linux-kernel - [PATCH 3.4 14/27] isdnloop: Validate NUL-terminated strings from user.

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Message-Id: <20140424215552.380669343@linuxfoundation.org>
Date:	Thu, 24 Apr 2014 14:55:48 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org,
	YOSHIFUJI Hideaki <yoshfuji@...ux-ipv6.org>,
	"David S. Miller" <davem@...emloft.net>
Subject: [PATCH 3.4 14/27] isdnloop: Validate NUL-terminated strings from user.

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

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

From: YOSHIFUJI Hideaki <yoshfuji@...ux-ipv6.org>

[ Upstream commit 77bc6bed7121936bb2e019a8c336075f4c8eef62 ]

Return -EINVAL unless all of user-given strings are correctly
NUL-terminated.

Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@...ux-ipv6.org>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/isdn/isdnloop/isdnloop.c |    6 ++++++
 1 file changed, 6 insertions(+)

--- a/drivers/isdn/isdnloop/isdnloop.c
+++ b/drivers/isdn/isdnloop/isdnloop.c
@@ -1070,6 +1070,12 @@ isdnloop_start(isdnloop_card *card, isdn
 		return -EBUSY;
 	if (copy_from_user((char *) &sdef, (char *) sdefp, sizeof(sdef)))
 		return -EFAULT;
+
+	for (i = 0; i < 3; i++) {
+		if (!memchr(sdef.num[i], 0, sizeof(sdef.num[i])))
+			return -EINVAL;
+	}
+
 	spin_lock_irqsave(&card->isdnloop_lock, flags);
 	switch (sdef.ptype) {
 	case ISDN_PTYPE_EURO:


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