[PATCH v2 1/2] crypto: using size_add() for kmalloc()

[Su Hui]

It's safer to use size_add() to replace open-coded aithmetic in allocator
arguments, because size_add() can prevent possible overflow problem.

Signed-off-by: Su Hui <su...@nfschina.com>
---
 include/crypto/aead.h     | 2 +-
 include/crypto/akcipher.h | 3 ++-
 include/crypto/kpp.h      | 2 +-
 3 files changed, 4 insertions(+), 3 deletions(-)

diff --git a/include/crypto/aead.h b/include/crypto/aead.h
index 0e8a41638678..8df3d112bf6a 100644
--- a/include/crypto/aead.h
+++ b/include/crypto/aead.h
@@ -433,7 +433,7 @@ static inline struct aead_request 
*aead_request_alloc(struct crypto_aead *tfm,
 {
        struct aead_request *req;
 
-       req = kmalloc(sizeof(*req) + crypto_aead_reqsize(tfm), gfp);
+       req = kmalloc(size_add(sizeof(*req), crypto_aead_reqsize(tfm)), gfp);
 
        if (likely(req))
                aead_request_set_tfm(req, tfm);
diff --git a/include/crypto/akcipher.h b/include/crypto/akcipher.h
index cdf7da74bf2f..6927664bc3d7 100644
--- a/include/crypto/akcipher.h
+++ b/include/crypto/akcipher.h
@@ -184,7 +184,8 @@ static inline struct akcipher_request 
*akcipher_request_alloc(
 {
        struct akcipher_request *req;
 
-       req = kmalloc(sizeof(*req) + crypto_akcipher_reqsize(tfm), gfp);
+       req = kmalloc(size_add(sizeof(*req),
+                              crypto_akcipher_reqsize(tfm)), gfp);
        if (likely(req))
                akcipher_request_set_tfm(req, tfm);
 
diff --git a/include/crypto/kpp.h b/include/crypto/kpp.h
index 2d9c4de57b69..ad120bbc8b7c 100644
--- a/include/crypto/kpp.h
+++ b/include/crypto/kpp.h
@@ -182,7 +182,7 @@ static inline struct kpp_request *kpp_request_alloc(struct 
crypto_kpp *tfm,
 {
        struct kpp_request *req;
 
-       req = kmalloc(sizeof(*req) + crypto_kpp_reqsize(tfm), gfp);
+       req = kmalloc(size_add(sizeof(*req), crypto_kpp_reqsize(tfm)), gfp);
        if (likely(req))
                kpp_request_set_tfm(req, tfm);
 
-- 
2.30.2