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crypto: api - Fix zeroing on free

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Geert Uytterhoeven pointed out that we're not zeroing all the
memory when freeing a transform.  This patch fixes it by calling
ksize to ensure that we zero everything in sight.

Reported-by: Geert Uytterhoeven <Geert.Uytterhoeven@sonycom.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Herbert Xu 2009-02-05 16:48:24 +11:00
parent 4abfd73e34
commit 7b2cd92adc
2 changed files with 16 additions and 11 deletions
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18
crypto/api.c
View file

@ -559,32 +559,32 @@ err:
EXPORT_SYMBOL_GPL(crypto_alloc_tfm);
/*
* crypto_free_tfm - Free crypto transform
* crypto_destroy_tfm - Free crypto transform
* @mem: Start of tfm slab
* @tfm: Transform to free
*
* crypto_free_tfm() frees up the transform and any associated resources,
* This function frees up the transform and any associated resources,
* then drops the refcount on the associated algorithm.
*/
void crypto_free_tfm(struct crypto_tfm *tfm)
void crypto_destroy_tfm(void *mem, struct crypto_tfm *tfm)
{
struct crypto_alg *alg;
int size;
if (unlikely(!tfm))
if (unlikely(!mem))
return;
alg = tfm->__crt_alg;
size = sizeof(*tfm) + alg->cra_ctxsize;
size = ksize(mem);
if (!tfm->exit && alg->cra_exit)
alg->cra_exit(tfm);
crypto_exit_ops(tfm);
crypto_mod_put(alg);
memset(tfm, 0, size);
kfree(tfm);
memset(mem, 0, size);
kfree(mem);
}
EXPORT_SYMBOL_GPL(crypto_free_tfm);
EXPORT_SYMBOL_GPL(crypto_destroy_tfm);
int crypto_has_alg(const char *name, u32 type, u32 mask)
{

7
include/linux/crypto.h
View file

@ -552,7 +552,12 @@ struct crypto_tfm *crypto_alloc_tfm(const char *alg_name,
const struct crypto_type *frontend,
u32 type, u32 mask);
struct crypto_tfm *crypto_alloc_base(const char *alg_name, u32 type, u32 mask);
void crypto_free_tfm(struct crypto_tfm *tfm);
void crypto_destroy_tfm(void *mem, struct crypto_tfm *tfm);
static inline void crypto_free_tfm(struct crypto_tfm *tfm)
{
return crypto_destroy_tfm(tfm, tfm);
}
int alg_test(const char *driver, const char *alg, u32 type, u32 mask);