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authorUrsula Braun <ubraun@linux.ibm.com>2019-04-11 11:17:34 +0200
committerDavid S. Miller <davem@davemloft.net>2019-04-11 11:04:08 -0700
commitf61bca58f6c36e666c2b807697f25e5e98708162 (patch)
treef02f6529ea09b2bb02f173e11e5c8c53abe69ab9 /net/smc/af_smc.c
parent8ef659f1a840c953a59442ff1400ec73baf3b601 (diff)
net/smc: move unhash before release of clcsock
Commit <26d92e951fe0> ("net/smc: move unhash as early as possible in smc_release()") fixes one occurrence in the smc code, but the same pattern exists in other places. This patch covers the remaining occurrences and makes sure, the unhash operation is done before the smc->clcsock is released. This avoids a potential use-after-free in smc_diag_dump(). Reviewed-by: Karsten Graul <kgraul@linux.ibm.com> Signed-off-by: Ursula Braun <ubraun@linux.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/smc/af_smc.c')
-rw-r--r--net/smc/af_smc.c6
1 files changed, 3 insertions, 3 deletions
diff --git a/net/smc/af_smc.c b/net/smc/af_smc.c
index d2a0d15f809c..6f869ef49b32 100644
--- a/net/smc/af_smc.c
+++ b/net/smc/af_smc.c
@@ -884,11 +884,11 @@ static int smc_clcsock_accept(struct smc_sock *lsmc, struct smc_sock **new_smc)
if (rc < 0)
lsk->sk_err = -rc;
if (rc < 0 || lsk->sk_state == SMC_CLOSED) {
+ new_sk->sk_prot->unhash(new_sk);
if (new_clcsock)
sock_release(new_clcsock);
new_sk->sk_state = SMC_CLOSED;
sock_set_flag(new_sk, SOCK_DEAD);
- new_sk->sk_prot->unhash(new_sk);
sock_put(new_sk); /* final */
*new_smc = NULL;
goto out;
@@ -939,11 +939,11 @@ struct sock *smc_accept_dequeue(struct sock *parent,
smc_accept_unlink(new_sk);
if (new_sk->sk_state == SMC_CLOSED) {
+ new_sk->sk_prot->unhash(new_sk);
if (isk->clcsock) {
sock_release(isk->clcsock);
isk->clcsock = NULL;
}
- new_sk->sk_prot->unhash(new_sk);
sock_put(new_sk); /* final */
continue;
}
@@ -973,6 +973,7 @@ void smc_close_non_accepted(struct sock *sk)
sock_set_flag(sk, SOCK_DEAD);
sk->sk_shutdown |= SHUTDOWN_MASK;
}
+ sk->sk_prot->unhash(sk);
if (smc->clcsock) {
struct socket *tcp;
@@ -988,7 +989,6 @@ void smc_close_non_accepted(struct sock *sk)
smc_conn_free(&smc->conn);
}
release_sock(sk);
- sk->sk_prot->unhash(sk);
sock_put(sk); /* final sock_put */
}