linux-kernel - [154/205] splice: check f

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Date:	Fri, 30 Jul 2010 10:52:51 -0700
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Changli Gao <xiaosuo@...il.com>,
	Miklos Szeredi <mszeredi@...e.cz>,
	Jens Axboe <jaxboe@...ionio.com>
Subject: [154/205] splice: check f_mode for seekable file

2.6.34-stable review patch.  If anyone has any objections, please let us know.

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

From: Changli Gao <xiaosuo@...il.com>

commit 19c9a49b432f245c6293508d164a4350f1f2c601 upstream.

check f_mode for seekable file

As a seekable file is allowed without a llseek function, so the old way isn't
work any more.

Signed-off-by: Changli Gao <xiaosuo@...il.com>
Signed-off-by: Miklos Szeredi <mszeredi@...e.cz>
Signed-off-by: Jens Axboe <jaxboe@...ionio.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 fs/splice.c |    6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

--- a/fs/splice.c
+++ b/fs/splice.c
@@ -1322,8 +1322,7 @@ static long do_splice(struct file *in, l
 		if (off_in)
 			return -ESPIPE;
 		if (off_out) {
-			if (!out->f_op || !out->f_op->llseek ||
-			    out->f_op->llseek == no_llseek)
+			if (!(out->f_mode & FMODE_PWRITE))
 				return -EINVAL;
 			if (copy_from_user(&offset, off_out, sizeof(loff_t)))
 				return -EFAULT;
@@ -1343,8 +1342,7 @@ static long do_splice(struct file *in, l
 		if (off_out)
 			return -ESPIPE;
 		if (off_in) {
-			if (!in->f_op || !in->f_op->llseek ||
-			    in->f_op->llseek == no_llseek)
+			if (!(in->f_mode & FMODE_PREAD))
 				return -EINVAL;
 			if (copy_from_user(&offset, off_in, sizeof(loff_t)))
 				return -EFAULT;


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