Memory Leak Affecting kernel-default package, versions <5.14.21-150400.24.128.1
Threat Intelligence
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Test your applications- Snyk IDSNYK-SLES154-KERNELDEFAULT-7689458
- published16 Aug 2024
- disclosed15 Aug 2024
Introduced: 15 Aug 2024
CVE-2021-47585 (opens in a new tab)How to fix?
Upgrade SLES:15.4 kernel-default to version 5.14.21-150400.24.128.1 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream kernel-default package and not the kernel-default package as distributed by SLES.
See How to fix? for SLES:15.4 relevant fixed versions and status.
In the Linux kernel, the following vulnerability has been resolved:
btrfs: fix memory leak in __add_inode_ref()
Line 1169 (#3) allocates a memory chunk for victim_name by kmalloc(), but when the function returns in line 1184 (#4) victim_name allocated by line 1169 (#3) is not freed, which will lead to a memory leak. There is a similar snippet of code in this function as allocating a memory chunk for victim_name in line 1104 (#1) as well as releasing the memory in line 1116 (#2).
We should kfree() victim_name when the return value of backref_in_log() is less than zero and before the function returns in line 1184 (#4).
1057 static inline int __add_inode_ref(struct btrfs_trans_handle *trans, 1058 struct btrfs_root *root, 1059 struct btrfs_path *path, 1060 struct btrfs_root *log_root, 1061 struct btrfs_inode *dir, 1062 struct btrfs_inode *inode, 1063 u64 inode_objectid, u64 parent_objectid, 1064 u64 ref_index, char *name, int namelen, 1065 int *search_done) 1066 {
1104 victim_name = kmalloc(victim_name_len, GFP_NOFS); // #1: kmalloc (victim_name-1) 1105 if (!victim_name) 1106 return -ENOMEM;
1112 ret = backref_in_log(log_root, &search_key, 1113 parent_objectid, victim_name, 1114 victim_name_len); 1115 if (ret < 0) { 1116 kfree(victim_name); // #2: kfree (victim_name-1) 1117 return ret; 1118 } else if (!ret) {
1169 victim_name = kmalloc(victim_name_len, GFP_NOFS); // #3: kmalloc (victim_name-2) 1170 if (!victim_name) 1171 return -ENOMEM;
1180 ret = backref_in_log(log_root, &search_key, 1181 parent_objectid, victim_name, 1182 victim_name_len); 1183 if (ret < 0) { 1184 return ret; // #4: missing kfree (victim_name-2) 1185 } else if (!ret) {
1241 return 0; 1242 }
References
- https://www.suse.com/security/cve/CVE-2021-47585.html
- https://bugzilla.suse.com/1226556
- https://git.kernel.org/stable/c/005d9292b5b2e71a009f911bd85d755009b37242
- https://git.kernel.org/stable/c/493ff661d434d6bdf02e3a21adae04d7a0b4265d
- https://git.kernel.org/stable/c/f35838a6930296fc1988764cfa54cb3f705c0665