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nvme: Fix nvme_get/set_features() with a NULL result pointer 

nvme_set_features() callers seem to expect that passing NULL as the
result pointer is acceptable.  Teach nvme_set_features() not to try to
write to the NULL address.

For symmetry, make the same change to nvme_get_features(), despite the
fact that all current callers pass a valid result pointer.

I assume that this bug hasn't been reported in practice because
the callers that pass NULL are all in the SCSI translation layer
and no one uses the relevant operations.

Cc: stable@vger.kernel.org
Signed-off-by: Andy Lutomirski <luto@kernel.org>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Signed-off-by: Jens Axboe <axboe@fb.com>
hifive-unleashed-5.1
Andy Lutomirski 2016-08-24 03:52:12 -07:00 committed by Jens Axboe
parent e9e5e3fae8
commit 9b47f77a68
1 changed files with 2 additions and 2 deletions
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4
drivers/nvme/host/core.c
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@ -611,7 +611,7 @@ int nvme_get_features(struct nvme_ctrl *dev, unsigned fid, unsigned nsid,
ret = __nvme_submit_sync_cmd(dev->admin_q, &c, &cqe, NULL, 0, 0,
NVME_QID_ANY, 0, 0);
if (ret >= 0)
if (ret >= 0 && result)
*result = le32_to_cpu(cqe.result);
return ret;
}
@ -631,7 +631,7 @@ int nvme_set_features(struct nvme_ctrl *dev, unsigned fid, unsigned dword11,
ret = __nvme_submit_sync_cmd(dev->admin_q, &c, &cqe, NULL, 0, 0,
NVME_QID_ANY, 0, 0);
if (ret >= 0)
if (ret >= 0 && result)
*result = le32_to_cpu(cqe.result);
return ret;
}