From acb1b6caf179d405ebd1dddefe916ccbb9b90298 Mon Sep 17 00:00:00 2001 From: Alex Elder Date: Thu, 25 Apr 2013 15:09:41 -0500 Subject: [PATCH] rbd: only update values on snap_info success Change rbd_dev_v2_snap_info() so it only ever sets values of the size and features parameters if looking up the snapshot name was successful. Signed-off-by: Alex Elder Reviewed-by: Josh Durgin --- drivers/block/rbd.c | 24 +++++++++++++++++++----- 1 file changed, 19 insertions(+), 5 deletions(-) diff --git a/drivers/block/rbd.c b/drivers/block/rbd.c index 1e01f0d8312a..e7d10d384f07 100644 --- a/drivers/block/rbd.c +++ b/drivers/block/rbd.c @@ -3908,6 +3908,7 @@ static char *rbd_dev_v2_snap_name(struct rbd_device *rbd_dev, u32 which) if (!reply_buf) return ERR_PTR(-ENOMEM); + rbd_assert(which < rbd_dev->header.snapc->num_snaps); snap_id = cpu_to_le64(rbd_dev->header.snapc->snaps[which]); ret = rbd_obj_method_sync(rbd_dev, rbd_dev->header_name, "rbd", "get_snapshot_name", @@ -3940,17 +3941,30 @@ static char *rbd_dev_v2_snap_info(struct rbd_device *rbd_dev, u32 which, u64 *snap_size, u64 *snap_features) { u64 snap_id; + u64 size; + u64 features; + char *snap_name; int ret; + rbd_assert(which < rbd_dev->header.snapc->num_snaps); snap_id = rbd_dev->header.snapc->snaps[which]; - ret = _rbd_dev_v2_snap_size(rbd_dev, snap_id, NULL, snap_size); + ret = _rbd_dev_v2_snap_size(rbd_dev, snap_id, NULL, &size); if (ret) - return ERR_PTR(ret); - ret = _rbd_dev_v2_snap_features(rbd_dev, snap_id, snap_features); + goto out_err; + + ret = _rbd_dev_v2_snap_features(rbd_dev, snap_id, &features); if (ret) - return ERR_PTR(ret); + goto out_err; + + snap_name = rbd_dev_v2_snap_name(rbd_dev, which); + if (!IS_ERR(snap_name)) { + *snap_size = size; + *snap_features = features; + } - return rbd_dev_v2_snap_name(rbd_dev, which); + return snap_name; +out_err: + return ERR_PTR(ret); } static char *rbd_dev_snap_info(struct rbd_device *rbd_dev, u32 which, -- 2.20.1