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authorRobin Getz <rgetz@blackfin.uclinux.org>2007-08-21 23:14:58 -0400
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-08-21 20:23:53 -0700
commitcb00e99c0abd844b884c64c6b54aa3b7d345ebb1 (patch)
treef258d30a49f864abdf836b5b2be4ebb43d542e96 /kernel/printk.c
parent15f6ddc7d9cf96f2ee88897c7164198ed6e45a77 (diff)
downloadlinux-cb00e99c0abd844b884c64c6b54aa3b7d345ebb1.tar.bz2
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 <rgetz@blackfin.uclinux.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'kernel/printk.c')
-rw-r--r--kernel/printk.c10
1 files 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;
}