pixman: backport fix for CVE-2022-44638

(From OE-Core rev: 1d2e131d9ba55626354264d454b2808e84751600)

Signed-off-by: Ross Burton <ross.burton@arm.com>
Signed-off-by: Steve Sakoman <steve@sakoman.com>
(cherry picked from commit 23df4760ebc153c484d467e51b414910c570a6f8)
Signed-off-by: Steve Sakoman <steve@sakoman.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-graphics/xorg-lib/pixman/CVE-2022-44638.patch

@@ -0,0 +1,33 @@
+CVE: CVE-2022-44638
+Upstream-Status: Backport
+Signed-off-by: Ross Burton <ross.burton@arm.com>
+
+From a1f88e842e0216a5b4df1ab023caebe33c101395 Mon Sep 17 00:00:00 2001
+From: Matt Turner <mattst88@gmail.com>
+Date: Wed, 2 Nov 2022 12:07:32 -0400
+Subject: [PATCH] Avoid integer overflow leading to out-of-bounds write
+
+Thanks to Maddie Stone and Google's Project Zero for discovering this
+issue, providing a proof-of-concept, and a great analysis.
+
+Closes: https://gitlab.freedesktop.org/pixman/pixman/-/issues/63
+---
+ pixman/pixman-trap.c | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/pixman/pixman-trap.c b/pixman/pixman-trap.c
+index 91766fd..7560405 100644
+--- a/pixman/pixman-trap.c
++++ b/pixman/pixman-trap.c
+@@ -74,7 +74,7 @@ pixman_sample_floor_y (pixman_fixed_t y,
+ 
+     if (f < Y_FRAC_FIRST (n))
+     {
+-	if (pixman_fixed_to_int (i) == 0x8000)
++	if (pixman_fixed_to_int (i) == 0xffff8000)
+ 	{
+ 	    f = 0; /* saturate */
+ 	}
+-- 
+GitLab
+

meta/recipes-graphics/xorg-lib/pixman_0.40.0.bb

@@ -9,6 +9,7 @@ DEPENDS = "zlib"
 
 SRC_URI = "https://www.cairographics.org/releases/${BP}.tar.gz \
            file://0001-ARM-qemu-related-workarounds-in-cpu-features-detecti.patch \
+           file://CVE-2022-44638.patch \
            "
 SRC_URI[md5sum] = "73858c0862dd9896fb5f62ae267084a4"
 SRC_URI[sha256sum] = "6d200dec3740d9ec4ec8d1180e25779c00bc749f94278c8b9021f5534db223fc"