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net/tls: Don't recursively call push_record during tls_write_space callbacks

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It is reported that in some cases, write_space may be called in
do_tcp_sendpages, such that we recursively invoke do_tcp_sendpages again:

[  660.468802]  ? do_tcp_sendpages+0x8d/0x580
[  660.468826]  ? tls_push_sg+0x74/0x130 [tls]
[  660.468852]  ? tls_push_record+0x24a/0x390 [tls]
[  660.468880]  ? tls_write_space+0x6a/0x80 [tls]
...

tls_push_sg already does a loop over all sending sg's, so ignore
any tls_write_space notifications until we are done sending.
We then have to call the previous write_space to wake up
poll() waiters after we are done with the send loop.

Reported-by: Andre Tomt <andre@tomt.net>
Signed-off-by: Dave Watson <davejwatson@fb.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Dave Watson 2018-05-01 13:05:39 -07:00 • committed by David S. Miller
parent edd7ceb782
commit c212d2c7fc
2 changed files with 8 additions and 0 deletions
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1
include/net/tls.h
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@ -148,6 +148,7 @@ struct tls_context {
struct scatterlist *partially_sent_record;
u16 partially_sent_offset;
unsigned long flags;
bool in_tcp_sendpages;
u16 pending_open_record_frags;
int (*push_pending_record)(struct sock *sk, int flags);