linux-kernel - [PATCH v2 3/3] nfsd: Propagate some error code returned by memdup

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Message-Id: <d8af52e13f53dcb14d72486d6ac92607d5f42716.1662009844.git.christophe.jaillet@wanadoo.fr>
Date:   Thu,  1 Sep 2022 07:27:19 +0200
From:   Christophe JAILLET <christophe.jaillet@...adoo.fr>
To:     Chuck Lever <chuck.lever@...cle.com>,
        Jeff Layton <jlayton@...nel.org>
Cc:     linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>,
        Dan Carpenter <dan.carpenter@...cle.com>,
        linux-nfs@...r.kernel.org
Subject: [PATCH v2 3/3] nfsd: Propagate some error code returned by memdup_user()

Propagate the error code returned by memdup_user() instead of a hard coded
-EFAULT.

Suggested-by: Dan Carpenter <dan.carpenter@...cle.com>
Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
---
This patch is speculative. The whole call chains have not been checked to
see if there was no path explicitly expecting a -EFAULT.
---
 fs/nfsd/nfs4recover.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/fs/nfsd/nfs4recover.c b/fs/nfsd/nfs4recover.c
index 2968cf604e3b..78b8cd9651d5 100644
--- a/fs/nfsd/nfs4recover.c
+++ b/fs/nfsd/nfs4recover.c
@@ -808,7 +808,7 @@ __cld_pipe_inprogress_downcall(const struct cld_msg_v2 __user *cmsg,
 				return -EFAULT;
 			name.data = memdup_user(&ci->cc_name.cn_id, namelen);
 			if (IS_ERR(name.data))
-				return -EFAULT;
+				return PTR_ERR(name.data);
 			name.len = namelen;
 			get_user(princhashlen, &ci->cc_princhash.cp_len);
 			if (princhashlen > 0) {
@@ -817,7 +817,7 @@ __cld_pipe_inprogress_downcall(const struct cld_msg_v2 __user *cmsg,
 						princhashlen);
 				if (IS_ERR(princhash.data)) {
 					kfree(name.data);
-					return -EFAULT;
+					return PTR_ERR(princhash.data);
 				}
 				princhash.len = princhashlen;
 			} else
@@ -830,7 +830,7 @@ __cld_pipe_inprogress_downcall(const struct cld_msg_v2 __user *cmsg,
 				return -EFAULT;
 			name.data = memdup_user(&cnm->cn_id, namelen);
 			if (IS_ERR(name.data))
-				return -EFAULT;
+				return PTR_ERR(name.data);
 			name.len = namelen;
 		}
 		if (name.len > 5 && memcmp(name.data, "hash:", 5) == 0) {
-- 
2.34.1