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