On 11/10/10 03:21, Steffen Klassert wrote:
> On Wed, Nov 03, 2010 at 02:15:19PM -0700, Randy Dunlap wrote:
>>
>> modprobe pcrypt; rmmod pcrypt ==>
>>
>>
>> [ 76.081639] calling pcrypt_init+0x0/0x107 [pcrypt] @ 3016
>> Nov 3 13:02:15 control kernel: [ 76.089883] initcall
>> pcrypt_init+0x0/0x107 [pcrypt] returned 0 after 2476 usecs
>> [ 76.081639] calling pcrypt_i
>>
>>
>> [ 79.940445] general protection fault: 0000 [#1] SMP DEBUG_PAGEALLOC
>
> Looks like a use after free of the padata instance.
> Does the patch below fix it?
Yes, it does. Thanks.
Tested-by: Randy Dunlap <randy.dun...@oracle.com>
> Thanks for reporting,
>
> Steffen
>
>
> Subject: [PATCH] crypto: pcrypt - Fix use after free on padata_free
>
> kobject_put is called from padata_free for the padata kobject.
> The kobject's release function frees the padata instance,
> so don't call kobject_put for the padata kobject from pcrypt.
>
> Signed-off-by: Steffen Klassert <steffen.klass...@secunet.com>
> ---
> crypto/pcrypt.c | 1 -
> 1 files changed, 0 insertions(+), 1 deletions(-)
>
> diff --git a/crypto/pcrypt.c b/crypto/pcrypt.c
> index de30782..75586f1 100644
> --- a/crypto/pcrypt.c
> +++ b/crypto/pcrypt.c
> @@ -504,7 +504,6 @@ err:
>
> static void pcrypt_fini_padata(struct padata_pcrypt *pcrypt)
> {
> - kobject_put(&pcrypt->pinst->kobj);
> free_cpumask_var(pcrypt->cb_cpumask->mask);
> kfree(pcrypt->cb_cpumask);
>
--
~Randy
*** Remember to use Documentation/SubmitChecklist when testing your code ***
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