]> git.proxmox.com Git - mirror_ubuntu-kernels.git/commitdiff
bcache: Strip endline when writing the label through sysfs
authorGabriel de Perthuis <g2p.code@gmail.com>
Tue, 24 Sep 2013 06:17:28 +0000 (23:17 -0700)
committerLinus Torvalds <torvalds@linux-foundation.org>
Tue, 24 Sep 2013 21:41:43 +0000 (14:41 -0700)
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@gmail.com>
Signed-off-by: Kent Overstreet <kmo@daterainc.com>
Cc: linux-stable <stable@vger.kernel.org> # >= v3.10
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
drivers/md/bcache/sysfs.c

index 4fe6ab2fbe2ede59644441521aa4cc2f27f5d312..924dcfdae11102256e1ce193eefc01d82cc173cc 100644 (file)
@@ -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,