netdev - [PATCH net-next] ethtool: exit the loop when invalid index occurs

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Message-Id: <1398586838-21474-1-git-send-email-sakiwit@gmail.com>
Date:	Sun, 27 Apr 2014 02:20:38 -0600
From:	Jean Sacren <sakiwit@...il.com>
To:	netdev@...r.kernel.org
Cc:	Venkata Duvvuru <VenkatKumar.Duvvuru@...lex.Com>
Subject: [PATCH net-next] ethtool: exit the loop when invalid index occurs

The commit 3de0b592394d ("ethtool: Support for configurable RSS hash
key") introduced a new function ethtool_copy_validate_indir() with
full iteration of the loop to validate the ring indices, which could
be an overkill. To minimize the impact, we ought to exit the loop as
soon as the invalid index occurs for the very first time. The
remaining loop simply doesn't serve any more purpose.

Signed-off-by: Jean Sacren <sakiwit@...il.com>
Cc: Venkata Duvvuru <VenkatKumar.Duvvuru@...lex.Com>
---
 net/core/ethtool.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/net/core/ethtool.c b/net/core/ethtool.c
index 1d72786ef866..aa8978ac47d2 100644
--- a/net/core/ethtool.c
+++ b/net/core/ethtool.c
@@ -568,8 +568,10 @@ static int ethtool_copy_validate_indir(u32 *indir, void __user *useraddr,
 
 	/* Validate ring indices */
 	for (i = 0; i < size; i++) {
-		if (indir[i] >= rx_rings->data)
+		if (indir[i] >= rx_rings->data) {
 			ret = -EINVAL;
+			break;
+		}
 	}
 	return ret;
 }
--
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