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[bdf] Fix underflow of an unsigned value. 

bdflib.c:1562 could be reached with `font->glyphs_used == 0'.  That
caused an underflow of the unsigned value which results in undefined
behaviour.

* src/bdf/bdflib.c (src/bdf/bdflib.c): Bail out earlier than before
if the `ENCODING' keyword cannot be found.
This commit is contained in:
Armin Hasitzka 2018-06-17 20:27:42 +02:00
parent 19d8687f0b
commit 0f6be06444
2 changed files with 14 additions and 9 deletions
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11
ChangeLog
View File

@ -1,3 +1,14 @@
2018-06-17 Armin Hasitzka <prince.cherusker@gmail.com>
[bdf] Fix underflow of an unsigned value.
bdflib.c:1562 could be reached with `font->glyphs_used == 0'. That
caused an underflow of the unsigned value which results in undefined
behaviour.
* src/bdf/bdflib.c (src/bdf/bdflib.c): Bail out earlier than before
if the `ENCODING' keyword cannot be found.
2018-06-17 Werner Lemberg <wl@gnu.org>
[base] Add tracing for `FT_Bitmap_Blend'.

12
src/bdf/bdflib.c
View File

@ -1556,6 +1556,9 @@
goto Exit;
}
if ( !( p->flags & BDF_ENCODING_ ) )
goto Missing_Encoding;
/* Point at the glyph being constructed. */
if ( p->glyph_enc == -1 )
glyph = font->unencoded + ( font->unencoded_used - 1 );
@ -1626,9 +1629,6 @@
/* Expect the SWIDTH (scalable width) field next. */
if ( _bdf_strncmp( line, "SWIDTH", 6 ) == 0 )
{
if ( !( p->flags & BDF_ENCODING_ ) )
goto Missing_Encoding;
error = _bdf_list_split( &p->list, (char *)" +", line, linelen );
if ( error )
goto Exit;
@ -1642,9 +1642,6 @@
/* Expect the DWIDTH (scalable width) field next. */
if ( _bdf_strncmp( line, "DWIDTH", 6 ) == 0 )
{
if ( !( p->flags & BDF_ENCODING_ ) )
goto Missing_Encoding;
error = _bdf_list_split( &p->list, (char *)" +", line, linelen );
if ( error )
goto Exit;
@ -1670,9 +1667,6 @@
/* Expect the BBX field next. */
if ( _bdf_strncmp( line, "BBX", 3 ) == 0 )
{
if ( !( p->flags & BDF_ENCODING_ ) )
goto Missing_Encoding;
error = _bdf_list_split( &p->list, (char *)" +", line, linelen );
if ( error )
goto Exit;