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[CRYPTO] Add null short circuit to crypto_free_tfm

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As far as I'm aware there's a general concensus that functions that are
responsible for freeing resources should be able to cope with being passed
a NULL pointer. This makes sense as it removes the need for all callers to
check for NULL, thus elliminating the bugs that happen when some forget
(safer to just check centrally in the freeing function) and it also makes
for smaller code all over due to the lack of all those NULL checks.
This patch makes it safe to pass the crypto_free_tfm() function a NULL
pointer. Once this patch is applied we can start removing the NULL checks
from the callers.

Signed-off-by: Jesper Juhl <juhl-lkml@dif.dk>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jesper Juhl 2005-07-06 13:54:31 -07:00 committed by David S. Miller
parent 476df259cd
commit a61cc44812
1 changed files with 10 additions and 2 deletions
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12
crypto/api.c
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@ -13,6 +13,8 @@
* any later version.
*
*/
#include <linux/compiler.h>
#include <linux/init.h>
#include <linux/crypto.h>
#include <linux/errno.h>
@ -189,8 +191,14 @@ out:
void crypto_free_tfm(struct crypto_tfm *tfm)
{
struct crypto_alg *alg = tfm->__crt_alg;
int size = sizeof(*tfm) + alg->cra_ctxsize;
struct crypto_alg *alg;
int size;
if (unlikely(!tfm))
return;
alg = tfm->__crt_alg;
size = sizeof(*tfm) + alg->cra_ctxsize;
crypto_exit_ops(tfm);
crypto_alg_put(alg);