Integer underflow in the pixman_trapezoid_valid macro in pixman.h in
Pixman before 0.32.0, as used in X.Org server and cairo, allows
context-dependent attackers to cause a denial of service (crash) via a
negative bottom value.
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MLIST:[Pixman] 20131110 [ANNOUNCE] pixman release 0.32.0 now available
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