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xcb: Add dimension guards to create-similar-image

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Just create a image wrapper for a 0x0 surface, and do not try to create
an image surface that is larger than the maximum X coordinate.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
This commit is contained in:
Chris Wilson 2012-01-11 12:39:17 +00:00
parent 5045155de6
commit 9e4fb906b8
1 changed files with 7 additions and 0 deletions
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7
src/cairo-xcb-surface.c
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@ -172,6 +172,12 @@ _cairo_xcb_surface_create_similar_image (void *abstract_other,
cairo_status_t status;
pixman_format_code_t pixman_format;
if (unlikely(width > XLIB_COORD_MAX ||
height > XLIB_COORD_MAX ||
width <= 0 ||
height <= 0))
return NULL;
pixman_format = _cairo_format_to_pixman_format_code (format);
status = _cairo_xcb_shm_image_create (connection, pixman_format,
@ -179,6 +185,7 @@ _cairo_xcb_surface_create_similar_image (void *abstract_other,
&shm_info);
if (unlikely (status))
return _cairo_surface_create_in_error (status);
return &image->base;
}