From: "David S. Miller" <davem@xxxxxxxxxxxxx>
This patch has been added to the 3.12 stable tree. If you have any
objections, please let us know.
===============
[ Upstream commit a134f083e79fb4c3d0a925691e732c56911b4326 ]
If we don't do that, then the poison value is left in the ->pprev
backlink.
This can cause crashes if we do a disconnect, followed by a connect().
Tested-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Reported-by: Wen Xu <hotdog3645@xxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Jiri Slaby <jslaby@xxxxxxx>
---
net/ipv4/ping.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/net/ipv4/ping.c b/net/ipv4/ping.c
index a9f8e66f6dad..54012b8c0ef9 100644
--- a/net/ipv4/ping.c
+++ b/net/ipv4/ping.c
@@ -154,6 +154,7 @@ void ping_unhash(struct sock *sk)
if (sk_hashed(sk)) {
write_lock_bh(&ping_table.lock);
hlist_nulls_del(&sk->sk_nulls_node);
+ sk_nulls_node_init(&sk->sk_nulls_node);
sock_put(sk);
isk->inet_num = 0;
isk->inet_sport = 0;
--
2.3.5
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