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[PATCH] Fix crash in unregister_console() 

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...

(akpm: It'd be better to make register_console() return something and fix the
callers.  All 106 of them...)

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Benjamin Herrenschmidt 2005-11-23 13:37:44 -08:00 committed by Linus Torvalds
parent 962b564cf1
commit e9b15b54d3
1 changed files with 1 additions and 1 deletions
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2
kernel/printk.c
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@ -956,7 +956,7 @@ int unregister_console(struct console *console)
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) {