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

