linux-kernel - [PATCH 02/22] scsi: megaraid: fix format-overflow warning

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Date:   Fri, 14 Jul 2017 14:06:54 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     linux-kernel@...r.kernel.org,
        Kashyap Desai <kashyap.desai@...adcom.com>,
        Sumit Saxena <sumit.saxena@...adcom.com>,
        Shivasharan S <shivasharan.srikanteshwara@...adcom.com>,
        "James E.J. Bottomley" <jejb@...ux.vnet.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Guenter Roeck <linux@...ck-us.net>, akpm@...ux-foundation.org,
        netdev@...r.kernel.org, "David S . Miller" <davem@...emloft.net>,
        linux-scsi@...r.kernel.org, x86@...nel.org,
        Arnd Bergmann <arnd@...db.de>, megaraidlinux.pdl@...adcom.com
Subject: [PATCH 02/22] scsi: megaraid: fix format-overflow warning

gcc-7 complains that the firmware version strings might overflow
for some values:

drivers/scsi/megaraid.c: In function 'megaraid_probe_one':
drivers/scsi/megaraid.c:314:33: error: '%d' directive writing between 1 and 2 bytes into a region of size between 1 and 2 [-Werror=format-overflow=]
drivers/scsi/megaraid.c:314:33: note: directive argument in the range [0, 15]
drivers/scsi/megaraid.c:314:3: note: 'sprintf' output between 7 and 9 bytes into a destination of size 7
drivers/scsi/megaraid.c:320:35: error: '%d' directive writing between 1 and 2 bytes into a region of size between 1 and 2 [-Werror=format-overflow=]
drivers/scsi/megaraid.c:320:35: note: directive argument in the range [0, 15]
drivers/scsi/megaraid.c:320:3: note: 'sprintf' output between 7 and 9 bytes into a destination of size 7

This makes the code use a truncating snprintf() instead, which shuts
up that warning.

Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 drivers/scsi/megaraid.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/scsi/megaraid.c b/drivers/scsi/megaraid.c
index 3c63c292cb92..7195cff51d4c 100644
--- a/drivers/scsi/megaraid.c
+++ b/drivers/scsi/megaraid.c
@@ -311,13 +311,15 @@ mega_query_adapter(adapter_t *adapter)
 	   right 8 bits making them zero. This 0 value was hardcoded to fix
 	   sparse warnings. */
 	if (adapter->product_info.subsysvid == PCI_VENDOR_ID_HP) {
-		sprintf (adapter->fw_version, "%c%d%d.%d%d",
+		snprintf(adapter->fw_version, sizeof(adapter->fw_version),
+			 "%c%d%d.%d%d",
 			 adapter->product_info.fw_version[2],
 			 0,
 			 adapter->product_info.fw_version[1] & 0x0f,
 			 0,
 			 adapter->product_info.fw_version[0] & 0x0f);
-		sprintf (adapter->bios_version, "%c%d%d.%d%d",
+		snprintf(adapter->bios_version, sizeof(adapter->fw_version),
+			 "%c%d%d.%d%d",
 			 adapter->product_info.bios_version[2],
 			 0,
 			 adapter->product_info.bios_version[1] & 0x0f,
-- 
2.9.0