linux-kernel - [PATCH 4.9 119/171] nvmet: fix space padding in serial number

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Message-Id: <20181108215135.902989711@linuxfoundation.org>
Date:   Thu,  8 Nov 2018 13:51:29 -0800
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Daniel Verkamp <daniel.verkamp@...el.com>,
        Martin Wilck <mwilck@...e.com>,
        Keith Busch <keith.busch@...el.com>,
        Jens Axboe <axboe@...nel.dk>, Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.9 119/171] nvmet: fix space padding in serial number

4.9-stable review patch.  If anyone has any objections, please let me know.

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

[ Upstream commit c73996984902516745bc587d5e8a0b2e034aea05 ]

Commit 42de82a8b544 previously attempted to fix this, and it did
correctly pad the MN and FR fields with spaces, but the SN field still
contains 0 bytes.  The current code fills out the first 16 bytes with
hex2bin, leaving the last 4 bytes zeroed.  Rather than adding a lot of
error-prone math to avoid overwriting SN twice, just set the whole thing
to spaces up front (it's only 20 bytes).

Fixes: 42de82a8b544 ("nvmet: don't report 0-bytes in serial number")
Signed-off-by: Daniel Verkamp <daniel.verkamp@...el.com>
Reviewed-by: Martin Wilck <mwilck@...e.com>
Signed-off-by: Keith Busch <keith.busch@...el.com>
Signed-off-by: Jens Axboe <axboe@...nel.dk>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/nvme/target/admin-cmd.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/nvme/target/admin-cmd.c b/drivers/nvme/target/admin-cmd.c
index 2caed285fd7b..cdb7752dcbb7 100644
--- a/drivers/nvme/target/admin-cmd.c
+++ b/drivers/nvme/target/admin-cmd.c
@@ -192,6 +192,7 @@ static void nvmet_execute_identify_ctrl(struct nvmet_req *req)
 	id->vid = 0;
 	id->ssvid = 0;
 
+	memset(id->sn, ' ', sizeof(id->sn));
 	bin2hex(id->sn, &ctrl->subsys->serial,
 		min(sizeof(ctrl->subsys->serial), sizeof(id->sn) / 2));
 	copy_and_pad(id->mn, sizeof(id->mn), model, sizeof(model) - 1);
-- 
2.17.1