linux-kernel - [PATCH AUTOSEL 4.9 60/98] sctp: use right member as the param of list_for_each

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Message-Id: <20181025141423.213774-60-sashal@kernel.org>
Date:   Thu, 25 Oct 2018 10:13:45 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     stable@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Xin Long <lucien.xin@...il.com>,
        "David S . Miller" <davem@...emloft.net>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH AUTOSEL 4.9 60/98] sctp: use right member as the param of list_for_each_entry

From: Xin Long <lucien.xin@...il.com>

[ Upstream commit a8dd397903a6e57157f6265911f7d35681364427 ]

Commit d04adf1b3551 ("sctp: reset owner sk for data chunks on out queues
when migrating a sock") made a mistake that using 'list' as the param of
list_for_each_entry to traverse the retransmit, sacked and abandoned
queues, while chunks are using 'transmitted_list' to link into these
queues.

It could cause NULL dereference panic if there are chunks in any of these
queues when peeling off one asoc.

So use the chunk member 'transmitted_list' instead in this patch.

Fixes: d04adf1b3551 ("sctp: reset owner sk for data chunks on out queues when migrating a sock")
Signed-off-by: Xin Long <lucien.xin@...il.com>
Acked-by: Marcelo Ricardo Leitner <marcelo.leitner@...il.com>
Acked-by: Neil Horman <nhorman@...driver.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 net/sctp/socket.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/net/sctp/socket.c b/net/sctp/socket.c
index 64d2d9ea2f8c..16aa8673f918 100644
--- a/net/sctp/socket.c
+++ b/net/sctp/socket.c
@@ -185,13 +185,13 @@ static void sctp_for_each_tx_datachunk(struct sctp_association *asoc,
 		list_for_each_entry(chunk, &t->transmitted, transmitted_list)
 			cb(chunk);
 
-	list_for_each_entry(chunk, &q->retransmit, list)
+	list_for_each_entry(chunk, &q->retransmit, transmitted_list)
 		cb(chunk);
 
-	list_for_each_entry(chunk, &q->sacked, list)
+	list_for_each_entry(chunk, &q->sacked, transmitted_list)
 		cb(chunk);
 
-	list_for_each_entry(chunk, &q->abandoned, list)
+	list_for_each_entry(chunk, &q->abandoned, transmitted_list)
 		cb(chunk);
 
 	list_for_each_entry(chunk, &q->out_chunk_list, list)
-- 
2.17.1