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tls: Stricter error checking in zerocopy sendmsg path 

In the zerocopy sendmsg() path, there are error checks to revert
the zerocopy if we get any error code.  syzkaller has discovered
that tls_push_record can return -ECONNRESET, which is fatal, and
happens after the point at which it is safe to revert the iter,
as we've already passed the memory to do_tcp_sendpages.

Previously this code could return -ENOMEM and we would want to
revert the iter, but AFAIK this no longer returns ENOMEM after
a447da7d00 ("tls: fix waitall behavior in tls_sw_recvmsg"),
so we fail for all error codes.

Reported-by: syzbot+c226690f7b3126c5ee04@syzkaller.appspotmail.com
Reported-by: syzbot+709f2810a6a05f11d4d3@syzkaller.appspotmail.com
Signed-off-by: Dave Watson <davejwatson@fb.com>
Fixes: 3c4d755915 ("tls: kernel TLS support")
Signed-off-by: David S. Miller <davem@davemloft.net>
zero-colors
Dave Watson 2018-07-12 08:03:43 -07:00 committed by David S. Miller
parent 24d4e34f7a
commit 32da12216e
1 changed files with 1 additions and 1 deletions
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2
net/tls/tls_sw.c
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@ -440,7 +440,7 @@ alloc_encrypted:
ret = tls_push_record(sk, msg->msg_flags, record_type);
if (!ret)
continue;
if (ret == -EAGAIN)
if (ret < 0)
goto send_end;
copied -= try_to_copy;