KEYS: trusted: fix DCP blob payload length assignment

The DCP trusted key type uses the wrong helper function to store
the blob's payload length which can lead to the wrong byte order
being used in case this would ever run on big endian architectures.

Fix by using correct helper function.

Cc: [email protected] # v6.10+
Fixes: 2e8a0f4 ("KEYS: trusted: Introduce NXP DCP-backed trusted keys")
Suggested-by: Richard Weinberger <[email protected]>
Reported-by: kernel test robot <[email protected]>
Closes: https://lore.kernel.org/oe-kbuild-all/[email protected]/
Signed-off-by: David Gstir <[email protected]>
Reviewed-by: Jarkko Sakkinen <[email protected]>
Signed-off-by: Jarkko Sakkinen <[email protected]>

Author: iokill

security/keys/trusted-keys/trusted_dcp.c

@@ -222,7 +222,7 @@ static int trusted_dcp_seal(struct trusted_key_payload *p, char *datablob)
 		return ret;
 	}
 
-	b->payload_len = get_unaligned_le32(&p->key_len);
+	put_unaligned_le32(p->key_len, &b->payload_len);
 	p->blob_len = blen;
 	return 0;
 }