linux-kernel - [PATCH] scsi: lpfc: Fix gcc -Wstringop-overread warning, again

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Message-Id: <20210920095628.1191676-1-arnd@kernel.org>
Date:   Mon, 20 Sep 2021 11:56:22 +0200
From:   Arnd Bergmann <arnd@...nel.org>
To:     James Smart <james.smart@...adcom.com>,
        Dick Kennedy <dick.kennedy@...adcom.com>,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Arnd Bergmann <arnd@...db.de>,
        Justin Tee <justin.tee@...adcom.com>
Cc:     Lee Jones <lee.jones@...aro.org>,
        Gaurav Srivastava <gaurav.srivastava@...adcom.com>,
        linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] scsi: lpfc: Fix gcc -Wstringop-overread warning, again

From: Arnd Bergmann <arnd@...db.de>

I fixed a stringop-overread warning earlier this year, now a
second copy of the original code was added and the warning came
back:

drivers/scsi/lpfc/lpfc_attr.c: In function 'lpfc_cmf_info_show':
drivers/scsi/lpfc/lpfc_attr.c:289:25: error: 'strnlen' specified bound 4095 exceeds source size 24 [-Werror=stringop-overread]
  289 |                         strnlen(LPFC_INFO_MORE_STR, PAGE_SIZE - 1),
      |                         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Fix it the same way as the other copy.

Fixes: ada48ba70f6b ("scsi: lpfc: Fix gcc -Wstringop-overread warning")
Fixes: 74a7baa2a3ee ("scsi: lpfc: Add cmf_info sysfs entry")
Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 drivers/scsi/lpfc/lpfc_attr.c | 7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

diff --git a/drivers/scsi/lpfc/lpfc_attr.c b/drivers/scsi/lpfc/lpfc_attr.c
index b35bf70a8c0d..ca0433e28ac3 100644
--- a/drivers/scsi/lpfc/lpfc_attr.c
+++ b/drivers/scsi/lpfc/lpfc_attr.c
@@ -285,11 +285,8 @@ lpfc_cmf_info_show(struct device *dev, struct device_attribute *attr,
 				"6312 Catching potential buffer "
 				"overflow > PAGE_SIZE = %lu bytes\n",
 				PAGE_SIZE);
-		strscpy(buf + PAGE_SIZE - 1 -
-			strnlen(LPFC_INFO_MORE_STR, PAGE_SIZE - 1),
-			LPFC_INFO_MORE_STR,
-			strnlen(LPFC_INFO_MORE_STR, PAGE_SIZE - 1)
-			+ 1);
+		strscpy(buf + PAGE_SIZE - 1 - sizeof(LPFC_INFO_MORE_STR),
+			LPFC_INFO_MORE_STR, sizeof(LPFC_INFO_MORE_STR) + 1);
 	}
 	return len;
 }
-- 
2.29.2