linux-kernel - [PATCH -next] irqdomain: fix overflow error

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Message-ID: <20210908014623.61357-1-cuibixuan@huawei.com>
Date:   Wed, 8 Sep 2021 09:46:23 +0800
From:   Bixuan Cui <cuibixuan@...wei.com>
To:     <linux-kernel@...r.kernel.org>
CC:     <maz@...nel.org>, <tglx@...utronix.de>, <john.wanghui@...wei.com>
Subject: [PATCH -next] irqdomain: fix overflow error

In function ‘kmalloc_node’,
    inlined from ‘kzalloc_node.constprop’ at ./include/linux/slab.h:743:9,
    inlined from ‘__irq_domain_add’ at kernel/irq/irqdomain.c:153:9:
./include/linux/slab.h:618:9: error: argument 1 value ‘18446744073709551615’ exceeds maximum object size 9223372036854775807 [-Werror=alloc-size-larger-than=]
  return __kmalloc_node(size, flags, node);

The 'size' can be negative here, which will then get turned into a giant
size argument for kzalloc_node(). Changing the size to 'unsigned int'
instead seems more appropriate.

Signed-off-by: Bixuan Cui <cuibixuan@...wei.com>
---
 include/linux/irqdomain.h | 2 +-
 kernel/irq/irqdomain.c    | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/include/linux/irqdomain.h b/include/linux/irqdomain.h
index 23e4ee523576..9ee238ad29ce 100644
--- a/include/linux/irqdomain.h
+++ b/include/linux/irqdomain.h
@@ -251,7 +251,7 @@ static inline struct fwnode_handle *irq_domain_alloc_fwnode(phys_addr_t *pa)
 }
 
 void irq_domain_free_fwnode(struct fwnode_handle *fwnode);
-struct irq_domain *__irq_domain_add(struct fwnode_handle *fwnode, int size,
+struct irq_domain *__irq_domain_add(struct fwnode_handle *fwnode, unsigned int size,
 				    irq_hw_number_t hwirq_max, int direct_max,
 				    const struct irq_domain_ops *ops,
 				    void *host_data);
diff --git a/kernel/irq/irqdomain.c b/kernel/irq/irqdomain.c
index 19e83e9b723c..4d8fc65cf38f 100644
--- a/kernel/irq/irqdomain.c
+++ b/kernel/irq/irqdomain.c
@@ -136,7 +136,7 @@ EXPORT_SYMBOL_GPL(irq_domain_free_fwnode);
  * Allocates and initializes an irq_domain structure.
  * Returns pointer to IRQ domain, or NULL on failure.
  */
-struct irq_domain *__irq_domain_add(struct fwnode_handle *fwnode, int size,
+struct irq_domain *__irq_domain_add(struct fwnode_handle *fwnode, unsigned int size,
 				    irq_hw_number_t hwirq_max, int direct_max,
 				    const struct irq_domain_ops *ops,
 				    void *host_data)
-- 
2.17.1