btrfs: ensure we don't overrun devices_info[] in __btrfs_alloc_chunk

WARN_ON isn't enough, we need to stop the loop if for any reason
we would overrun the devices_info array.

I tried to track down the connection between the length of
the alloc_devices list and the rw_devices counter but
it wasn't immediately obvious, so be defensive about it.

Signed-off-by: Eric Sandeen <sandeen@redhat.com>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>

1 files changed, 5 insertions, 1 deletions

diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index c7843349c795..305b6a63ab1f 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -3734,12 +3734,16 @@ static int __btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
                 if (max_avail < BTRFS_STRIPE_LEN * dev_stripes)
                         continue;
 
+                if (ndevs == fs_devices->rw_devices) {
+                        WARN(1, "%s: found more than %llu devices\n",
+                             __func__, fs_devices->rw_devices);
+                        break;
+                }
                 devices_info[ndevs].dev_offset = dev_offset;
                 devices_info[ndevs].max_avail = max_avail;
                 devices_info[ndevs].total_avail = total_avail;
                 devices_info[ndevs].dev = device;
                 ++ndevs;
-                WARN_ON(ndevs > fs_devices->rw_devices);
         }
 
         /*