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

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Message-ID: <tip-72364d320644c12948786962673772f271039a4a@git.kernel.org>
Date:   Thu, 28 Sep 2017 03:21:46 -0700
From:   tip-bot for Jeffy Chen <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     mingo@...nel.org, linux-kernel@...r.kernel.org,
        jeffy.chen@...k-chips.com, hpa@...or.com, tglx@...utronix.de
Subject: [tip:irq/urgent] irq/generic-chip: Don't replace domain's name

Commit-ID:  72364d320644c12948786962673772f271039a4a
Gitweb:     https://git.kernel.org/tip/72364d320644c12948786962673772f271039a4a
Author:     Jeffy Chen <jeffy.chen@...k-chips.com>
AuthorDate: Thu, 28 Sep 2017 12:37:31 +0800
Committer:  Thomas Gleixner <tglx@...utronix.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@...k-chips.com>
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Cc: stable@...r.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);