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ksmbd: fix posix_acls and acls dereferencing possible ERR_PTR()

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[ Upstream commit 25933573ef48f3586f559c2cac6c436c62dcf63f ]

Dan reported the following error message:

fs/smb/server/smbacl.c:1296 smb_check_perm_dacl()
    error: 'posix_acls' dereferencing possible ERR_PTR()
fs/smb/server/vfs.c:1323 ksmbd_vfs_make_xattr_posix_acl()
    error: 'posix_acls' dereferencing possible ERR_PTR()
fs/smb/server/vfs.c:1830 ksmbd_vfs_inherit_posix_acl()
    error: 'acls' dereferencing possible ERR_PTR()

__get_acl() returns a mix of error pointers and NULL. This change it
with IS_ERR_OR_NULL().

Fixes: e2f34481b2 ("cifsd: add server-side procedures for SMB3")
Cc: stable@vger.kernel.org
Reported-by: Dan Carpenter <dan.carpenter@linaro.org>
Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>
Signed-off-by: Steve French <stfrench@microsoft.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Namjae Jeon 2023-12-31 16:12:41 +09:00 committed by Greg Kroah-Hartman
parent 1524884c3e
commit 13a5045011
2 changed files with 4 additions and 4 deletions
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4
fs/smb/server/smbacl.c
View File

@ -1313,7 +1313,7 @@ int smb_check_perm_dacl(struct ksmbd_conn *conn, const struct path *path,
if (IS_ENABLED(CONFIG_FS_POSIX_ACL)) {
posix_acls = get_acl(d_inode(path->dentry), ACL_TYPE_ACCESS);
if (posix_acls && !found) {
if (!IS_ERR_OR_NULL(posix_acls) && !found) {
unsigned int id = -1;
pa_entry = posix_acls->a_entries;
@ -1337,7 +1337,7 @@ int smb_check_perm_dacl(struct ksmbd_conn *conn, const struct path *path,
}
}
}
if (posix_acls)
if (!IS_ERR_OR_NULL(posix_acls))
posix_acl_release(posix_acls);
}

4
fs/smb/server/vfs.c
View File

@ -1322,7 +1322,7 @@ static struct xattr_smb_acl *ksmbd_vfs_make_xattr_posix_acl(struct user_namespac
return NULL;
posix_acls = get_acl(inode, acl_type);
if (!posix_acls)
if (IS_ERR_OR_NULL(posix_acls))
return NULL;
smb_acl = kzalloc(sizeof(struct xattr_smb_acl) +
@ -1830,7 +1830,7 @@ int ksmbd_vfs_inherit_posix_acl(struct user_namespace *user_ns,
return -EOPNOTSUPP;
acls = get_acl(parent_inode, ACL_TYPE_DEFAULT);
if (!acls)
if (IS_ERR_OR_NULL(acls))
return -ENOENT;
pace = acls->a_entries;