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qemu-char: check errno together with ret < 0 

In the tcp_chr_write function, we checked errno,
but errno was not reset before a read or write operation.
Therefore, this check of errno's actions is often
incorrect after EAGAIN has occurred.
we need check errno together with ret < 0.

Signed-off-by: xinhua.Cao <caoxinhua@huawei.com>
Message-Id: <20180704033642.15996-1-caoxinhua@huawei.com>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Fixes: 9fc53a10f8
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
xinhua.Cao 2018-07-04 11:36:42 +08:00 committed by Paolo Bonzini
parent 02693cc4f4
commit 81e34930ce
1 changed files with 5 additions and 2 deletions
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7
chardev/char-socket.c
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@ -134,8 +134,11 @@ static int tcp_chr_write(Chardev *chr, const uint8_t *buf, int len)
s->write_msgfds,
s->write_msgfds_num);
/* free the written msgfds in any cases other than errno==EAGAIN */
if (EAGAIN != errno && s->write_msgfds_num) {
/* free the written msgfds in any cases
* other than ret < 0 && errno == EAGAIN
*/
if (!(ret < 0 && EAGAIN == errno)
&& s->write_msgfds_num) {
g_free(s->write_msgfds);
s->write_msgfds = 0;
s->write_msgfds_num = 0;