SUNRPC: Don't leak netobj memory when gss_read_proxy_verf() fails

stable inclusion
from stable-v4.19.270
commit 76f2497a2faa6a4e91efb94a7f55705b403273fd
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I6DPF8
CVE: NA

--------------------------------

commit da522b5f upstream.

Fixes: 030d794b ("SUNRPC: Use gssproxy upcall for server RPCGSS authentication.")
Signed-off-by: NChuck Lever <chuck.lever@oracle.com>
Cc: <stable@vger.kernel.org>
Reviewed-by: NJeff Layton <jlayton@kernel.org>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

Conflicts:
	net/sunrpc/auth_gss/svcauth_gss.c
Signed-off-by: NBaisong Zhong <zhongbaisong@huawei.com>
Reviewed-by: NLiu Jian <liujian56@huawei.com>
Signed-off-by: NYongqiang Liu <liuyongqiang13@huawei.com>

net/sunrpc/auth_gss/svcauth_gss.c

@@ -1092,8 +1092,10 @@ gss_read_proxy_verf(struct svc_rqst *rqstp,
 		return res;
 
 	inlen = svc_getnl(argv);
-	if (inlen > (argv->iov_len + rqstp->rq_arg.page_len))
+	if (inlen > (argv->iov_len + rqstp->rq_arg.page_len)) {
+		kfree(in_handle->data);
 		return SVC_DENIED;
+	}
 
 	in_token->pages = rqstp->rq_pages;
 	in_token->page_base = (ulong)argv->iov_base & ~PAGE_MASK;