linux-kernel - [patch 2/6] Staging: gdm72xx: silence underflow warning in netlink

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Date:	Mon, 22 Feb 2016 22:31:31 +0300
From:	Dan Carpenter <dan.carpenter@...cle.com>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:	Alison Schofield <amsfield22@...il.com>,
	Masanari Iida <standby24x7@...il.com>,
	Shraddha Barke <shraddha.6596@...il.com>,
	devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org,
	kernel-janitors@...r.kernel.org
Subject: [patch 2/6] Staging: gdm72xx: silence underflow warning in
 netlink_send()

The value of "group" comes from "idx" in __gdm_wimax_event_send():

	if (sscanf(e->dev->name, "wm%d", &idx) == 1)

Smatch marks sscanf values as user controlled.  It's supposed to be a
number in 0-30 range.  We cap the upper bound but allow negatives.  Fix
this by making it type u16 instead.

Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>

diff --git a/drivers/staging/gdm72xx/netlink_k.h b/drivers/staging/gdm72xx/netlink_k.h
index 1fe7198..1914347 100644
--- a/drivers/staging/gdm72xx/netlink_k.h
+++ b/drivers/staging/gdm72xx/netlink_k.h
@@ -20,6 +20,6 @@
 struct sock *netlink_init(int unit, void (*cb)(struct net_device *dev, u16 type,
 					       void *msg, int len));
 void netlink_exit(struct sock *sock);
-int netlink_send(struct sock *sock, int group, u16 type, void *msg, int len);
+int netlink_send(struct sock *sock, u16 group, u16 type, void *msg, int len);
 
 #endif /* __GDM72XX_NETLINK_K_H__ */
diff --git a/drivers/staging/gdm72xx/netlink_k.c b/drivers/staging/gdm72xx/netlink_k.c
index 4089b17..96c9034 100644
--- a/drivers/staging/gdm72xx/netlink_k.c
+++ b/drivers/staging/gdm72xx/netlink_k.c
@@ -114,7 +114,7 @@ void netlink_exit(struct sock *sock)
 	netlink_kernel_release(sock);
 }
 
-int netlink_send(struct sock *sock, int group, u16 type, void *msg, int len)
+int netlink_send(struct sock *sock, u16 group, u16 type, void *msg, int len)
 {
 	static u32 seq;
 	struct sk_buff *skb = NULL;