linux-kernel - [PATCH AUTOSEL for 4.9 083/100] ixgbe: fix use of uninitialized padding

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Date:   Wed, 13 Dec 2017 01:57:43 +0000
From:   alexander.levin@...izon.com
To:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>
Cc:     Emil Tantilov <emil.s.tantilov@...el.com>,
        Jeff Kirsher <jeffrey.t.kirsher@...el.com>,
        alexander.levin@...izon.com
Subject: [PATCH AUTOSEL for 4.9 083/100] ixgbe: fix use of uninitialized
 padding

From: Emil Tantilov <emil.s.tantilov@...el.com>

[ Upstream commit dcfd6b839c998bc9838e2a47f44f37afbdf3099c ]

This patch is resolving Coverity hits where padding in a structure could
be used uninitialized.

- Initialize fwd_cmd.pad/2 before ixgbe_calculate_checksum()

- Initialize buffer.pad2/3 before ixgbe_hic_unlocked()

Signed-off-by: Emil Tantilov <emil.s.tantilov@...el.com>
Tested-by: Andrew Bowers <andrewx.bowers@...el.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
Signed-off-by: Sasha Levin <alexander.levin@...izon.com>
---
 drivers/net/ethernet/intel/ixgbe/ixgbe_common.c | 4 ++--
 drivers/net/ethernet/intel/ixgbe/ixgbe_x550.c   | 2 ++
 2 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_common.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_common.c
index 77d3039283f6..ad3362293cbd 100644
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_common.c
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_common.c
@@ -3696,10 +3696,10 @@ s32 ixgbe_set_fw_drv_ver_generic(struct ixgbe_hw *hw, u8 maj, u8 min,
 	fw_cmd.ver_build = build;
 	fw_cmd.ver_sub = sub;
 	fw_cmd.hdr.checksum = 0;
-	fw_cmd.hdr.checksum = ixgbe_calculate_checksum((u8 *)&fw_cmd,
-				(FW_CEM_HDR_LEN + fw_cmd.hdr.buf_len));
 	fw_cmd.pad = 0;
 	fw_cmd.pad2 = 0;
+	fw_cmd.hdr.checksum = ixgbe_calculate_checksum((u8 *)&fw_cmd,
+				(FW_CEM_HDR_LEN + fw_cmd.hdr.buf_len));
 
 	for (i = 0; i <= FW_CEM_MAX_RETRIES; i++) {
 		ret_val = ixgbe_host_interface_command(hw, &fw_cmd,
diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_x550.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_x550.c
index 60f0bf779073..77a60aa5dc7e 100644
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_x550.c
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_x550.c
@@ -617,6 +617,8 @@ static s32 ixgbe_read_ee_hostif_buffer_X550(struct ixgbe_hw *hw,
 		/* convert offset from words to bytes */
 		buffer.address = cpu_to_be32((offset + current_word) * 2);
 		buffer.length = cpu_to_be16(words_to_read * 2);
+		buffer.pad2 = 0;
+		buffer.pad3 = 0;
 
 		status = ixgbe_host_interface_command(hw, &buffer,
 						      sizeof(buffer),
-- 
2.11.0