linux-kernel - [PATCH 4.9 005/241] staging: wilc1000: add check for kmalloc allocation failure.

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Date:   Mon, 19 Mar 2018 19:04:30 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Colin Ian King <colin.king@...onical.com>,
        Sasha Levin <alexander.levin@...rosoft.com>
Subject: [PATCH 4.9 005/241] staging: wilc1000: add check for kmalloc allocation failure.

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

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

From: Colin Ian King <colin.king@...onical.com>


[ Upstream commit 6cc0c259d034c6ab48f4e12f505213988e73d380 ]

Add a sanity check that wid.val has been allocated, fixes a null
pointer deference on stamac when calling ether_add_copy.

Detected by CoverityScan, CID#1369537 ("Dereference null return value")

Signed-off-by: Colin Ian King <colin.king@...onical.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/staging/wilc1000/host_interface.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/drivers/staging/wilc1000/host_interface.c
+++ b/drivers/staging/wilc1000/host_interface.c
@@ -1930,6 +1930,8 @@ static s32 Handle_Get_InActiveTime(struc
 	wid.type = WID_STR;
 	wid.size = ETH_ALEN;
 	wid.val = kmalloc(wid.size, GFP_KERNEL);
+	if (!wid.val)
+		return -ENOMEM;
 
 	stamac = wid.val;
 	memcpy(stamac, strHostIfStaInactiveT->mac, ETH_ALEN);