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Integer underflow in the xTrapezoidValid macro in render/picture.h in X.Org allows context-dependent attackers to cause a denial of service (crash) via a negative bottom value. http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2013-6424 (From OE-Core rev: 059dc5f4ef9bcf49cb6520f5f2ab1e739f4d42de) Signed-off-by: Baogen Shang <baogen.shang@windriver.com> Signed-off-by: Kai Kang <kai.kang@windriver.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>