From d10523d0b3d78153ee58d19853ced26c9004c8c4 Mon Sep 17 00:00:00 2001 From: Jakub Kicinski Date: Wed, 27 Nov 2019 12:16:40 -0800 Subject: [PATCH] net/tls: free the record on encryption error When tls_do_encryption() fails the SG lists are left with the SG_END and SG_CHAIN marks in place. One could hope that once encryption fails we will never see the record again, but that is in fact not true. Commit d3b18ad31f93 ("tls: add bpf support to sk_msg handling") added special handling to ENOMEM and ENOSPC errors which mean we may see the same record re-submitted. As suggested by John free the record, the BPF code is already doing just that. Reported-by: syzbot+df0d4ec12332661dd1f9@syzkaller.appspotmail.com Fixes: d3b18ad31f93 ("tls: add bpf support to sk_msg handling") Signed-off-by: Jakub Kicinski Reviewed-by: Simon Horman Acked-by: John Fastabend Signed-off-by: David S. Miller --- net/tls/tls_sw.c | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-) diff --git a/net/tls/tls_sw.c b/net/tls/tls_sw.c index 70e3c0c..dbba51b 100644 --- a/net/tls/tls_sw.c +++ b/net/tls/tls_sw.c @@ -771,8 +771,14 @@ static int bpf_exec_tx_verdict(struct sk_msg *msg, struct sock *sk, policy = !(flags & MSG_SENDPAGE_NOPOLICY); psock = sk_psock_get(sk); - if (!psock || !policy) - return tls_push_record(sk, flags, record_type); + if (!psock || !policy) { + err = tls_push_record(sk, flags, record_type); + if (err) { + *copied -= sk_msg_free(sk, msg); + tls_free_open_rec(sk); + } + return err; + } more_data: enospc = sk_msg_full(msg); if (psock->eval == __SK_NONE) { -- 2.7.4