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fix - ensure we don't use bootconsoles after init has been released

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Gerd Hoffmann pointed out that my patch from yesterday can lead
to a null pointer dereference if the kernel is booted with no
console, and no earlyprintk defined. This fixes that issue.

Signed-off-by: Robin Getz <rgetz@blackfin.uclinux.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Robin Getz 2007-08-21 23:14:58 -04:00 committed by Linus Torvalds
parent 15f6ddc7d9
commit cb00e99c0a
1 changed files with 6 additions and 4 deletions
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10
kernel/printk.c
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@ -1085,10 +1085,12 @@ EXPORT_SYMBOL(unregister_console);
static int __init disable_boot_consoles(void)
{
if (console_drivers->flags & CON_BOOT) {
printk(KERN_INFO "turn off boot console %s%d\n",
console_drivers->name, console_drivers->index);
return unregister_console(console_drivers);
if (console_drivers != NULL) {
if (console_drivers->flags & CON_BOOT) {
printk(KERN_INFO "turn off boot console %s%d\n",
console_drivers->name, console_drivers->index);
return unregister_console(console_drivers);
}
}
return 0;
}