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slirp: Handle error returns from sosendoob()

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sosendoob() can return a failure code, but all its callers ignore it.
This is OK in sbappend(), as the comment there states -- we will try
again later in sowrite(). Add a (void) cast to tell Coverity so.
In sowrite() we do need to check the return value -- we should handle
a write failure in sosendoob() the same way we handle a write failure
for the normal data.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Signed-off-by: Samuel Thibault <samuel.thibault@ens-lyon.org>
This commit is contained in:
Peter Maydell 2017-07-14 12:12:25 +01:00 committed by Samuel Thibault
parent 0b466065eb
commit 75cb298d90
2 changed files with 18 additions and 7 deletions
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2
slirp/sbuf.c
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@ -91,7 +91,7 @@ sbappend(struct socket *so, struct mbuf *m)
if (so->so_urgc) {
sbappendsb(&so->so_rcv, m);
m_free(m);
sosendoob(so);
(void)sosendoob(so);
return;
}

23
slirp/socket.c
View File

@ -404,7 +404,15 @@ sowrite(struct socket *so)
DEBUG_ARG("so = %p", so);
if (so->so_urgc) {
sosendoob(so);
uint32_t expected = so->so_urgc;
if (sosendoob(so) < expected) {
/* Treat a short write as a fatal error too,
* rather than continuing on and sending the urgent
* data as if it were non-urgent and leaving the
* so_urgc count wrong.
*/
goto err_disconnected;
}
if (sb->sb_cc == 0)
return 0;
}
@ -448,11 +456,7 @@ sowrite(struct socket *so)
return 0;
if (nn <= 0) {
DEBUG_MISC((dfd, " --- sowrite disconnected, so->so_state = %x, errno = %d\n",
so->so_state, errno));
sofcantsendmore(so);
tcp_sockclosed(sototcpcb(so));
return -1;
goto err_disconnected;
}
#ifndef HAVE_READV
@ -479,6 +483,13 @@ sowrite(struct socket *so)
sofcantsendmore(so);
return nn;
err_disconnected:
DEBUG_MISC((dfd, " --- sowrite disconnected, so->so_state = %x, errno = %d\n",
so->so_state, errno));
sofcantsendmore(so);
tcp_sockclosed(sototcpcb(so));
return -1;
}
/*