linux-kernel - [PATCH] virt/lib avoids oops by adding parameter checking

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Date:   Tue, 22 Aug 2017 09:07:53 +0800
From:   nixiaoming <nixiaoming@...wei.com>
To:     <alex.williamson@...hat.com>, <pbonzini@...hat.com>
CC:     <kvm@...r.kernel.org>, <linux-api@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: [PATCH] virt/lib avoids oops by adding parameter checking

The error parameter passed through the external interface
causes the system oops. So it is necessary to increase the
parameter check for all EXPORT_SYMBOL_GPL

example:
 int irq_bypass_register_producer(struct irq_bypass_producer *producer)
 {
 	if (!producer->token) /* oops if producer == null */
 		return -einval;
 }
 EXPORT_SYMBOL_GPL(irq_bypass_register_producer);

Signed-off-by: nixiaoming <nixiaoming@...wei.com>
---
 virt/lib/irqbypass.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/virt/lib/irqbypass.c b/virt/lib/irqbypass.c
index 6d2fcd6..2bb99e8 100644
--- a/virt/lib/irqbypass.c
+++ b/virt/lib/irqbypass.c
@@ -89,7 +89,7 @@ int irq_bypass_register_producer(struct irq_bypass_producer *producer)
 	struct irq_bypass_producer *tmp;
 	struct irq_bypass_consumer *consumer;
 
-	if (!producer->token)
+	if (!producer || !producer->token)
 		return -EINVAL;
 
 	might_sleep();
@@ -139,7 +139,7 @@ void irq_bypass_unregister_producer(struct irq_bypass_producer *producer)
 	struct irq_bypass_producer *tmp;
 	struct irq_bypass_consumer *consumer;
 
-	if (!producer->token)
+	if (!producer || !producer->token)
 		return;
 
 	might_sleep();
@@ -183,7 +183,7 @@ int irq_bypass_register_consumer(struct irq_bypass_consumer *consumer)
 	struct irq_bypass_consumer *tmp;
 	struct irq_bypass_producer *producer;
 
-	if (!consumer->token ||
+	if (!consumer || !consumer->token ||
 	    !consumer->add_producer || !consumer->del_producer)
 		return -EINVAL;
 
@@ -234,7 +234,7 @@ void irq_bypass_unregister_consumer(struct irq_bypass_consumer *consumer)
 	struct irq_bypass_consumer *tmp;
 	struct irq_bypass_producer *producer;
 
-	if (!consumer->token)
+	if (!consumer || !consumer->token)
 		return;
 
 	might_sleep();
-- 
2.11.0.1