lib/crypto: md5: Add at_least decoration to fixed-size array params

Add the at_least (i.e. 'static') decoration to the fixed-size array
parameters of the md5 library functions.  This causes clang to warn when
a too-small array of known size is passed.

Acked-by: Ard Biesheuvel <ardb@kernel.org>
Acked-by: "Jason A. Donenfeld" <Jason@zx2c4.com>
Link: https://lore.kernel.org/r/20251122194206.31822-4-ebiggers@kernel.org
Signed-off-by: Eric Biggers <ebiggers@kernel.org>

diff --git a/include/crypto/md5.h b/include/crypto/md5.h
index c9aa5c3abc5324e0a0834f832093eed3ffba662d..c47aedfe67ecd0e0c20f48e598540c4a42451ec6 100644 (file)
--- a/include/crypto/md5.h
+++ b/include/crypto/md5.h
@@ -76,7 +76,7 @@ void md5_update(struct md5_ctx *ctx, const u8 *data, size_t len);
  *
  * Context: Any context.
  */
-void md5_final(struct md5_ctx *ctx, u8 out[MD5_DIGEST_SIZE]);
+void md5_final(struct md5_ctx *ctx, u8 out[at_least MD5_DIGEST_SIZE]);
 
 /**
  * md5() - Compute MD5 message digest in one shot
@@ -86,7 +86,7 @@ void md5_final(struct md5_ctx *ctx, u8 out[MD5_DIGEST_SIZE]);
  *
  * Context: Any context.
  */
-void md5(const u8 *data, size_t len, u8 out[MD5_DIGEST_SIZE]);
+void md5(const u8 *data, size_t len, u8 out[at_least MD5_DIGEST_SIZE]);
 
 /**
  * struct hmac_md5_key - Prepared key for HMAC-MD5
@@ -173,7 +173,7 @@ static inline void hmac_md5_update(struct hmac_md5_ctx *ctx,
  *
  * Context: Any context.
  */
-void hmac_md5_final(struct hmac_md5_ctx *ctx, u8 out[MD5_DIGEST_SIZE]);
+void hmac_md5_final(struct hmac_md5_ctx *ctx, u8 out[at_least MD5_DIGEST_SIZE]);
 
 /**
  * hmac_md5() - Compute HMAC-MD5 in one shot, using a prepared key
@@ -187,7 +187,8 @@ void hmac_md5_final(struct hmac_md5_ctx *ctx, u8 out[MD5_DIGEST_SIZE]);
  * Context: Any context.
  */
 void hmac_md5(const struct hmac_md5_key *key,
-             const u8 *data, size_t data_len, u8 out[MD5_DIGEST_SIZE]);
+             const u8 *data, size_t data_len,
+             u8 out[at_least MD5_DIGEST_SIZE]);
 
 /**
  * hmac_md5_usingrawkey() - Compute HMAC-MD5 in one shot, using a raw key
@@ -204,6 +205,6 @@ void hmac_md5(const struct hmac_md5_key *key,
  */
 void hmac_md5_usingrawkey(const u8 *raw_key, size_t raw_key_len,
                          const u8 *data, size_t data_len,
-                         u8 out[MD5_DIGEST_SIZE]);
+                         u8 out[at_least MD5_DIGEST_SIZE]);
 
 #endif /* _CRYPTO_MD5_H */