[CRYPTO] api: Sanitise mask when allocating ablkcipher/hash

When allocating ablkcipher/hash objects, we use a mask that's wider than
the usual type mask.  This patch sanitises the mask supplied by the user
so we don't end up using a narrower mask which may lead to unintended
results.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

1 files changed, 4 insertions, 0 deletions

diff --git a/include/linux/crypto.h b/include/linux/crypto.h
index 48aa5959ab..ef7642ed3e 100644
--- a/include/linux/crypto.h
+++ b/include/linux/crypto.h
@@ -532,6 +532,7 @@ static inline struct crypto_ablkcipher *crypto_alloc_ablkcipher(
         const char *alg_name, u32 type, u32 mask)
 {
         type &= ~CRYPTO_ALG_TYPE_MASK;
+        mask &= ~CRYPTO_ALG_TYPE_MASK;
         type |= CRYPTO_ALG_TYPE_BLKCIPHER;
         mask |= CRYPTO_ALG_TYPE_BLKCIPHER_MASK;
 
@@ -554,6 +555,7 @@ static inline int crypto_has_ablkcipher(const char *alg_name, u32 type,
                                         u32 mask)
 {
         type &= ~CRYPTO_ALG_TYPE_MASK;
+        mask &= ~CRYPTO_ALG_TYPE_MASK;
         type |= CRYPTO_ALG_TYPE_BLKCIPHER;
         mask |= CRYPTO_ALG_TYPE_BLKCIPHER_MASK;
 
@@ -1086,6 +1088,7 @@ static inline struct crypto_hash *crypto_alloc_hash(const char *alg_name,
                                                     u32 type, u32 mask)
 {
         type &= ~CRYPTO_ALG_TYPE_MASK;
+        mask &= ~CRYPTO_ALG_TYPE_MASK;
         type |= CRYPTO_ALG_TYPE_HASH;
         mask |= CRYPTO_ALG_TYPE_HASH_MASK;
 
@@ -1105,6 +1108,7 @@ static inline void crypto_free_hash(struct crypto_hash *tfm)
 static inline int crypto_has_hash(const char *alg_name, u32 type, u32 mask)
 {
         type &= ~CRYPTO_ALG_TYPE_MASK;
+        mask &= ~CRYPTO_ALG_TYPE_MASK;
         type |= CRYPTO_ALG_TYPE_HASH;
         mask |= CRYPTO_ALG_TYPE_HASH_MASK;