提交 296fa7f6 编写于 作者: W Will Newton 提交者: Linus Torvalds

drivers/char/tty_io.c: Avoid panic when no console is configured.

When no console is configured tty_open tries to call kref_get on a NULL
pointer, return ENODEV instead.
Signed-off-by: NWill Newton <will.newton@gmail.com>
Signed-off-by: NAlan Cox <alan@redhat.com>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
上级 b4dcfbee
......@@ -1795,12 +1795,15 @@ static int __tty_open(struct inode *inode, struct file *filp)
}
#endif
if (device == MKDEV(TTYAUX_MAJOR, 1)) {
driver = tty_driver_kref_get(console_device(&index));
if (driver) {
/* Don't let /dev/console block */
filp->f_flags |= O_NONBLOCK;
noctty = 1;
goto got_driver;
struct tty_driver *console_driver = console_device(&index);
if (console_driver) {
driver = tty_driver_kref_get(console_driver);
if (driver) {
/* Don't let /dev/console block */
filp->f_flags |= O_NONBLOCK;
noctty = 1;
goto got_driver;
}
}
mutex_unlock(&tty_mutex);
return -ENODEV;
......
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