From ab30f78c0afbb86584144925e25c7ca68ba9a91f Mon Sep 17 00:00:00 2001
From: Julia Lawall <julia@diku.dk>
Date: Sun, 28 Mar 2010 23:39:22 +0000
Subject: [PATCH] powerpc/pmac/windfarm: Correct potential double free
The conditionals were testing different values, but then all freeing the
same one, which could result in a double free.
A simplified version of the semantic match that finds this problem is as
follows: (http://coccinelle.lip6.fr/)
// <smpl>
@@
expression x,e;
identifier f;
iterator I;
statement S;
@@
*kfree(x);
... when != &x
when != x = e
when != I(x,...) S
*x
// </smpl>
Signed-off-by: Julia Lawall <julia@diku.dk>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
---
drivers/macintosh/windfarm_pm91.c | 9 +++------
1 file changed, 3 insertions(+), 6 deletions(-)
diff --git a/drivers/macintosh/windfarm_pm91.c b/drivers/macintosh/windfarm_pm91.c
index bea99168ff35..344273235124 100644
--- a/drivers/macintosh/windfarm_pm91.c
+++ b/drivers/macintosh/windfarm_pm91.c
@@ -687,12 +687,9 @@ static int __devexit wf_smu_remove(struct platform_device *ddev)
wf_put_control(cpufreq_clamp);
/* Destroy control loops state structures */
- if (wf_smu_slots_fans)
- kfree(wf_smu_cpu_fans);
- if (wf_smu_drive_fans)
- kfree(wf_smu_cpu_fans);
- if (wf_smu_cpu_fans)
- kfree(wf_smu_cpu_fans);
+ kfree(wf_smu_slots_fans);
+ kfree(wf_smu_drive_fans);
+ kfree(wf_smu_cpu_fans);
return 0;
}
--
GitLab