linux-kernel - [PATCH] percpu: Fix rollback in pcpu_embed_first

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Date:	Wed, 9 May 2012 14:39:48 +0200
From:	Michael Holzheu <holzheu@...ux.vnet.ibm.com>
To:	Tejun Heo <tj@...nel.org>
Cc:	linux-kernel@...r.kernel.org
Subject: [PATCH] percpu: Fix rollback in pcpu_embed_first_chunk()

From: Michael Holzheu <holzheu@...ux.vnet.ibm.com>
Subject: percpu: Fix rollback in pcpu_embed_first_chunk()

The "out_free_areas" rollback in pcpu_embed_first_chunk calls the
free_fn() function for all elements in area[]. This is not correct
because not all elements have been allocated.

To fix this we call free_fn() only for allocated elements.

Signed-off-by: Michael Holzheu <holzheu@...ux.vnet.ibm.com>
---
diff --git a/mm/percpu.c b/mm/percpu.c
index f47af91..5a7f631 100644
--- a/mm/percpu.c
+++ b/mm/percpu.c
@@ -1692,9 +1692,9 @@ int __init pcpu_embed_first_chunk(size_t reserved_size, size_t dyn_size,
 	goto out_free;
 
 out_free_areas:
-	for (group = 0; group < ai->nr_groups; group++)
-		free_fn(areas[group],
-			ai->groups[group].nr_units * ai->unit_size);
+	for (;group > 0; group--)
+		free_fn(areas[group - 1],
+			ai->groups[group - 1].nr_units * ai->unit_size);
 out_free:
 	pcpu_free_alloc_info(ai);
 	if (areas)

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