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[V1,net,8/8] net: ena: gcc 8: fix compilation warning

Message ID 20190501134710.8938-9-sameehj@amazon.com
State Accepted
Delegated to: David Miller
Headers show
Series Bug fixes for ENA Ethernet driver | expand

Commit Message

Jubran, Samih May 1, 2019, 1:47 p.m. UTC 
From: Sameeh Jubran <sameehj@amazon.com>

GCC 8 contains a number of new warnings as well as enhancements to existing
checkers. The warning - Wstringop-truncation - warns for calls to bounded
string manipulation functions such as strncat, strncpy, and stpncpy that
may either truncate the copied string or leave the destination unchanged.

In our case the destination string length (32 bytes) is much shorter than
the source string (64 bytes) which causes this warning to show up. In
general the destination has to be at least a byte larger than the length
of the source string with strncpy for this warning not to showup.

This can be easily fixed by using strlcpy instead which already does the
truncation to the string. Documentation for this function can be
found here:

https://elixir.bootlin.com/linux/latest/source/lib/string.c#L141

Fixes: 1738cd3ed342 ("net: ena: Add a driver for Amazon Elastic Network Adapters (ENA)")

Signed-off-by: Sameeh Jubran <sameehj@amazon.com>
---
 drivers/net/ethernet/amazon/ena/ena_netdev.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
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Patch

diff --git a/drivers/net/ethernet/amazon/ena/ena_netdev.c b/drivers/net/ethernet/amazon/ena/ena_netdev.c
index 03244155f74c..bc5997a5f809 100644
--- a/drivers/net/ethernet/amazon/ena/ena_netdev.c
+++ b/drivers/net/ethernet/amazon/ena/ena_netdev.c
@@ -2298,7 +2298,7 @@  static void ena_config_host_info(struct ena_com_dev *ena_dev,
 	host_info->bdf = (pdev->bus->number << 8) | pdev->devfn;
 	host_info->os_type = ENA_ADMIN_OS_LINUX;
 	host_info->kernel_ver = LINUX_VERSION_CODE;
-	strncpy(host_info->kernel_ver_str, utsname()->version,
+	strlcpy(host_info->kernel_ver_str, utsname()->version,
 		sizeof(host_info->kernel_ver_str) - 1);
 	host_info->os_dist = 0;
 	strncpy(host_info->os_dist_str, utsname()->release,