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Fix a corner case in my previous commit.

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Even though there are not many setups that have absolutely no console
device, make sure a close() on a TTY doesn't dereference a null pointer.
This commit is contained in:
Ed Schouten 2009-01-02 23:39:29 +00:00
parent 916501c81c
commit bcca92c0e5
1 changed files with 2 additions and 1 deletions
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3
sys/kern/tty.c
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@ -312,7 +312,8 @@ ttydev_close(struct cdev *dev, int fflag, int devtype, struct thread *td)
* Don't actually close the device if it is being used as the
* console.
*/
if (strcmp(dev_console_filename, tty_devname(tp)) == 0)
if (dev_console_filename != NULL &&
strcmp(dev_console_filename, tty_devname(tp)) == 0)
return (0);
tty_lock(tp);