linux-kernel - [PATCH] net/mlx4_en: fix off by one in error handling

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Message-Id: <alpine.LFD.2.20.1609141305360.1727@schleppi>
Date:   Wed, 14 Sep 2016 13:09:24 +0200 (CEST)
From:   Sebastian Ott <sebott@...ux.vnet.ibm.com>
To:     Yishai Hadas <yishaih@...lanox.com>,
        Tariq Toukan <tariqt@...lanox.com>
cc:     netdev@...r.kernel.org, linux-rdma@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] net/mlx4_en: fix off by one in error handling

If an error occurs in mlx4_init_eq_table the index used in the
err_out_unmap label is one too big which results in a panic in
mlx4_free_eq. This patch fixes the index in the error path.

Signed-off-by: Sebastian Ott <sebott@...ux.vnet.ibm.com>
---
 drivers/net/ethernet/mellanox/mlx4/eq.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlx4/eq.c b/drivers/net/ethernet/mellanox/mlx4/eq.c
index f613977..cf8f8a7 100644
--- a/drivers/net/ethernet/mellanox/mlx4/eq.c
+++ b/drivers/net/ethernet/mellanox/mlx4/eq.c
@@ -1305,8 +1305,8 @@ int mlx4_init_eq_table(struct mlx4_dev *dev)
 	return 0;
 
 err_out_unmap:
-	while (i >= 0)
-		mlx4_free_eq(dev, &priv->eq_table.eq[i--]);
+	while (i > 0)
+		mlx4_free_eq(dev, &priv->eq_table.eq[--i]);
 #ifdef CONFIG_RFS_ACCEL
 	for (i = 1; i <= dev->caps.num_ports; i++) {
 		if (mlx4_priv(dev)->port[i].rmap) {
-- 
2.5.5