Re: [PATCH v2] crypto: chcr - Fix error handling related to 'chcr_alloc_shash'

[Herbert Xu]

On Thu, Apr 13, 2017 at 08:25:15PM +0200, Christophe JAILLET wrote:
> Up to now, 'crypto_alloc_shash()' may return a valid pointer, an error
> pointer or NULL (in case of invalid parameter)
> Update it to always return an error pointer in case of error. It now
> returns ERR_PTR(-EINVAL) instead of NULL in case of invalid parameter.
> 
> This simplifies error handling.
> 
> Also fix a crash in 'chcr_authenc_setkey()' if 'chcr_alloc_shash()'
> returns an error pointer and the "goto out" path is taken.
> 
> Signed-off-by: Christophe JAILLET 

Patch applied.  Thanks.
-- 
Email: Herbert Xu 
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt

[PATCH v2] crypto: chcr - Fix error handling related to 'chcr_alloc_shash'

[Christophe JAILLET]

Up to now, 'crypto_alloc_shash()' may return a valid pointer, an error
pointer or NULL (in case of invalid parameter)
Update it to always return an error pointer in case of error. It now
returns ERR_PTR(-EINVAL) instead of NULL in case of invalid parameter.

This simplifies error handling.

Also fix a crash in 'chcr_authenc_setkey()' if 'chcr_alloc_shash()'
returns an error pointer and the "goto out" path is taken.

Signed-off-by: Christophe JAILLET 
---
v2: Modify 'chcr_alloc_shash' to return ERR_PTR(-EINVAL) instead of NULL
in case of invalid parameter.
---
 drivers/crypto/chelsio/chcr_algo.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/crypto/chelsio/chcr_algo.c 
b/drivers/crypto/chelsio/chcr_algo.c
index 41bc7f4f58cd..1fb1ac9d70b1 100644
--- a/drivers/crypto/chelsio/chcr_algo.c
+++ b/drivers/crypto/chelsio/chcr_algo.c
@@ -294,7 +294,7 @@ static inline void get_aes_decrypt_key(unsigned char 
*dec_key,
 
 static struct crypto_shash *chcr_alloc_shash(unsigned int ds)
 {
-   struct crypto_shash *base_hash = NULL;
+   struct crypto_shash *base_hash = ERR_PTR(-EINVAL);
 
switch (ds) {
case SHA1_DIGEST_SIZE:
@@ -2259,7 +2259,7 @@ static int chcr_authenc_setkey(struct crypto_aead 
*authenc, const u8 *key,
int err = 0, i, key_ctx_len = 0;
unsigned char ck_size = 0;
unsigned char pad[CHCR_HASH_MAX_BLOCK_SIZE_128] = { 0 };
-   struct crypto_shash *base_hash = NULL;
+   struct crypto_shash *base_hash = ERR_PTR(-EINVAL);
struct algo_param param;
int align;
u8 *o_ptr = NULL;
@@ -2351,7 +2351,7 @@ static int chcr_authenc_setkey(struct crypto_aead 
*authenc, const u8 *key,
}
 out:
aeadctx->enckey_len = 0;
-   if (base_hash)
+   if (!IS_ERR(base_hash))
chcr_free_shash(base_hash);
return -EINVAL;
 }
-- 
2.11.0