From cb00e99c0abd844b884c64c6b54aa3b7d345ebb1 Mon Sep 17 00:00:00 2001 From: Robin Getz Date: Tue, 21 Aug 2007 23:14:58 -0400 Subject: [PATCH] fix - ensure we don't use bootconsoles after init has been released 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 Signed-off-by: Linus Torvalds --- kernel/printk.c | 10 ++++++---- 1 file changed, 6 insertions(+), 4 deletions(-) diff --git a/kernel/printk.c b/kernel/printk.c index 5c7c325b29cc..8451dfc31d25 100644 --- a/kernel/printk.c +++ b/kernel/printk.c @@ -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; } -- 2.20.1