!21 [sync] PR-19: 修复空指针反引用问题

From: @openeuler-sync-bot 
Reviewed-by: @liuzhiqiang26 
Signed-off-by: @liuzhiqiang26

0006-pseudo-fix-possible-dereference-of-NULL-pointer.patch

@@ -0,0 +1,25 @@
+From 787faa3201b923cb91c74bc31c9f59610aca52e2 Mon Sep 17 00:00:00 2001
+From: Phillip Lougher <phillip@squashfs.org.uk>
+Date: Wed, 14 Sep 2022 21:23:24 +0100
+Subject: [PATCH] pseudo: fix possible dereference of NULL pointer
+
+Signed-off-by: Phillip Lougher <phillip@squashfs.org.uk>
+---
+ squashfs-tools/pseudo.c | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/squashfs-tools/pseudo.c b/squashfs-tools/pseudo.c
+index 5f18bf1..942b98b 100644
+--- a/squashfs-tools/pseudo.c
++++ b/squashfs-tools/pseudo.c
+@@ -472,7 +472,7 @@ static int read_pseudo_def_pseudo_link(char *orig_def, char *filename, char *nam
+ 	else
+ 		pseudo_ent = pseudo_lookup(pseudo, link);
+ 
+-	if(pseudo_ent == NULL) {
++	if(pseudo_ent == NULL || pseudo_ent->dev == NULL) {
+ 		ERROR("Pseudo LINK file %s doesn't exist\n", linkname);
+ 		goto error;
+ 	}
+-- 
+2.37.0.windows.1

squashfs-tools.spec

@@ -1,6 +1,6 @@
 Name:     squashfs-tools
 Version:  4.5
-Release:  1
+Release:  2
 Summary:  Utility for the squashfs filesystems
 License:  GPLv2+
 URL:      http://squashfs.sourceforge.net/
@@ -12,6 +12,7 @@ Patch2:  0002-CVE-2021-41072.patch
 Patch3:  0003-CVE-2021-41072.patch
 Patch4:  0004-CVE-2021-41072.patch
 Patch5:  0005-CVE-2021-41072.patch
+Patch6:  0006-pseudo-fix-possible-dereference-of-NULL-pointer.patch
 
 BuildRequires: zlib-devel xz-devel libzstd-devel 
 BuildRequires: lzo-devel libattr-devel lz4-devel gcc
@@ -42,6 +43,9 @@ install -D -m 755 squashfs-tools/unsquashfs %{buildroot}%{_sbindir}/unsquashfs
 
 
 %changelog
+* Thu Oct 20 2022 lihaoxiang <lihaoxiang9@huawei.com> - 4.5-2
+- fix dereference of null pointer
+
 * Thu Nov 25 2021 yanglongkang <yanglongkang@huawei.com> - 4.5-1
 - update to 4.5