netdev - [PATCH] net/neighbour: fix potential null pointer deference

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Message-Id: <1559291383-5814-1-git-send-email-92siuyang@gmail.com>
Date:   Fri, 31 May 2019 16:29:43 +0800
From:   Young Xiao <92siuyang@...il.com>
To:     davem@...emloft.net, dsahern@...il.com, roopa@...ulusnetworks.com,
        christian@...uner.io, khlebnikov@...dex-team.ru,
        netdev@...r.kernel.org
Cc:     Young Xiao <92siuyang@...il.com>
Subject: [PATCH] net/neighbour: fix potential null pointer deference

There is a possible null pointer deference bugs in neigh_fill_info(),
which is similar to the bug which was fixed in commit 6adc5fd6a142
("net/neighbour: fix crash at dumping device-agnostic proxy entries").

Signed-off-by: Young Xiao <92siuyang@...il.com>
---
 net/core/neighbour.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/core/neighbour.c b/net/core/neighbour.c
index dfa8710..33c3ff1 100644
--- a/net/core/neighbour.c
+++ b/net/core/neighbour.c
@@ -2440,7 +2440,7 @@ static int neigh_fill_info(struct sk_buff *skb, struct neighbour *neigh,
 	ndm->ndm_pad2    = 0;
 	ndm->ndm_flags	 = neigh->flags;
 	ndm->ndm_type	 = neigh->type;
-	ndm->ndm_ifindex = neigh->dev->ifindex;
+	ndm->ndm_ifindex = neigh->dev ? neigh->dev->ifindex : 0;
 
 	if (nla_put(skb, NDA_DST, neigh->tbl->key_len, neigh->primary_key))
 		goto nla_put_failure;
-- 
2.7.4