If unregister_console() is inadvertently called while no consoles are
registered, it will crash trying to dereference NULL pointer. It is
necessary to fix that because register_console() provides no indication
that it actually registered the console passed in. In fact, it may well
decide not to register it based on various things...
Signed-off-by: Benjamin Herrenschmidt <[email protected]>
Index: linux-serialfix/kernel/printk.c
===================================================================
--- linux-serialfix.orig/kernel/printk.c 2005-11-15 11:54:14.000000000 +1100
+++ linux-serialfix/kernel/printk.c 2005-11-23 17:47:11.000000000 +1100
@@ -956,7 +956,7 @@ int unregister_console(struct console *c
if (console_drivers == console) {
console_drivers=console->next;
res = 0;
- } else {
+ } else if (console_drivers) {
for (a=console_drivers->next, b=console_drivers ;
a; b=a, a=b->next) {
if (a == console) {
-
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