[PATCH v2] irq/generic-chip: Don't replace domain's name

[PATCH v2] irq/generic-chip: Don't replace domain's name

[Jeffy Chen]

Currently we are replacing domain's name with irq chip's name when
allocating generic chips.

When the old domain's name is allocated, it would cause memory leak.
Even worse the domain framework would try to free the wrong name later.

Fixes: d59f6617eef0 ("genirq: Allow fwnode to carry name information only")
Signed-off-by: Jeffy Chen <jeffy.chen@rock-chips.com>
---

Changes in v2:
Don't replace domain's name instead of trying to free the old name.

 kernel/irq/generic-chip.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/kernel/irq/generic-chip.c b/kernel/irq/generic-chip.c
index f7086b78ad6e..5270a54b9fa4 100644
--- a/kernel/irq/generic-chip.c
+++ b/kernel/irq/generic-chip.c
@@ -322,7 +322,6 @@ int __irq_alloc_domain_generic_chips(struct irq_domain *d, int irqs_per_chip,
 		/* Calc pointer to the next generic chip */
 		tmp += sizeof(*gc) + num_ct * sizeof(struct irq_chip_type);
 	}
-	d->name = name;
 	return 0;
 }
 EXPORT_SYMBOL_GPL(__irq_alloc_domain_generic_chips);
-- 
2.11.0

[tip:irq/urgent] irq/generic-chip: Don't replace domain's name

[tip-bot for Jeffy Chen]

Commit-ID:  72364d320644c12948786962673772f271039a4a
Gitweb:     https://git.kernel.org/tip/72364d320644c12948786962673772f271039a4a
Author:     Jeffy Chen <jeffy.chen@rock-chips.com>
AuthorDate: Thu, 28 Sep 2017 12:37:31 +0800
Committer:  Thomas Gleixner <tglx@linutronix.de>
CommitDate: Thu, 28 Sep 2017 12:18:59 +0200

irq/generic-chip: Don't replace domain's name

When generic irq chips are allocated for an irq domain the domain name is
set to the irq chip name. That was done to have named domains before the
recent changes which enforce domain naming were done.

Since then the overwrite causes a memory leak when the domain name is
dynamically allocated and even worse it would cause the domain free code to
free the wrong name pointer, which might point to a constant.

Remove the name assignment to prevent this.

Fixes: d59f6617eef0 ("genirq: Allow fwnode to carry name information only")
Signed-off-by: Jeffy Chen <jeffy.chen@rock-chips.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: stable@vger.kernel.org
Link: https://lkml.kernel.org/r/20170928043731.4764-1-jeffy.chen@rock-chips.com

---
 kernel/irq/generic-chip.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/kernel/irq/generic-chip.c b/kernel/irq/generic-chip.c
index f7086b7..5270a54 100644
--- a/kernel/irq/generic-chip.c
+++ b/kernel/irq/generic-chip.c
@@ -322,7 +322,6 @@ int __irq_alloc_domain_generic_chips(struct irq_domain *d, int irqs_per_chip,
 		/* Calc pointer to the next generic chip */
 		tmp += sizeof(*gc) + num_ct * sizeof(struct irq_chip_type);
 	}
-	d->name = name;
 	return 0;
 }
 EXPORT_SYMBOL_GPL(__irq_alloc_domain_generic_chips);