linux-kernel - [PATCH 4.9 002/172] net: dont call strlen on non-terminated string in dev_set

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Message-Id: <20170703133414.371096337@linuxfoundation.org>
Date:   Mon,  3 Jul 2017 15:33:02 +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, Alexander Potapenko <glider@...gle.com>,
        "David S. Miller" <davem@...emloft.net>
Subject: [PATCH 4.9 002/172] net: dont call strlen on non-terminated string in dev_set_alias()

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

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

From: Alexander Potapenko <glider@...gle.com>


[ Upstream commit c28294b941232931fbd714099798eb7aa7e865d7 ]

KMSAN reported a use of uninitialized memory in dev_set_alias(),
which was caused by calling strlcpy() (which in turn called strlen())
on the user-supplied non-terminated string.

Signed-off-by: Alexander Potapenko <glider@...gle.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 net/core/dev.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -1250,8 +1250,9 @@ int dev_set_alias(struct net_device *dev
 	if (!new_ifalias)
 		return -ENOMEM;
 	dev->ifalias = new_ifalias;
+	memcpy(dev->ifalias, alias, len);
+	dev->ifalias[len] = 0;
 
-	strlcpy(dev->ifalias, alias, len+1);
 	return len;
 }