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| author | Eric Sandeen <sandeen@redhat.com> | 2013-01-31 00:55:01 +0000 |
|---|---|---|
| committer | Josef Bacik <jbacik@fusionio.com> | 2013-02-20 12:59:26 -0500 |
| commit | 063d006fa06fbf73fab370921120380333a33e85 (patch) | |
| tree | 5a6650052c7409fc8895762fcc7ef8015e5088b8 /fs/btrfs | |
| parent | 1971e917c8c99ff190264305803fbafcbbac1422 (diff) | |
| download | linux-063d006fa06fbf73fab370921120380333a33e85.tar.gz linux-063d006fa06fbf73fab370921120380333a33e85.tar.bz2 linux-063d006fa06fbf73fab370921120380333a33e85.zip | |
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>
Diffstat (limited to 'fs/btrfs')
| -rw-r--r-- | fs/btrfs/volumes.c | 6 |
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); } /* |