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Fix CVE-2016-5296: Heap-buffer-overflow WRITE in rasterize_edges_1
Adapted for upstream pixman based on:
https://hg.mozilla.org/releases/mozilla-esr45/rev/5e39c1c2fded
--- pixman-0.34.0/pixman/pixman-edge-imp.h.orig 2015-06-30 05:48:31.000000000 -0400
+++ pixman-0.34.0/pixman/pixman-edge-imp.h 2016-11-16 01:09:34.046335106 -0500
@@ -55,8 +55,9 @@
*
* (The AA case does a similar adjustment in RENDER_SAMPLES_X)
*/
- lx += X_FRAC_FIRST(1) - pixman_fixed_e;
- rx += X_FRAC_FIRST(1) - pixman_fixed_e;
+ /* we cast to unsigned to get defined behaviour for overflow */
+ lx = (unsigned)lx + X_FRAC_FIRST(1) - pixman_fixed_e;
+ rx = (unsigned)rx + X_FRAC_FIRST(1) - pixman_fixed_e;
#endif
/* clip X */
if (lx < 0)
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