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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>
This commit is contained in:
Julia Lawall 2010-03-28 23:39:22 +00:00 committed by Benjamin Herrenschmidt
parent 637a99022f
commit ab30f78c0a
1 changed files with 3 additions and 6 deletions
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9
drivers/macintosh/windfarm_pm91.c
View File

@ -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;
}