linux-kernel - [PATCH] nfsd: Fix a memory leak in an error handling path

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Message-Id: <122a5729fdcd76e23641c7d1853de2a632f6a742.1661509473.git.christophe.jaillet@wanadoo.fr>
Date:   Fri, 26 Aug 2022 12:24:54 +0200
From:   Christophe JAILLET <christophe.jaillet@...adoo.fr>
To:     Chuck Lever <chuck.lever@...cle.com>,
        Jeff Layton <jlayton@...nel.org>,
        "J. Bruce Fields" <bfields@...hat.com>,
        Scott Mayhew <smayhew@...hat.com>
Cc:     linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>,
        linux-nfs@...r.kernel.org
Subject: [PATCH] nfsd: Fix a memory leak in an error handling path

If this memdup_user() call fails, the memory allocated in a previous call
a few lines above should be freed. Otherwise it leaks.

Fixes: 6ee95d1c8991 ("nfsd: add support for upcall version 2")
Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
---
Speculative, untested.
---
 fs/nfsd/nfs4recover.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/fs/nfsd/nfs4recover.c b/fs/nfsd/nfs4recover.c
index b29d27eaa8a6..248ff9f4141c 100644
--- a/fs/nfsd/nfs4recover.c
+++ b/fs/nfsd/nfs4recover.c
@@ -815,8 +815,10 @@ __cld_pipe_inprogress_downcall(const struct cld_msg_v2 __user *cmsg,
 				princhash.data = memdup_user(
 						&ci->cc_princhash.cp_data,
 						princhashlen);
-				if (IS_ERR_OR_NULL(princhash.data))
+				if (IS_ERR_OR_NULL(princhash.data)) {
+					kfree(name.data);
 					return -EFAULT;
+				}
 				princhash.len = princhashlen;
 			} else
 				princhash.len = 0;
-- 
2.34.1