linux-kernel - [PATCH 4.2 132/258] nfs: fix v4.2 SEEK on files over 2 gigs

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Date:	Sat, 17 Oct 2015 18:57:25 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, "J. Bruce Fields" <bfields@...hat.com>,
	Anna Schumaker <Anna.Schumaker@...app.com>,
	Trond Myklebust <trond.myklebust@...marydata.com>
Subject: [PATCH 4.2 132/258] nfs: fix v4.2 SEEK on files over 2 gigs

4.2-stable review patch.  If anyone has any objections, please let me know.

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

From: "J. Bruce Fields" <bfields@...hat.com>

commit 306a5549355966e480e0dcacdc6b9321d153e0c0 upstream.

We're incorrectly assigning a loff_t return to an int.  If SEEK_HOLE or
SEEK_DATA returns an offset over 2^31 then the application will see a
weird lseek() result (usually -EIO).

Fixes: bdcc2cd14e4e "NFSv4.2: handle NFS-specific llseek errors"
Signed-off-by: J. Bruce Fields <bfields@...hat.com>
Reviewed-by: Anna Schumaker <Anna.Schumaker@...app.com>
Signed-off-by: Trond Myklebust <trond.myklebust@...marydata.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 fs/nfs/nfs42proc.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

--- a/fs/nfs/nfs42proc.c
+++ b/fs/nfs/nfs42proc.c
@@ -175,10 +175,12 @@ loff_t nfs42_proc_llseek(struct file *fi
 {
 	struct nfs_server *server = NFS_SERVER(file_inode(filep));
 	struct nfs4_exception exception = { };
-	int err;
+	loff_t err;

 	do {
 		err = _nfs42_proc_llseek(filep, offset, whence);
+		if (err >= 0)
+			break;
 		if (err == -ENOTSUPP)
 			return -EOPNOTSUPP;
 		err = nfs4_handle_exception(server, err, &exception);

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