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* src/sfnt/ttcolr.c (read_paint): Fix undefined left-shift operation. 

Reported as

  https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=43151
This commit is contained in:
Werner Lemberg 2022-01-09 07:26:26 +01:00
parent 639a02154b
commit 947fddc8da
1 changed files with 12 additions and 2 deletions
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14
src/sfnt/ttcolr.c
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@ -522,19 +522,29 @@
else if ( apaint->format == FT_COLR_PAINTFORMAT_RADIAL_GRADIENT ) else if ( apaint->format == FT_COLR_PAINTFORMAT_RADIAL_GRADIENT )
{ {
FT_Pos tmp;
if ( !read_color_line( child_table_p, if ( !read_color_line( child_table_p,
&apaint->u.radial_gradient.colorline ) ) &apaint->u.radial_gradient.colorline ) )
return 0; return 0;
/* In the OpenType specification, `r0` and `r1` are defined as */
/* `UFWORD`. Since FreeType doesn't have a corresponding 16.16 */
/* format we convert to `FWORD` and replace negative values with */
/* (32bit) `FT_INT_MAX`. */
apaint->u.radial_gradient.c0.x = INT_TO_FIXED( FT_NEXT_SHORT( p ) ); apaint->u.radial_gradient.c0.x = INT_TO_FIXED( FT_NEXT_SHORT( p ) );
apaint->u.radial_gradient.c0.y = INT_TO_FIXED( FT_NEXT_SHORT( p ) ); apaint->u.radial_gradient.c0.y = INT_TO_FIXED( FT_NEXT_SHORT( p ) );
apaint->u.radial_gradient.r0 = FT_NEXT_USHORT( p ) << 16; tmp = INT_TO_FIXED( FT_NEXT_SHORT( p ) );
apaint->u.radial_gradient.r0 = tmp < 0 ? FT_INT_MAX : tmp;
apaint->u.radial_gradient.c1.x = INT_TO_FIXED( FT_NEXT_SHORT( p ) ); apaint->u.radial_gradient.c1.x = INT_TO_FIXED( FT_NEXT_SHORT( p ) );
apaint->u.radial_gradient.c1.y = INT_TO_FIXED( FT_NEXT_SHORT( p ) ); apaint->u.radial_gradient.c1.y = INT_TO_FIXED( FT_NEXT_SHORT( p ) );
apaint->u.radial_gradient.r1 = FT_NEXT_USHORT( p ) << 16; tmp = INT_TO_FIXED( FT_NEXT_SHORT( p ) );
apaint->u.radial_gradient.r1 = tmp < 0 ? FT_INT_MAX : tmp;
return 1; return 1;
} }