Merge: smb: client: Handle kstrdup failures for passwords

MR: https://gitlab.com/redhat/centos-stream/src/kernel/centos-stream-9/-/merge_requests/5695

JIRA: https://issues.redhat.com/browse/RHEL-65939

CVE: CVE-2024-50120

Signed-off-by: Paulo Alcantara <paalcant@redhat.com>

Approved-by: Chris von Recklinghausen <crecklin@redhat.com>
Approved-by: Benjamin Coddington <bcodding@redhat.com>
Approved-by: CKI KWF Bot <cki-ci-bot+kwf-gitlab-com@redhat.com>

Merged-by: Rado Vrbovsky <rvrbovsk@redhat.com>

Author: emmil

fs/smb/client/fs_context.c

@@ -918,8 +918,15 @@ static int smb3_reconfigure(struct fs_context *fc)
 	else  {
 		kfree_sensitive(ses->password);
 		ses->password = kstrdup(ctx->password, GFP_KERNEL);
+		if (!ses->password)
+			return -ENOMEM;
 		kfree_sensitive(ses->password2);
 		ses->password2 = kstrdup(ctx->password2, GFP_KERNEL);
+		if (!ses->password2) {
+			kfree_sensitive(ses->password);
+			ses->password = NULL;
+			return -ENOMEM;
+		}
 	}
 	STEAL_STRING(cifs_sb, ctx, domainname);
 	STEAL_STRING(cifs_sb, ctx, nodename);