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irqdomain: Prevent potential NULL pointer dereference in irq_domain_push_irq()

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This code generates a Smatch warning:

  kernel/irq/irqdomain.c:1511 irq_domain_push_irq()
  warn: variable dereferenced before check 'root_irq_data' (see line 1508)

irq_get_irq_data() can return a NULL pointer, but the code dereferences
the returned pointer before checking it.

Move the NULL pointer check before the dereference.

[ tglx: Rewrote changelog to be precise and conforming to the instructions
  	in submitting-patches and added a Fixes tag. Sigh! ]

Fixes: 495c38d3001f ("irqdomain: Add irq_domain_{push,pop}_irq() functions")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: David Daney <david.daney@cavium.com>
Cc: Marc Zyngier <marc.zyngier@arm.com>
Cc: kernel-janitors@vger.kernel.org
Link: http://lkml.kernel.org/r/20170825121409.6rfv4vt6ztz2oqkt@mwanda
This commit is contained in:
Dan Carpenter 2017-08-25 15:14:09 +03:00 committed by Thomas Gleixner
parent ce8bdd6957
commit 20c4d49c0f
1 changed files with 2 additions and 2 deletions
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4
kernel/irq/irqdomain.c
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@ -1504,10 +1504,10 @@ int irq_domain_push_irq(struct irq_domain *domain, int virq, void *arg)
if (WARN_ON(!irq_domain_is_hierarchy(domain)))
return -EINVAL;
if (domain->parent != root_irq_data->domain)
if (!root_irq_data)
return -EINVAL;
if (!root_irq_data)
if (domain->parent != root_irq_data->domain)
return -EINVAL;
child_irq_data = kzalloc_node(sizeof(*child_irq_data), GFP_KERNEL,