netdev - [PATCH net] net/mlxfw: Fix out-of-memory error in mfa2 flash burning

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Date:   Thu, 26 Dec 2019 10:41:56 +0200
From:   Leon Romanovsky <leon@...nel.org>
To:     "David S . Miller" <davem@...emloft.net>,
        mlxsw <mlxsw@...lanox.com>
Cc:     Vladyslav Tarasiuk <vladyslavt@...lanox.com>,
        linux-netdev <netdev@...r.kernel.org>,
        Aya Levin <ayal@...lanox.com>,
        Leon Romanovsky <leonro@...lanox.com>
Subject: [PATCH net] net/mlxfw: Fix out-of-memory error in mfa2 flash burning

From: Vladyslav Tarasiuk <vladyslavt@...lanox.com>

The burning process requires to perform internal allocations of large
chunks of memory. This memory doesn't need to be contiguous and can be
safely allocated by vzalloc() instead of kzalloc(). This patch changes
such allocation to avoid possible out-of-memory failure.

Fixes: 410ed13cae39 ("Add the mlxfw module for Mellanox firmware flash process")
Signed-off-by: Vladyslav Tarasiuk <vladyslavt@...lanox.com>
Reviewed-by: Aya Levin <ayal@...lanox.com>
Signed-off-by: Leon Romanovsky <leonro@...lanox.com>
---
 drivers/net/ethernet/mellanox/mlxfw/mlxfw_mfa2.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlxfw/mlxfw_mfa2.c b/drivers/net/ethernet/mellanox/mlxfw/mlxfw_mfa2.c
index 544344ac4894..79057af4fe99 100644
--- a/drivers/net/ethernet/mellanox/mlxfw/mlxfw_mfa2.c
+++ b/drivers/net/ethernet/mellanox/mlxfw/mlxfw_mfa2.c
@@ -6,6 +6,7 @@
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/netlink.h>
+#include <linux/vmalloc.h>
 #include <linux/xz.h>
 #include "mlxfw_mfa2.h"
 #include "mlxfw_mfa2_file.h"
@@ -548,7 +549,7 @@ mlxfw_mfa2_file_component_get(const struct mlxfw_mfa2_file *mfa2_file,
 	comp_size = be32_to_cpu(comp->size);
 	comp_buf_size = comp_size + mlxfw_mfa2_comp_magic_len;

-	comp_data = kmalloc(sizeof(*comp_data) + comp_buf_size, GFP_KERNEL);
+	comp_data = vzalloc(sizeof(*comp_data) + comp_buf_size);
 	if (!comp_data)
 		return ERR_PTR(-ENOMEM);
 	comp_data->comp.data_size = comp_size;
@@ -570,7 +571,7 @@ mlxfw_mfa2_file_component_get(const struct mlxfw_mfa2_file *mfa2_file,
 	comp_data->comp.data = comp_data->buff + mlxfw_mfa2_comp_magic_len;
 	return &comp_data->comp;
 err_out:
-	kfree(comp_data);
+	vfree(comp_data);
 	return ERR_PTR(err);
 }

@@ -579,7 +580,7 @@ void mlxfw_mfa2_file_component_put(struct mlxfw_mfa2_component *comp)
 	const struct mlxfw_mfa2_comp_data *comp_data;

 	comp_data = container_of(comp, struct mlxfw_mfa2_comp_data, comp);
-	kfree(comp_data);
+	vfree(comp_data);
 }

 void mlxfw_mfa2_file_fini(struct mlxfw_mfa2_file *mfa2_file)
--
2.20.1