linux-kernel - [PATCH 4.19 028/134] ila: Fix rhashtable walker list corruption

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Date:   Mon,  1 Apr 2019 19:01:04 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        syzbot+dae72a112334aa65a159@...kaller.appspotmail.com,
        Herbert Xu <herbert@...dor.apana.org.au>,
        "David S. Miller" <davem@...emloft.net>
Subject: [PATCH 4.19 028/134] ila: Fix rhashtable walker list corruption

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

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

From: Herbert Xu <herbert@...dor.apana.org.au>

[ Upstream commit b5f9bd15b88563b55a99ed588416881367a0ce5f ]

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>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 net/ipv6/ila/ila_xlat.c |    1 +
 1 file changed, 1 insertion(+)

--- a/net/ipv6/ila/ila_xlat.c
+++ b/net/ipv6/ila/ila_xlat.c
@@ -420,6 +420,7 @@ int ila_xlat_nl_cmd_flush(struct sk_buff
 
 done:
 	rhashtable_walk_stop(&iter);
+	rhashtable_walk_exit(&iter);
 	return ret;
 }