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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>
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1 changed files with 9 additions and 6 deletions
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@ -1795,12 +1795,15 @@ static int __tty_open(struct inode *inode, struct file *filp)
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}
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#endif
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if (device == MKDEV(TTYAUX_MAJOR, 1)) {
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driver = tty_driver_kref_get(console_device(&index));
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if (driver) {
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/* Don't let /dev/console block */
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filp->f_flags |= O_NONBLOCK;
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noctty = 1;
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goto got_driver;
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struct tty_driver *console_driver = console_device(&index);
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if (console_driver) {
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driver = tty_driver_kref_get(console_driver);
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if (driver) {
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/* Don't let /dev/console block */
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filp->f_flags |= O_NONBLOCK;
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noctty = 1;
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goto got_driver;
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}
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}
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mutex_unlock(&tty_mutex);
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return -ENODEV;
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