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Message-Id: <20210625151102.447198-1-kgraul@linux.ibm.com>
Date: Fri, 25 Jun 2021 17:11:02 +0200
From: Karsten Graul <kgraul@...ux.ibm.com>
To: David Miller <davem@...emloft.net>,
Jakub Kicinski <kuba@...nel.org>
Cc: netdev@...r.kernel.org, linux-s390@...r.kernel.org,
Heiko Carstens <hca@...ux.ibm.com>,
Guvenc Gulce <guvenc@...ux.ibm.com>
Subject: [PATCH net-next] net/smc: Ensure correct state of the socket in send path
From: Guvenc Gulce <guvenc@...ux.ibm.com>
When smc_sendmsg() is called before the SMC socket initialization has
completed, smc_tx_sendmsg() will access un-initialized fields of the
SMC socket which results in a null-pointer dereference.
Fix this by checking the socket state first in smc_tx_sendmsg().
Fixes: e0e4b8fa5338 ("net/smc: Add SMC statistics support")
Reported-by: syzbot+5dda108b672b54141857@...kaller.appspotmail.com
Reviewed-by: Karsten Graul <kgraul@...ux.ibm.com>
Signed-off-by: Guvenc Gulce <guvenc@...ux.ibm.com>
Signed-off-by: Karsten Graul <kgraul@...ux.ibm.com>
---
net/smc/smc_tx.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/net/smc/smc_tx.c b/net/smc/smc_tx.c
index 075c4f4b41cf..289025cd545a 100644
--- a/net/smc/smc_tx.c
+++ b/net/smc/smc_tx.c
@@ -154,6 +154,9 @@ int smc_tx_sendmsg(struct smc_sock *smc, struct msghdr *msg, size_t len)
goto out_err;
}
+ if (sk->sk_state == SMC_INIT)
+ return -ENOTCONN;
+
if (len > conn->sndbuf_desc->len)
SMC_STAT_RMB_TX_SIZE_SMALL(smc, !conn->lnk);
@@ -164,8 +167,6 @@ int smc_tx_sendmsg(struct smc_sock *smc, struct msghdr *msg, size_t len)
SMC_STAT_INC(smc, urg_data_cnt);
while (msg_data_left(msg)) {
- if (sk->sk_state == SMC_INIT)
- return -ENOTCONN;
if (smc->sk.sk_shutdown & SEND_SHUTDOWN ||
(smc->sk.sk_err == ECONNABORTED) ||
conn->killed)
--
2.25.1
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