes );
FT_FRAME_EXIT();
if ( fd_select >= (FT_ULong)cid->num_dicts )
if ( fd_select >= (FT_ULong)cid->num_dicts ||
off2 >= stream->size ||
off1 > off2 )
{
FT_TRACE0(( "cid_load_glyph: invalid glyph stream offsets\n" ));
error = FT_THROW( Invalid_Offset );
goto Exit;
}
glyph_length = off2 - off1;
if ( glyph_length == 0 )
goto Exit;
if ( FT_ALLOC( charstring, glyph_length ) )