Hi Gilad,
On Thu, May 11, 2017 at 02:53:43PM +0300, Gilad Ben-Yossef wrote:
> drbg_kcapi_sym_ctr() was using wait_for_completion_interruptible() to
> wait for completion of async crypto op but if a signal occurs it
> may return before DMA ops of HW crypto provider finish, thus
> corrupting the output buffer.
>
> Resolve this by using wait_for_completion() instead.
>
> Reported-by: Eric Biggers <ebiggers3@xxxxxxxxx>
> Signed-off-by: Gilad Ben-Yossef <gilad@xxxxxxxxxxxxx>
> CC: stable@xxxxxxxxxxxxxxx
> ---
> crypto/drbg.c | 3 +--
> 1 file changed, 1 insertion(+), 2 deletions(-)
>
> diff --git a/crypto/drbg.c b/crypto/drbg.c
> index fa749f4..fa9054d 100644
> --- a/crypto/drbg.c
> +++ b/crypto/drbg.c
> @@ -1767,8 +1767,7 @@ static int drbg_kcapi_sym_ctr(struct drbg_state *drbg,
> break;
> case -EINPROGRESS:
> case -EBUSY:
> - ret = wait_for_completion_interruptible(
> - &drbg->ctr_completion);
> + ret = wait_for_completion(&drbg->ctr_completion);
> if (!ret && !drbg->ctr_async_err) {
> reinit_completion(&drbg->ctr_completion);
> break;
> --
wait_for_completion() doesn't return a value. This was fixed in the next patch,
but it should be done in this patch.
Eric
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