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| author | Josh Durgin <josh.durgin@dreamhost.com> | 2011-11-15 14:49:53 -0800 |
|---|---|---|
| committer | Sage Weil <sage@newdream.net> | 2011-12-07 10:46:10 -0800 |
| commit | 81e759fbf7715514c32e563789db1d9d47fd55fb (patch) | |
| tree | 076296ce4a9c12c400e0a0de39d80844ced3aa14 | |
| parent | 2151937d7ce491bfbe269a1ae742c6686904474c (diff) | |
| download | op-kernel-dev-81e759fbf7715514c32e563789db1d9d47fd55fb.zip op-kernel-dev-81e759fbf7715514c32e563789db1d9d47fd55fb.tar.gz | |
rbd: return an error when an invalid header is read
This protects against opening future rbd images that have incompatible format changes.
Signed-off-by: Josh Durgin <josh.durgin@dreamhost.com>
| -rw-r--r-- | drivers/block/rbd.c | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/drivers/block/rbd.c b/drivers/block/rbd.c index 65cc424..a828c6a 100644 --- a/drivers/block/rbd.c +++ b/drivers/block/rbd.c @@ -461,6 +461,10 @@ static int rbd_header_from_disk(struct rbd_image_header *header, u32 snap_count = le32_to_cpu(ondisk->snap_count); int ret = -ENOMEM; + if (memcmp(ondisk, RBD_HEADER_TEXT, sizeof(RBD_HEADER_TEXT))) { + return -ENXIO; + } + init_rwsem(&header->snap_rwsem); header->snap_names_len = le64_to_cpu(ondisk->snap_names_len); header->snapc = kmalloc(sizeof(struct ceph_snap_context) + @@ -1610,8 +1614,13 @@ static int rbd_read_header(struct rbd_device *rbd_dev, goto out_dh; rc = rbd_header_from_disk(header, dh, snap_count, GFP_KERNEL); - if (rc < 0) + if (rc < 0) { + if (rc == -ENXIO) { + pr_warning("unrecognized header format" + " for image %s", rbd_dev->obj); + } goto out_dh; + } if (snap_count != header->total_snaps) { snap_count = header->total_snaps; |
