linux-kernel - [PATCH 4.4 15/93] i40e: avoid null pointer dereference

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Message-Id: <20161006074731.770610117@linuxfoundation.org>
Date:   Thu,  6 Oct 2016 10:28:45 +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, Heinrich Schuchardt <xypron.glpk@....de>,
        Andrew Bowers <andrewx.bowers@...el.com>,
        Jeff Kirsher <jeffrey.t.kirsher@...el.com>
Subject: [PATCH 4.4 15/93] i40e: avoid null pointer dereference

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

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

From: Heinrich Schuchardt <xypron.glpk@....de>

commit cd956722167ba4fdba9c1ce3eed251b04ea2e10f upstream.

In function i40e_debug_aq parameter desc is assumed to be
possibly NULL. Do not dereference it before checking the
value.

Fixes: f905dd62be88 ("i40e/i40evf: add max buf len to aq debug print helper")
Signed-off-by: Heinrich Schuchardt <xypron.glpk@....de>
Tested-by: Andrew Bowers <andrewx.bowers@...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/i40e/i40e_common.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

--- a/drivers/net/ethernet/intel/i40e/i40e_common.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_common.c
@@ -302,13 +302,15 @@ void i40e_debug_aq(struct i40e_hw *hw, e
 		   void *buffer, u16 buf_len)
 {
 	struct i40e_aq_desc *aq_desc = (struct i40e_aq_desc *)desc;
-	u16 len = le16_to_cpu(aq_desc->datalen);
+	u16 len;
 	u8 *buf = (u8 *)buffer;
 	u16 i = 0;
 
 	if ((!(mask & hw->debug_mask)) || (desc == NULL))
 		return;
 
+	len = le16_to_cpu(aq_desc->datalen);
+
 	i40e_debug(hw, mask,
 		   "AQ CMD: opcode 0x%04X, flags 0x%04X, datalen 0x%04X, retval 0x%04X\n",
 		   le16_to_cpu(aq_desc->opcode),