linux-kernel - [PATCH] scsi: csiostor: Uninitialized data in csio_ln_vnp_read

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Date:   Wed, 6 Oct 2021 10:32:43 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        Naresh Kumar Inna <naresh@...lsio.com>
Cc:     "Martin K. Petersen" <martin.petersen@...cle.com>,
        James Bottomley <JBottomley@...allels.com>,
        linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
        kernel-janitors@...r.kernel.org
Subject: [PATCH] scsi: csiostor: Uninitialized data in csio_ln_vnp_read_cbfn()

This variable is just a temporary variable, used to do an endian
conversion.  The problem is that the last byte is not initialized.
After the conversion is completely done, the last byte is discarded so
it doesn't cause a problem.  But static checkers and the KMSan runtime
checker can detect the uninitialized read and will complain about it.

Fixes: 5036f0a0ecd3 ("[SCSI] csiostor: Fix sparse warnings.")
Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
---
 drivers/scsi/csiostor/csio_lnode.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/scsi/csiostor/csio_lnode.c b/drivers/scsi/csiostor/csio_lnode.c
index dc98f51f466f..d5ac93897023 100644
--- a/drivers/scsi/csiostor/csio_lnode.c
+++ b/drivers/scsi/csiostor/csio_lnode.c
@@ -619,7 +619,7 @@ csio_ln_vnp_read_cbfn(struct csio_hw *hw, struct csio_mb *mbp)
 	struct fc_els_csp *csp;
 	struct fc_els_cssp *clsp;
 	enum fw_retval retval;
-	__be32 nport_id;
+	__be32 nport_id = 0;
 
 	retval = FW_CMD_RETVAL_G(ntohl(rsp->alloc_to_len16));
 	if (retval != FW_SUCCESS) {
-- 
2.20.1