crypto: null - Remove VLA usage of skcipher

In the quest to remove all stack VLA usage from the kernel[1], this
replaces struct crypto_skcipher and SKCIPHER_REQUEST_ON_STACK() usage
with struct crypto_sync_skcipher and SYNC_SKCIPHER_REQUEST_ON_STACK(),
which uses a fixed stack size.

[1] https://lkml.kernel.org/r/CA+55aFzCG-zNmZwX4A2FQpadafLfEzK6CC=qPXydAacU1RqZWA@mail.gmail.com

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

2 files changed, 2 insertions, 2 deletions

diff --git a/include/crypto/internal/geniv.h b/include/crypto/internal/geniv.h
index 2bcfb931bc5b..71be24cd59bd 100644
--- a/include/crypto/internal/geniv.h
+++ b/include/crypto/internal/geniv.h
@@ -20,7 +20,7 @@
 struct aead_geniv_ctx {
         spinlock_t lock;
         struct crypto_aead *child;
-        struct crypto_skcipher *sknull;
+        struct crypto_sync_skcipher *sknull;
         u8 salt[] __attribute__ ((aligned(__alignof__(u32))));
 };
 
diff --git a/include/crypto/null.h b/include/crypto/null.h
index 15aeef6e30ef..0ef577cc00e3 100644
--- a/include/crypto/null.h
+++ b/include/crypto/null.h
@@ -9,7 +9,7 @@
 #define NULL_DIGEST_SIZE        0
 #define NULL_IV_SIZE            0
 
-struct crypto_skcipher *crypto_get_default_null_skcipher(void);
+struct crypto_sync_skcipher *crypto_get_default_null_skcipher(void);
 void crypto_put_default_null_skcipher(void);
 
 #endif