netdev - [PATCH] genetlink: fix genl_set

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Message-Id: <1385054428-6447-1-git-send-email-johannes@sipsolutions.net>
Date:	Thu, 21 Nov 2013 18:20:28 +0100
From:	Johannes Berg <johannes@...solutions.net>
To:	netdev@...r.kernel.org
Cc:	Johannes Berg <johannes.berg@...el.com>
Subject: [PATCH] genetlink: fix genl_set_err() group ID

From: Johannes Berg <johannes.berg@...el.com>

Fix another really stupid bug - I introduced genl_set_err()
precisely to be able to adjust the group and reject invalid
ones, but then forgot to do so.

Signed-off-by: Johannes Berg <johannes.berg@...el.com>
---
 include/net/genetlink.h | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/include/net/genetlink.h b/include/net/genetlink.h
index 771af09..1b177ed 100644
--- a/include/net/genetlink.h
+++ b/include/net/genetlink.h
@@ -384,6 +384,9 @@ static inline struct sk_buff *genlmsg_new(size_t payload, gfp_t flags)
 static inline int genl_set_err(struct genl_family *family, struct net *net,
 			       u32 portid, u32 group, int code)
 {
+	if (WARN_ON_ONCE(group >= family->n_mcgrps))
+		return -EINVAL;
+	group = family->mcgrp_offset + group;
 	return netlink_set_err(net->genl_sock, portid, group, code);
 }
 
-- 
1.8.4.rc3

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