segfault in cairo-xcb-surface-render.c

Hello all,

when using a Firefox compiled against cairo 1.12.16 I get a segfault
when visiting some webpages, eg when scrolling an expose on
www.immobilienscout24.de.

debugging the problem with gdb led me to line 3125 of
cairo-xcb-surface-render.c:

_cairo_clip_path_destroy (clip->path);

where on that webpage for reasons I don't know clip->path = NULL

I changed the line to

if (clip->path != NULL) _cairo_clip_path_destroy (clip->path);

which fixes the segfault.

See patch below:

 cat /usr/src/blfs-src/cairo-1.12.16-fix-segfault.patch
--- cairo-1.12.16/src/cairo-xcb-surface-render.c-orig   2014-05-01
13:31:53.386347915 +0200
+++ cairo-1.12.16/src/cairo-xcb-surface-render.c        2014-05-01
13:32:12.099032718 +0200
@@ -3123,7 +3123,7 @@
        clip = _cairo_clip_intersect_boxes (clip, boxes);
        status = _cairo_clip_get_polygon (clip, &polygon,
                                          &fill_rule, &antialias);
-       _cairo_clip_path_destroy (clip->path);
+       if (clip->path != NULL) _cairo_clip_path_destroy (clip->path);
        clip->path = NULL;
        if (likely (status == CAIRO_INT_STATUS_SUCCESS)) {
            cairo_clip_t *saved_clip = extents->clip;


regards,

thorsten

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