linux-kernel - [tip:x86/urgent] x86: Fix error return sequence in __ioremap

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Message-ID: <tip-3b83171ef258627a91f60419f503b9b10e25f3fe@git.kernel.org>
Date:	Sun, 8 Nov 2009 11:18:42 GMT
From:	tip-bot for Xiaotian Feng <dfeng@...hat.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...hat.com,
	venkatesh.pallipadi@...el.com, suresh.b.siddha@...el.com,
	tglx@...utronix.de, dfeng@...hat.com, mingo@...e.hu
Subject: [tip:x86/urgent] x86: Fix error return sequence in __ioremap_caller()

Commit-ID:  3b83171ef258627a91f60419f503b9b10e25f3fe
Gitweb:     http://git.kernel.org/tip/3b83171ef258627a91f60419f503b9b10e25f3fe
Author:     Xiaotian Feng <dfeng@...hat.com>
AuthorDate: Thu, 5 Nov 2009 10:43:51 +0800
Committer:  Ingo Molnar <mingo@...e.hu>
CommitDate: Sun, 8 Nov 2009 12:14:50 +0100

x86: Fix error return sequence in __ioremap_caller()

kernel missed to free memtype if get_vm_area_caller failed in
__ioremap_caller.

This patch introduces error path to fix this and cleans up the
repetitive error return sequences that contributed to the
creation of the bug.

Signed-off-by: Xiaotian Feng <dfeng@...hat.com>
Acked-by: Suresh Siddha <suresh.b.siddha@...el.com>
Cc: Venkatesh Pallipadi <venkatesh.pallipadi@...el.com>
Cc: H. Peter Anvin <hpa@...or.com>
LKML-Reference: <1257389031-20429-1-git-send-email-dfeng@...hat.com>
Signed-off-by: Ingo Molnar <mingo@...e.hu>
---
 arch/x86/mm/ioremap.c |   24 +++++++++++-------------
 1 files changed, 11 insertions(+), 13 deletions(-)

diff --git a/arch/x86/mm/ioremap.c b/arch/x86/mm/ioremap.c
index 334e63c..2feb9bd 100644
--- a/arch/x86/mm/ioremap.c
+++ b/arch/x86/mm/ioremap.c
@@ -170,8 +170,7 @@ static void __iomem *__ioremap_caller(resource_size_t phys_addr,
 				(unsigned long long)phys_addr,
 				(unsigned long long)(phys_addr + size),
 				prot_val, new_prot_val);
-			free_memtype(phys_addr, phys_addr + size);
-			return NULL;
+			goto err_free_memtype;
 		}
 		prot_val = new_prot_val;
 	}
@@ -197,26 +196,25 @@ static void __iomem *__ioremap_caller(resource_size_t phys_addr,
 	 */
 	area = get_vm_area_caller(size, VM_IOREMAP, caller);
 	if (!area)
-		return NULL;
+		goto err_free_memtype;
 	area->phys_addr = phys_addr;
 	vaddr = (unsigned long) area->addr;
 
-	if (kernel_map_sync_memtype(phys_addr, size, prot_val)) {
-		free_memtype(phys_addr, phys_addr + size);
-		free_vm_area(area);
-		return NULL;
-	}
+	if (kernel_map_sync_memtype(phys_addr, size, prot_val))
+		goto err_free_area;
 
-	if (ioremap_page_range(vaddr, vaddr + size, phys_addr, prot)) {
-		free_memtype(phys_addr, phys_addr + size);
-		free_vm_area(area);
-		return NULL;
-	}
+	if (ioremap_page_range(vaddr, vaddr + size, phys_addr, prot))
+		goto err_free_area;
 
 	ret_addr = (void __iomem *) (vaddr + offset);
 	mmiotrace_ioremap(unaligned_phys_addr, unaligned_size, ret_addr);
 
 	return ret_addr;
+err_free_area:
+	free_vm_area(area);
+err_free_memtype:
+	free_memtype(phys_addr, phys_addr + size);
+	return NULL;
 }
 
 /**
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