From: Anand Jain <Anand.Jain@oracle.com>
Date: Mon, 30 Jun 2014 09:12:48 +0000 (+0800)
Subject: btrfs: fix null pointer dereference in btrfs_show_devname when name is null
X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=0aeb8a6e67cddeac1d42cf64795fde0641a1cffb;p=openwrt%2Fstaging%2Fblogic.git

btrfs: fix null pointer dereference in btrfs_show_devname when name is null

dev->name is null but missing flag is not set.
Strictly speaking the missing flag should have been set, but there
are more places where code just checks if name is null. For now this
patch does the same.

stack:
BUG: unable to handle kernel NULL pointer dereference at 0000000000000064
IP: [<ffffffffa0228908>] btrfs_show_devname+0x58/0xf0 [btrfs]

[<ffffffff81198879>] show_vfsmnt+0x39/0x130
[<ffffffff81178056>] m_show+0x16/0x20
[<ffffffff8117d706>] seq_read+0x296/0x390
[<ffffffff8115aa7d>] vfs_read+0x9d/0x160
[<ffffffff8115b549>] SyS_read+0x49/0x90
[<ffffffff817abe52>] system_call_fastpath+0x16/0x1b

reproducer:
mkfs.btrfs -draid1 -mraid1 /dev/sdg1 /dev/sdg2
btrfstune -S 1 /dev/sdg1
modprobe -r btrfs && modprobe btrfs
mount -o degraded /dev/sdg1 /btrfs
btrfs dev add /dev/sdg3 /btrfs

Signed-off-by: Anand Jain <Anand.Jain@oracle.com>
Signed-off-by: Chris Mason <clm@fb.com>
---

diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c
index 0927e463afca..8e16bca69c56 100644
--- a/fs/btrfs/super.c
+++ b/fs/btrfs/super.c
@@ -1811,6 +1811,8 @@ static int btrfs_show_devname(struct seq_file *m, struct dentry *root)
 		list_for_each_entry(dev, head, dev_list) {
 			if (dev->missing)
 				continue;
+			if (!dev->name)
+				continue;
 			if (!first_dev || dev->devid < first_dev->devid)
 				first_dev = dev;
 		}