nvme-multipath: zero out ANA log buffer

[ Upstream commit c7055fd15ff46d92eb0dd1c16a4fe010d58224c8 ]

When nvme_init_identify() fails the ANA log buffer is deallocated
but _not_ set to NULL. This can cause double free oops when this
controller is deleted without ever being reconnected.

Signed-off-by: Hannes Reinecke <hare@suse.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/nvme/host/multipath.c b/drivers/nvme/host/multipath.c
index c27af277e14eed224b66aef7cb5ee48adf63b499..815509dbed8460f917f5c2aeb9fc8faa915cdf53 100644 (file)
--- a/drivers/nvme/host/multipath.c
+++ b/drivers/nvme/host/multipath.c
@@ -556,6 +556,7 @@ int nvme_mpath_init(struct nvme_ctrl *ctrl, struct nvme_id_ctrl *id)
        return 0;
 out_free_ana_log_buf:
        kfree(ctrl->ana_log_buf);
+       ctrl->ana_log_buf = NULL;
 out:
        return error;
 }
@@ -563,5 +564,6 @@ out:
 void nvme_mpath_uninit(struct nvme_ctrl *ctrl)
 {
        kfree(ctrl->ana_log_buf);
+       ctrl->ana_log_buf = NULL;
 }