linux-kernel - [Patch](Resend) mm/sparse.c: Improve the error handling for sparse_add_one

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Date:	Tue, 27 Nov 2007 10:26:10 +0800
From:	WANG Cong <xiyou.wangcong@...il.com>
To:	Yasunori Goto <y-goto@...fujitsu.com>
Cc:	WANG Cong <xiyou.wangcong@...il.com>,
	Dave Hansen <haveblue@...ibm.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Rik van Riel <riel@...hat.com>,
	Christoph Lameter <clameter@....com>,
	Andrew Morton <akpm@...l.org>, linux-mm@...ck.org
Subject: [Patch](Resend) mm/sparse.c: Improve the error handling for
	sparse_add_one_section()

On Mon, Nov 26, 2007 at 07:19:49PM +0900, Yasunori Goto wrote:
>Hi, Cong-san.
>
>>  	ms->section_mem_map |= SECTION_MARKED_PRESENT;
>>  
>>  	ret = sparse_init_one_section(ms, section_nr, memmap, usemap);
>>  
>>  out:
>>  	pgdat_resize_unlock(pgdat, &flags);
>> -	if (ret <= 0)
>> -		__kfree_section_memmap(memmap, nr_pages);
>> +
>>  	return ret;
>>  }
>>  #endif
>
>Hmm. When sparse_init_one_section() returns error, memmap and 
>usemap should be free.

Hi, Yasunori.

Thanks for your comments. Is the following one fine for you?

Signed-off-by: WANG Cong <xiyou.wangcong@...il.com>

---

Index: linux-2.6/mm/sparse.c
===================================================================
--- linux-2.6.orig/mm/sparse.c
+++ linux-2.6/mm/sparse.c
@@ -391,9 +391,17 @@ int sparse_add_one_section(struct zone *
 	 * no locking for this, because it does its own
 	 * plus, it does a kmalloc
 	 */
-	sparse_index_init(section_nr, pgdat->node_id);
+	ret = sparse_index_init(section_nr, pgdat->node_id);
+	if (ret < 0)
+		return ret;
 	memmap = kmalloc_section_memmap(section_nr, pgdat->node_id, nr_pages);
+	if (!memmap)
+		return -ENOMEM;
 	usemap = __kmalloc_section_usemap();
+	if (!usemap) {
+		__kfree_section_memmap(memmap, nr_pages);
+		return -ENOMEM;
+	}
 
 	pgdat_resize_lock(pgdat, &flags);
 
@@ -403,10 +411,6 @@ int sparse_add_one_section(struct zone *
 		goto out;
 	}
 
-	if (!usemap) {
-		ret = -ENOMEM;
-		goto out;
-	}
 	ms->section_mem_map |= SECTION_MARKED_PRESENT;
 
 	ret = sparse_init_one_section(ms, section_nr, memmap, usemap);
@@ -414,7 +418,7 @@ int sparse_add_one_section(struct zone *
 out:
 	pgdat_resize_unlock(pgdat, &flags);
 	if (ret <= 0)
-		__kfree_section_memmap(memmap, nr_pages);
+		kfree(usemap);
 	return ret;
 }
 #endif

-
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