netdev - [PATCH] ila: Fix rhashtable walker list corruption

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Date:   Tue, 26 Mar 2019 13:50:14 +0800
From:   Herbert Xu <herbert@...dor.apana.org.au>
To:     "David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org
Cc:     Tom Herbert <tom@...bertland.com>, Tom Herbert <tom@...ntonium.net>
Subject: [PATCH] ila: Fix rhashtable walker list corruption

ila_xlat_nl_cmd_flush uses rhashtable walkers allocated from the
stack but it never frees them.  This corrupts the walker list of
the hash table.

This patch fixes it.

Reported-by: syzbot+dae72a112334aa65a159@...kaller.appspotmail.com
Fixes: b6e71bdebb12 ("ila: Flush netlink command to clear xlat...")
Signed-off-by: Herbert Xu <herbert@...dor.apana.org.au>

diff --git a/net/ipv6/ila/ila_xlat.c b/net/ipv6/ila/ila_xlat.c
index 79d2e43c05c5..5fc1f4e0c0cf 100644
--- a/net/ipv6/ila/ila_xlat.c
+++ b/net/ipv6/ila/ila_xlat.c
@@ -417,6 +417,7 @@ int ila_xlat_nl_cmd_flush(struct sk_buff *skb, struct genl_info *info)

 done:
 	rhashtable_walk_stop(&iter);
+	rhashtable_walk_exit(&iter);
 	return ret;
 }

-- 
Email: Herbert Xu <herbert@...dor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt