From: Herbert Xu <herbert@gondor.apana.org.au>
Date: Sun, 4 May 2025 13:33:23 +0000 (+0800)
Subject: crypto: ahash - Add HASH_REQUEST_ZERO
X-Git-Tag: v6.16-rc1~206^2~68
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=88bca957e87e9a8a274213db257a744170b7248a;p=thirdparty%2Flinux.git

crypto: ahash - Add HASH_REQUEST_ZERO

Add a helper to zero hash stack requests that were never cloned
off the stack.

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

diff --git a/include/crypto/internal/hash.h b/include/crypto/internal/hash.h
index e911f32f46dcd..f2bbdb74e11a9 100644
--- a/include/crypto/internal/hash.h
+++ b/include/crypto/internal/hash.h
@@ -301,5 +301,9 @@ static inline unsigned int crypto_shash_coresize(struct crypto_shash *tfm)
 	return crypto_shash_statesize(tfm) - crypto_shash_blocksize(tfm) - 1;
 }
 
+/* This can only be used if the request was never cloned. */
+#define HASH_REQUEST_ZERO(name) \
+	memzero_explicit(__##name##_req, sizeof(__##name##_req))
+
 #endif	/* _CRYPTO_INTERNAL_HASH_H */