linux-kernel - [PATCH 4.7 079/141] fm10k: fix incorrect index calculation in fm10k_write

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Date:   Thu,  6 Oct 2016 10:28:35 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Jacob Keller <jacob.e.keller@...el.com>,
        Krishneil Singh <Krishneil.k.singh@...el.com>,
        Jeff Kirsher <jeffrey.t.kirsher@...el.com>
Subject: [PATCH 4.7 079/141] fm10k: fix incorrect index calculation in fm10k_write_reta

4.7-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Jacob Keller <jacob.e.keller@...el.com>

commit 34875887f360d7bd0b7f0a89f7c6d65eca616ee3 upstream.

The index calculated when looping through the indir array passed to
fm10k_write_reta was incorrectly calculated as the first part i needs to
be multiplied by 4.

Fixes: 0cfea7a65738 ("fm10k: fix possible null pointer deref after kcalloc", 2016-04-13)
Signed-off-by: Jacob Keller <jacob.e.keller@...el.com>
Tested-by: Krishneil Singh <Krishneil.k.singh@...el.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/net/ethernet/intel/fm10k/fm10k_ethtool.c |    5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

--- a/drivers/net/ethernet/intel/fm10k/fm10k_ethtool.c
+++ b/drivers/net/ethernet/intel/fm10k/fm10k_ethtool.c
@@ -983,9 +983,10 @@ void fm10k_write_reta(struct fm10k_intfc
 		/* generate a new table if we weren't given one */
 		for (j = 0; j < 4; j++) {
 			if (indir)
-				n = indir[i + j];
+				n = indir[4 * i + j];
 			else
-				n = ethtool_rxfh_indir_default(i + j, rss_i);
+				n = ethtool_rxfh_indir_default(4 * i + j,
+							       rss_i);
 
 			table[j] = n;
 		}