linux-kernel - [tip:x86/apic] x86/hpet: Pass proper pointer to irq_alloc

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Message-ID: <tip-4a00c95dcdba45c9592af2e908c0816fd54f5544@git.kernel.org>
Date:	Wed, 13 May 2015 00:54:32 -0700
From:	tip-bot for Sergey Senozhatsky <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	sergey.senozhatsky.work@...il.com, jiang.liu@...ux.intel.com,
	mingo@...nel.org, hpa@...or.com, linux-kernel@...r.kernel.org,
	tglx@...utronix.de, sergey.senozhatsky@...il.com
Subject: [tip:x86/apic] x86/hpet: Pass proper pointer to irq_alloc_info

Commit-ID:  4a00c95dcdba45c9592af2e908c0816fd54f5544
Gitweb:     http://git.kernel.org/tip/4a00c95dcdba45c9592af2e908c0816fd54f5544
Author:     Sergey Senozhatsky <sergey.senozhatsky@...il.com>
AuthorDate: Mon, 11 May 2015 18:56:49 +0900
Committer:  Thomas Gleixner <tglx@...utronix.de>
CommitDate: Wed, 13 May 2015 09:50:24 +0200

x86/hpet: Pass proper pointer to irq_alloc_info

Fix the following oops:
 hpet_msi_get_hwirq+0x1f/0x27
 msi_domain_alloc+0x35/0xfe
 ? trace_hardirqs_on_caller+0x16c/0x188
 irq_domain_alloc_irqs_recursive+0x51/0x95
 __irq_domain_alloc_irqs+0x151/0x223
 hpet_assign_irq+0x5d/0x68
 hpet_msi_capability_lookup+0x121/0x1cb
 ? hpet_enable+0x2b4/0x2b4
 hpet_late_init+0x5f/0xf2
 ? hpet_enable+0x2b4/0x2b4
 do_one_initcall+0x184/0x199
 kernel_init_freeable+0x1af/0x237
 ? rest_init+0x13a/0x13a
 kernel_init+0xe/0xd4
 ret_from_fork+0x3f/0x70
 ? rest_init+0x13a/0x13a

Since 3cb96f0c9733 ('x86/hpet: Enhance HPET IRQ to support
hierarchical irqdomains') hpet_msi_capability_lookup() uses
hpet_assign_irq(). The latter initializes irq_alloc_info on stack, but
passes a NULL pointer to irq_domain_alloc_irqs(), which causes a NULL
pointer dereference later in hpet_msi_get_hwirq().

Pass the pointer to the irq_alloc_info irq_domain_alloc_irqs().

Fixes: 3cb96f0c9733 'x86/hpet: Enhance HPET IRQ to support hierarchical irqdomains'
Signed-off-by: Sergey Senozhatsky <sergey.senozhatsky@...il.com>
Reviewed-by: Jiang Liu <jiang.liu@...ux.intel.com>
Cc: Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>
Link: http://lkml.kernel.org/r/20150512041444.GA1094@swordfish
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
---
 arch/x86/kernel/apic/msi.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/kernel/apic/msi.c b/arch/x86/kernel/apic/msi.c
index 58fde66..ef516af 100644
--- a/arch/x86/kernel/apic/msi.c
+++ b/arch/x86/kernel/apic/msi.c
@@ -351,6 +351,6 @@ int hpet_assign_irq(struct irq_domain *domain, struct hpet_dev *dev,
 	info.hpet_id = hpet_dev_id(domain);
 	info.hpet_index = dev_num;

-	return irq_domain_alloc_irqs(domain, 1, NUMA_NO_NODE, NULL);
+	return irq_domain_alloc_irqs(domain, 1, NUMA_NO_NODE, &info);
 }
 #endif
--
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