linux-kernel - [PATCH] percpu: Fix memory leak from percpu_init

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Message-ID: <20100819144956.27058.69126.stgit@e102109-lin.cambridge.arm.com>
Date:	Thu, 19 Aug 2010 15:49:56 +0100
From:	Catalin Marinas <catalin.marinas@....com>
To:	linux-kernel@...r.kernel.org
Cc:	Tejun Heo <tj@...nel.org>
Subject: [PATCH] percpu: Fix memory leak from percpu_init_late()

The chunk->map memory block allocated in percpu_init_late() (as of
commit 099a19d9) is later overridden in pcpu_extend_area_map(). The
patch frees this existing block in the latter function. Found by
kmemleak.

Signed-off-by: Catalin Marinas <catalin.marinas@....com>
Cc: Tejun Heo <tj@...nel.org>
---
 mm/percpu.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/mm/percpu.c b/mm/percpu.c
index e61dc2c..c0d3329 100644
--- a/mm/percpu.c
+++ b/mm/percpu.c
@@ -394,6 +394,7 @@ static int pcpu_extend_area_map(struct pcpu_chunk *chunk, int new_alloc)
 
 	old_size = chunk->map_alloc * sizeof(chunk->map[0]);
 	memcpy(new, chunk->map, old_size);
+	pcpu_mem_free(chunk->map, old_size);
 
 	chunk->map_alloc = new_alloc;
 	chunk->map = new;

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