Re: [PATCH 3/7] crypto: testmgr: fix warning

[Jarod Wilson]

On 10/19/09 9:52 AM, Jiri Kosina wrote:
> On Mon, 19 Oct 2009, Felipe Contreras wrote:
>
> > crypto/testmgr.c: In function ?test_cprng?:
> > crypto/testmgr.c:1204: warning: ?err? may be used uninitialized in this function
> >
> > Signed-off-by: Felipe Contreras<felipe.contreras@xxxxxxxxx>
> > ---
> >   crypto/testmgr.c |    2 +-
> >   1 files changed, 1 insertions(+), 1 deletions(-)
> >
> > diff --git a/crypto/testmgr.c b/crypto/testmgr.c
> > index 6d5b746..1f2357b 100644
> > --- a/crypto/testmgr.c
> > +++ b/crypto/testmgr.c
> > @@ -1201,7 +1201,7 @@ static int test_cprng(struct crypto_rng *tfm, struct cprng_testvec *template,
> >   		      unsigned int tcount)
> >   {
> >   	const char *algo = crypto_tfm_alg_driver_name(crypto_rng_tfm(tfm));
> > -	int err, i, j, seedsize;
> > +	int err = 0, i, j, seedsize;
> >   	u8 *seed;
> >   	char result[32];
>
> As it is not obvious to me immediately why/whether tcount couldn't be zero
> (which would cause uninitialized use of 'err'), I am not merging this
> through trivial tree. Herbert?

I believe I'm the guilty party who wrote the code in question. 
Initializing err to 0 isn't correct. tcount should always be at least 1, 
if its 0, test_cprng has been called with invalid parameters. I believe 
err would best be initialized to -EINVAL, lest the caller think they 
were successful.

--
Jarod Wilson
jarod@xxxxxxxxxx
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