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authorAnand Jain <Anand.Jain@oracle.com>2014-06-30 17:12:48 +0800
committerChris Mason <clm@fb.com>2014-07-03 07:04:09 -0700
commit0aeb8a6e67cddeac1d42cf64795fde0641a1cffb (patch)
tree8e2df35a2b6385beee920f4c0063ad97c2332311 /fs
parente755f780865221252ef3321215c9796b78e7b1c5 (diff)
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>
Diffstat (limited to 'fs')
-rw-r--r--fs/btrfs/super.c2
1 files changed, 2 insertions, 0 deletions
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;
}