ghostscript: backport fix for CVE-2023-38559

(From OE-Core rev: 38478a82598260e5e0616598e8cf78416dac1867)

Signed-off-by: Ross Burton <ross.burton@arm.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 31 insertions, 0 deletions

diff --git a/meta/recipes-extended/ghostscript/ghostscript/0001-Bug-706897-Copy-pcx-buffer-overrun-fix-from-devices-.patch b/meta/recipes-extended/ghostscript/ghostscript/0001-Bug-706897-Copy-pcx-buffer-overrun-fix-from-devices-.patch
new file mode 100644
index 0000000000..b29212fbc6
--- /dev/null
+++ b/meta/recipes-extended/ghostscript/ghostscript/0001-Bug-706897-Copy-pcx-buffer-overrun-fix-from-devices-.patch
@@ -0,0 +1,31 @@
+From d81b82c70bc1fb9991bb95f1201abb5dea55f57f Mon Sep 17 00:00:00 2001
+From: Chris Liddell <chris.liddell@artifex.com>
+Date: Mon, 17 Jul 2023 14:06:37 +0100
+Subject: [PATCH] Bug 706897: Copy pcx buffer overrun fix from
+ devices/gdevpcx.c
+
+Bounds check the buffer, before dereferencing the pointer.
+
+CVE: CVE-2023-38559
+Upstream-Status: Backport
+Signed-off-by: Ross Burton <ross.burton@arm.com>
+---
+ base/gdevdevn.c | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/base/gdevdevn.c b/base/gdevdevn.c
+index 7b14d9c71..6351fb77a 100644
+--- a/base/gdevdevn.c
++++ b/base/gdevdevn.c
+@@ -1983,7 +1983,7 @@ devn_pcx_write_rle(const byte * from, const byte * end, int step, gp_file * file
+         byte data = *from;
+ 
+         from += step;
+-        if (data != *from || from == end) {
++        if (from >= end || data != *from) {
+             if (data >= 0xc0)
+                 gp_fputc(0xc1, file);
+         } else {
+-- 
+2.34.1
+