netdev - [PATCH] ethtool: zero initialize coalesce struct

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Message-Id: <20181215011923.246179-1-zenczykowski@gmail.com>
Date:   Fri, 14 Dec 2018 17:19:23 -0800
From:   Maciej Żenczykowski <zenczykowski@...il.com>
To:     Maciej Żenczykowski <maze@...gle.com>,
        Jeff Garzik <jgarzik@...ox.com>,
        Ben Hutchings <ben@...adent.org.uk>
Cc:     "David S . Miller" <davem@...emloft.net>,
        David Decotigny <decot@...gle.com>, netdev@...r.kernel.org
Subject: [PATCH] ethtool: zero initialize coalesce struct

From: Maciej Żenczykowski <maze@...gle.com>

prior to fetching it from kernel.

Otherwise we run the risk of very tail portion of it (dmac field)
being left entirely uninitialized, and likely containing some sort
of stale data.

It seems to likely be some sort of time (a second's counter).

Tested:
  'ethtool -c eth1' with old kernel now reports 'dmac: 0' where
  previously it reported some sort of second counter.

Signed-off-by: Maciej Żenczykowski <maze@...gle.com>
---
 ethtool.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/ethtool.c b/ethtool.c
index 2f7e96bb58db..465eeecb9318 100644
--- a/ethtool.c
+++ b/ethtool.c
@@ -2076,7 +2076,7 @@ static int do_gchannels(struct cmd_context *ctx)
 
 static int do_gcoalesce(struct cmd_context *ctx)
 {
-	struct ethtool_coalesce ecoal;
+	struct ethtool_coalesce ecoal = {};
 	int err;
 
 	if (ctx->argc != 0)
-- 
2.20.0.405.gbc1bbc6f85-goog