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chardev: fix qemu_chr_open_fd() with fd_in==fd_out

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The "serial" chardev calls qemu_chr_open_fd() with the same fd. This
may lead to double-close as each QIOChannel owns the fd.

Instead, share the reference to the same QIOChannel.

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
This commit is contained in:
Marc-André Lureau 2021-07-23 13:59:50 +04:00
parent 46fe3ff6ea
commit 733ba02084
1 changed files with 15 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

19
chardev/char-fd.c
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@ -211,20 +211,31 @@ void qemu_chr_open_fd(Chardev *chr,
int fd_in, int fd_out)
{
FDChardev *s = FD_CHARDEV(chr);
char *name;
g_autofree char *name = NULL;
if (fd_out >= 0) {
qemu_set_nonblock(fd_out);
}
if (fd_out == fd_in && fd_in >= 0) {
s->ioc_in = QIO_CHANNEL(qio_channel_file_new_fd(fd_in));
name = g_strdup_printf("chardev-file-%s", chr->label);
qio_channel_set_name(QIO_CHANNEL(s->ioc_in), name);
s->ioc_out = QIO_CHANNEL(object_ref(s->ioc_in));
return;
}
if (fd_in >= 0) {
s->ioc_in = QIO_CHANNEL(qio_channel_file_new_fd(fd_in));
name = g_strdup_printf("chardev-file-in-%s", chr->label);
qio_channel_set_name(QIO_CHANNEL(s->ioc_in), name);
g_free(name);
}
if (fd_out >= 0) {
s->ioc_out = QIO_CHANNEL(qio_channel_file_new_fd(fd_out));
g_free(name);
name = g_strdup_printf("chardev-file-out-%s", chr->label);
qio_channel_set_name(QIO_CHANNEL(s->ioc_out), name);
g_free(name);
qemu_set_nonblock(fd_out);
}
}