[PATCH 11/15] smb: client: Drop 'allocate_crypto' arg from smb*_calc_signature()

[Steve French]

Acked-by: Steve French <stfrench at microsoft.com>

On Wed, Feb 18, 2026 at 3:38 PM Eric Biggers <ebiggers at kernel.org> wrote:
>
> Since the crypto library API is now being used instead of crypto_shash,
> all structs for MAC computation are now just fixed-size structs
> allocated on the stack; no dynamic allocations are ever required.
> Besides being much more efficient, this also means that the
> 'allocate_crypto' argument to smb2_calc_signature() and
> smb3_calc_signature() is no longer used.  Remove this unused argument.
>
> Signed-off-by: Eric Biggers <ebiggers at kernel.org>
> ---
>  fs/smb/client/smb2transport.c | 12 +++++-------
>  1 file changed, 5 insertions(+), 7 deletions(-)
>
> diff --git a/fs/smb/client/smb2transport.c b/fs/smb/client/smb2transport.c
> index 0176185a1efc..41009039b4cb 100644
> --- a/fs/smb/client/smb2transport.c
> +++ b/fs/smb/client/smb2transport.c
> @@ -202,12 +202,11 @@ smb2_find_smb_tcon(struct TCP_Server_Info *server, __u64 ses_id, __u32  tid)
>
>         return tcon;
>  }
>
>  static int
> -smb2_calc_signature(struct smb_rqst *rqst, struct TCP_Server_Info *server,
> -                   bool allocate_crypto)
> +smb2_calc_signature(struct smb_rqst *rqst, struct TCP_Server_Info *server)
>  {
>         int rc;
>         unsigned char smb2_signature[SMB2_HMACSHA256_SIZE];
>         struct kvec *iov = rqst->rq_iov;
>         struct smb2_hdr *shdr = (struct smb2_hdr *)iov[0].iov_base;
> @@ -438,12 +437,11 @@ generate_smb311signingkey(struct cifs_ses *ses,
>
>         return generate_smb3signingkey(ses, server, &triplet);
>  }
>
>  static int
> -smb3_calc_signature(struct smb_rqst *rqst, struct TCP_Server_Info *server,
> -                   bool allocate_crypto)
> +smb3_calc_signature(struct smb_rqst *rqst, struct TCP_Server_Info *server)
>  {
>         int rc;
>         unsigned char smb3_signature[SMB2_CMACAES_SIZE];
>         struct kvec *iov = rqst->rq_iov;
>         struct smb2_hdr *shdr = (struct smb2_hdr *)iov[0].iov_base;
> @@ -451,11 +449,11 @@ smb3_calc_signature(struct smb_rqst *rqst, struct TCP_Server_Info *server,
>         struct aes_cmac_ctx cmac_ctx;
>         struct smb_rqst drqst;
>         u8 key[SMB3_SIGN_KEY_SIZE];
>
>         if (server->vals->protocol_id <= SMB21_PROT_ID)
> -               return smb2_calc_signature(rqst, server, allocate_crypto);
> +               return smb2_calc_signature(rqst, server);
>
>         rc = smb3_get_sign_key(le64_to_cpu(shdr->SessionId), server, key);
>         if (unlikely(rc)) {
>                 cifs_server_dbg(FYI, "%s: Could not get signing key\n", __func__);
>                 return rc;
> @@ -522,11 +520,11 @@ smb2_sign_rqst(struct smb_rqst *rqst, struct TCP_Server_Info *server)
>         if (!is_binding && !server->session_estab) {
>                 strscpy(shdr->Signature, "BSRSPYL");
>                 return 0;
>         }
>
> -       return smb3_calc_signature(rqst, server, false);
> +       return smb3_calc_signature(rqst, server);
>  }
>
>  int
>  smb2_verify_signature(struct smb_rqst *rqst, struct TCP_Server_Info *server)
>  {
> @@ -558,11 +556,11 @@ smb2_verify_signature(struct smb_rqst *rqst, struct TCP_Server_Info *server)
>          */
>         memcpy(server_response_sig, shdr->Signature, SMB2_SIGNATURE_SIZE);
>
>         memset(shdr->Signature, 0, SMB2_SIGNATURE_SIZE);
>
> -       rc = smb3_calc_signature(rqst, server, true);
> +       rc = smb3_calc_signature(rqst, server);
>
>         if (rc)
>                 return rc;
>
>         if (crypto_memneq(server_response_sig, shdr->Signature,
> --
> 2.53.0
>
>


-- 
Thanks,

Steve