dev_name() determine whether the dev->aliases linked list is

empty before obtaining the dev name

If dev->aliases linked list is empty, then directly obtain the str
address of dm_str_list saved in dev_aliases.n, an unknown address
will be returned, which may cause segfault.

So we need to judge whether the dev->aliases linked list is empty before
getting it to avoid returning unknown address.

Fix issue: https://gitee.com/src-openeuler/lvm2/issues/I4RZP9

Signed-off-by: Zhiqiang Liu <liuzhiqiang26@huawei.com>

0013-dev_name-determine-whether-the-dev-aliases-linked-li.patch

@@ -0,0 +1,36 @@
+From 472dd53a091e0e4b0d2db8fcd10da3f408873633 Mon Sep 17 00:00:00 2001
+From: Zhiqiang Liu <liuzhiqiang26@huawei.com>
+Date: Sun, 30 Jan 2022 11:37:51 +0800
+Subject: [PATCH] dev_name() determine whether the dev->aliases linked list is
+ empty before obtaining the dev name
+
+If dev->aliases linked list is empty, then directly obtain the str
+address of dm_str_list saved in dev_aliases.n, an unknown address
+will be returned, which may cause segfault.
+
+So we need to judge whether the dev->aliases linked list is empty before
+getting it to avoid returning unknown address.
+
+Signed-off-by: Zhiqiang Liu <liuzhiqiang26@huawei.com>
+---
+ lib/device/dev-cache.c | 4 ++--
+ 1 file changed, 2 insertions(+), 2 deletions(-)
+
+diff --git a/lib/device/dev-cache.c b/lib/device/dev-cache.c
+index 33b75a9..1263820 100644
+--- a/lib/device/dev-cache.c
++++ b/lib/device/dev-cache.c
+@@ -1703,8 +1703,8 @@ int dev_fd(struct device *dev)
+ 
+ const char *dev_name(const struct device *dev)
+ {
+-	return (dev && dev->aliases.n) ? dm_list_item(dev->aliases.n, struct dm_str_list)->str :
+-	    unknown_device_name();
++	return (dev && dev->aliases.n && !dm_list_empty(&dev->aliases)) ?\
++		dm_list_item(dev->aliases.n, struct dm_str_list)->str : unknown_device_name();
+ }
+ 
+ bool dev_cache_has_md_with_end_superblock(struct dev_types *dt)
+-- 
+1.8.3.1
+

lvm2.spec

@@ -43,7 +43,7 @@
 
 Name:      lvm2
 Version:   2.03.14
-Release:   2
+Release:   3
 Epoch:     8
 Summary:   Tools for logical volume management
 License:   GPLv2+ and LGPLv2.1 and BSD
@@ -61,6 +61,7 @@ Patch9:    0009-enhancement-syslog-more-when-use-libdevmapper-so.patch
 Patch10:   0010-enhancement-log-it-when-disk-slow.patch
 Patch11:   0011-bugfix-lvm2-fix-the-reuse-of-va_list.patch
 Patch12:   0012-13-dm-disk.rules-check-DM_NAME-before-create-symlink.patch
+Patch13:   0013-dev_name-determine-whether-the-dev-aliases-linked-li.patch
 
 BuildRequires: gcc
 BuildRequires: gcc-c++
@@ -487,6 +488,10 @@ fi
 
 
 %changelog
+* Sun Jan 30 2022 Zhiqiang Liu <liuzhiqiang26@huawei.com> - 8.2.03.14-3
+- dev_name() determine whether the dev->aliases linked list is
+ empty before obtaining the dev name
+
 * Sun Jan 30 2022 Zhiqiang Liu <liuzhiqiang26@huawei.com> - 8.2.03.14-2
 - check DM_NAME before creating symlink in 13-dm-disk.rules