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Subject[PATCH 4.19 36/85] nvme-multipath: zero out ANA log buffer
Date
4.19-stable review patch.  If anyone has any objections, please let me know.

------------------

[ 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>
---
drivers/nvme/host/multipath.c | 2 ++
1 file changed, 2 insertions(+)

diff --git a/drivers/nvme/host/multipath.c b/drivers/nvme/host/multipath.c
index c27af277e14e..815509dbed84 100644
--- 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 @@ int nvme_mpath_init(struct nvme_ctrl *ctrl, struct nvme_id_ctrl *id)
void nvme_mpath_uninit(struct nvme_ctrl *ctrl)
{
kfree(ctrl->ana_log_buf);
+ ctrl->ana_log_buf = NULL;
}

--
2.19.1


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