From d2d9433a4c84c9e7ed78d633fdbffb35d5afda17 Mon Sep 17 00:00:00 2001 From: Dmitry Adamushko Date: Tue, 8 May 2007 00:27:31 -0700 Subject: [PATCH] kernel/irq/proc.c: unprotected iteration over the IRQ action list in name_unique() setup_irq() releases a desc->lock before calling register_handler_proc(), so the iteration over the IRQ action list is not protected. (akpm: the check itself is still racy, but at least it probably won't oops now). Cc: Ingo Molnar Cc: Thomas Gleixner Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- kernel/irq/proc.c | 15 +++++++++++---- 1 file changed, 11 insertions(+), 4 deletions(-) diff --git a/kernel/irq/proc.c b/kernel/irq/proc.c index 2db91eb54ad..ddde0ef9ccd 100644 --- a/kernel/irq/proc.c +++ b/kernel/irq/proc.c @@ -66,12 +66,19 @@ static int name_unique(unsigned int irq, struct irqaction *new_action) { struct irq_desc *desc = irq_desc + irq; struct irqaction *action; + unsigned long flags; + int ret = 1; - for (action = desc->action ; action; action = action->next) + spin_lock_irqsave(&desc->lock, flags); + for (action = desc->action ; action; action = action->next) { if ((action != new_action) && action->name && - !strcmp(new_action->name, action->name)) - return 0; - return 1; + !strcmp(new_action->name, action->name)) { + ret = 0; + break; + } + } + spin_unlock_irqrestore(&desc->lock, flags); + return ret; } void register_handler_proc(unsigned int irq, struct irqaction *action) -- 2.20.1