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From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: "Eric W. Biederman" <ebiederm@xmission.com>,
	Trond Myklebust <trond.myklebust@hammerspace.com>,
	Sasha Levin <sashal@kernel.org>,
	linux-nfs@vger.kernel.org
Subject: [PATCH AUTOSEL 4.14 114/371] fs/nfs: Fix nfs_parse_devname to not modify it's argument
Date: Thu, 16 Jan 2020 12:19:46 -0500
Message-ID: <20200116172403.18149-57-sashal@kernel.org> (raw)
In-Reply-To: <20200116172403.18149-1-sashal@kernel.org>

From: "Eric W. Biederman" <ebiederm@xmission.com>

[ Upstream commit 40cc394be1aa18848b8757e03bd8ed23281f572e ]

In the rare and unsupported case of a hostname list nfs_parse_devname
will modify dev_name.  There is no need to modify dev_name as the all
that is being computed is the length of the hostname, so the computed
length can just be shorted.

Fixes: dc04589827f7 ("NFS: Use common device name parsing logic for NFSv4 and NFSv2/v3")
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 fs/nfs/super.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/nfs/super.c b/fs/nfs/super.c
index f464f8d9060c..470b761839a5 100644
--- a/fs/nfs/super.c
+++ b/fs/nfs/super.c
@@ -1925,7 +1925,7 @@ static int nfs_parse_devname(const char *dev_name,
 		/* kill possible hostname list: not supported */
 		comma = strchr(dev_name, ',');
 		if (comma != NULL && comma < end)
-			*comma = 0;
+			len = comma - dev_name;
 	}
 
 	if (len > maxnamlen)
-- 
2.20.1


       reply index

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <20200116172403.18149-1-sashal@kernel.org>
2020-01-16 17:19 ` Sasha Levin [this message]
2020-01-16 17:19 ` [PATCH AUTOSEL 4.14 117/371] NFS: Fix a soft lockup in the delegation recovery code Sasha Levin
2020-01-16 17:19 ` [PATCH AUTOSEL 4.14 121/371] NFS/pnfs: Bulk destroy of layouts needs to be safe w.r.t. umount Sasha Levin
2020-01-16 17:19 ` [PATCH AUTOSEL 4.14 127/371] NFSv4/flexfiles: Fix invalid deref in FF_LAYOUT_DEVID_NODE() Sasha Levin
2020-01-16 17:20 ` [PATCH AUTOSEL 4.14 172/371] NFS: Don't interrupt file writeout due to fatal errors Sasha Levin

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