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authorWill Newton <will.newton@gmail.com>2008-12-01 11:36:06 +0000
committerLinus Torvalds <torvalds@linux-foundation.org>2008-12-01 08:19:10 -0800
commit296fa7f6a3f3342d40df7713e74246198295654b (patch)
tree01ba0ee814b6281ea22bfd33885e18741d7234c4
parentb4dcfbee3b536c9125762e8f6681ac6be0e9256b (diff)
downloadlinux-stericsson-296fa7f6a3f3342d40df7713e74246198295654b.tar.gz
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: Will Newton <will.newton@gmail.com> Signed-off-by: Alan Cox <alan@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--drivers/char/tty_io.c15
1 files changed, 9 insertions, 6 deletions
diff --git a/drivers/char/tty_io.c b/drivers/char/tty_io.c
index 59f472143f08..1412a8d1e58d 100644
--- a/drivers/char/tty_io.c
+++ b/drivers/char/tty_io.c
@@ -1795,12 +1795,15 @@ retry_open:
}
#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;