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ofz#50805 crash seen in fuzzing libreoffice text rendering

Caolán McNamara requested to merge caolanm/cairo:ofz50805 into master 
backtrace:
 pixman_image_get_format /work/workdir/UnpackedTarball/pixman/pixman/pixman-image.c:939:16
 _cairo_ft_scaled_glyph_init_surface /work/workdir/UnpackedTarball/cairo/src/cairo-ft-font.c:2574:9
 _cairo_ft_scaled_glyph_init /work/workdir/UnpackedTarball/cairo/src/cairo-ft-font.c:2754:11
 _cairo_scaled_glyph_lookup /work/workdir/UnpackedTarball/cairo/src/cairo-scaled-font.c:3073:11
 composite_glyphs /work/workdir/UnpackedTarball/cairo/src/cairo-image-compositor.c:910:15
 composite_glyphs /work/workdir/UnpackedTarball/cairo/src/cairo-traps-compositor.c:2295:12
 clip_and_composite /work/workdir/UnpackedTarball/cairo/src/cairo-traps-compositor.c:1049:15
 _cairo_traps_compositor_glyphs /work/workdir/UnpackedTarball/cairo/src/cairo-traps-compositor.c:2331:11
 _cairo_compositor_glyphs /work/workdir/UnpackedTarball/cairo/src/cairo-compositor.c:292:11
 _cairo_image_surface_glyphs /work/workdir/UnpackedTarball/cairo/src/cairo-image-surface.c:1030:12
 _cairo_surface_show_text_glyphs /work/workdir/UnpackedTarball/cairo/src/cairo-surface.c:2920:15
 _cairo_gstate_show_text_glyphs /work/workdir/UnpackedTarball/cairo/src/cairo-gstate.c:0
 cairo_show_glyphs /work/workdir/UnpackedTarball/cairo/src/cairo.c:3670:14
 CairoTextRender::DrawTextLayout(GenericSalLayout const&, SalGraphics const&) /src/libreoffice/vcl/unx/generic/gdi/cairotextrender.cxx:337:9

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