From 3ddc2a10070675fc93cf36d0496ba5bf78ef667a Mon Sep 17 00:00:00 2001 From: Ursula Braun Date: Thu, 11 Apr 2019 11:17:34 +0200 Subject: net/smc: move unhash before release of clcsock [ Upstream commit f61bca58f6c36e666c2b807697f25e5e98708162 ] 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 Signed-off-by: Ursula Braun Signed-off-by: David S. Miller Signed-off-by: Sasha Levin --- net/smc/af_smc.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/net/smc/af_smc.c b/net/smc/af_smc.c index e6e506b2db99..9bbab6ba2dab 100644 --- a/net/smc/af_smc.c +++ b/net/smc/af_smc.c @@ -848,11 +848,11 @@ 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; @@ -903,11 +903,11 @@ 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; } @@ -932,6 +932,7 @@ 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; @@ -947,7 +948,6 @@ 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 */ } -- cgit v1.2.3