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passt, tap: Process data on the socket before HUP/ERR events

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In the case where the client writes a packet and then closes the
socket, because we receive EPOLLIN|EPOLLRDHUP together we have a
choice of whether to close the socket immediately, or read the packet
and then close the socket.  Choose the latter.

This should improve fuzzing coverage and arguably is a better choice
even for regular use since dropping packets on close is bad.

See-also: https://archives.passt.top/passt-dev/20221117171805.3746f53a@elisabeth/
Signed-off-by: Richard W.M. Jones <rjones@redhat.com>
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
This commit is contained in:
Richard W.M. Jones 2022-11-17 18:49:35 +00:00 committed by Stefano Brivio
parent 6b4e68383c
commit 190169c544
1 changed files with 3 additions and 3 deletions
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6
tap.c
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@ -1106,13 +1106,13 @@ void tap_handler(struct ctx *c, int fd, uint32_t events,
return; return;
} }
if (events & (EPOLLRDHUP | EPOLLHUP | EPOLLERR))
goto reinit;
if ((c->mode == MODE_PASST && tap_handler_passt(c, now)) || if ((c->mode == MODE_PASST && tap_handler_passt(c, now)) ||
(c->mode == MODE_PASTA && tap_handler_pasta(c, now))) (c->mode == MODE_PASTA && tap_handler_pasta(c, now)))
goto reinit; goto reinit;
if (events & (EPOLLRDHUP | EPOLLHUP | EPOLLERR))
goto reinit;
return; return;
reinit: reinit:
if (c->one_off) { if (c->one_off) {