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net/smc: Ensure correct state of the socket in send path 

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: e0e4b8fa53 ("net/smc: Add SMC statistics support")
Reported-by: syzbot+5dda108b672b54141857@syzkaller.appspotmail.com
Reviewed-by: Karsten Graul <kgraul@linux.ibm.com>
Signed-off-by: Guvenc Gulce <guvenc@linux.ibm.com>
Signed-off-by: Karsten Graul <kgraul@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Guvenc Gulce 2021-06-25 17:11:02 +02:00 committed by David S. Miller
parent 4e3db44a24
commit 17081633e2
1 changed files with 3 additions and 2 deletions
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5
net/smc/smc_tx.c
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@ -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)