linux-kernel - [ 04/57] bcache: Strip endline when writing the label through sysfs

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Message-Id: <20131003040636.907317685@linuxfoundation.org>
Date:	Wed,  2 Oct 2013 21:08:30 -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, Gabriel de Perthuis <g2p.code@...il.com>,
	Kent Overstreet <kmo@...erainc.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: [ 04/57] bcache: Strip endline when writing the label through sysfs

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

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

From: Gabriel de Perthuis <g2p.code@...il.com>

commit aee6f1cfff3ce240eb4b43b41ca466b907acbd2e upstream.

sysfs attributes with unusual characters have crappy failure modes
in Squeeze (udev 164); later versions of udev are unaffected.

This should make these characters more unusual.

Signed-off-by: Gabriel de Perthuis <g2p.code@...il.com>
Signed-off-by: Kent Overstreet <kmo@...erainc.com>
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/md/bcache/sysfs.c |    9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

--- a/drivers/md/bcache/sysfs.c
+++ b/drivers/md/bcache/sysfs.c
@@ -223,8 +223,13 @@ STORE(__cached_dev)
 	}
 
 	if (attr == &sysfs_label) {
-		/* note: endlines are preserved */
-		memcpy(dc->sb.label, buf, SB_LABEL_SIZE);
+		if (size > SB_LABEL_SIZE)
+			return -EINVAL;
+		memcpy(dc->sb.label, buf, size);
+		if (size < SB_LABEL_SIZE)
+			dc->sb.label[size] = '\0';
+		if (size && dc->sb.label[size - 1] == '\n')
+			dc->sb.label[size - 1] = '\0';
 		bch_write_bdev_super(dc, NULL);
 		if (dc->disk.c) {
 			memcpy(dc->disk.c->uuids[dc->disk.id].label,


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