[windows_kext] Fix some clippy warnings

windows_kext/wdk/src/allocator.rs

@@ -43,8 +43,8 @@ unsafe impl GlobalAlloc for WindowsAllocator {
     }
 
     unsafe fn alloc_zeroed(&self, layout: Layout) -> *mut u8 {
-        let pool = self.alloc(layout);
-        pool
+        
+        self.alloc(layout)
     }
 
     unsafe fn realloc(&self, ptr: *mut u8, layout: Layout, new_size: usize) -> *mut u8 {

windows_kext/wdk/src/filter_engine/callout_data.rs

@@ -37,9 +37,7 @@ impl ClassifyDefer {
                 }
                 ClassifyDefer::Reauthorization(_callout_id, packet_list) => {
                     // There is no way to reset single filter. If another request for filter reset is trigger at the same time it will fail.
-                    if let Err(err) = filter_engine.reset_all_filters() {
-                        return Err(err);
-                    }
+                    filter_engine.reset_all_filters()?;
                     return Ok(packet_list);
                 }
             }

windows_kext/wdk/src/filter_engine/ffi.rs

@@ -113,9 +113,7 @@ pub(crate) fn register_callout(
 
         check_ntstatus(status)?;
 
-        if let Err(err) = callout_add(filter_engine_handle, guid, layer, name, description) {
-            return Err(err);
-        }
+        callout_add(filter_engine_handle, guid, layer, name, description)?;
 
         return Ok(callout_id);
     }

windows_kext/wdk/src/filter_engine/metadata.rs

@@ -154,10 +154,10 @@ impl FwpsIncomingMetadataValues {
 #[allow(dead_code)]
 #[repr(C)]
 enum FwpsDiscardModule0 {
-    FwpsDiscardModuleNetwork = 0,
-    FwpsDiscardModuleTransport = 1,
-    FwpsDiscardModuleGeneral = 2,
-    FwpsDiscardModuleMax = 3,
+    Network = 0,
+    Transport = 1,
+    General = 2,
+    Max = 3,
 }
 
 #[repr(C)]

windows_kext/wdk/src/filter_engine/mod.rs

@@ -107,9 +107,7 @@ impl FilterEngine {
                 filter_engine.callouts = Some(boxed_callouts);
             }
 
-            if let Err(err) = filter_engine.commit() {
-                return Err(err);
-            }
+            filter_engine.commit()?
         }
         self.committed = true;
         info!("transaction committed");
@@ -147,9 +145,7 @@ impl FilterEngine {
             }
         }
         // Commit transaction.
-        if let Err(err) = filter_engine.commit() {
-            return Err(err);
-        }
+        filter_engine.commit()?;
         return Ok(());
     }
 

windows_kext/wdk/src/filter_engine/net_buffer.rs

@@ -85,7 +85,7 @@ impl NetBufferList {
                 }
 
                 // Allocate space in buffer, if buffer is too small.
-                let mut buffer = alloc::vec![0 as u8; data_length as usize];
+                let mut buffer = alloc::vec![0_u8; data_length as usize];
 
                 let ptr = NdisGetDataBuffer(nb, data_length, buffer.as_mut_ptr(), 1, 0);
 
@@ -209,7 +209,7 @@ impl Iterator for NetBufferListIter {
     }
 }
 
-pub fn read_packet_partial<'a>(nbl: *mut NET_BUFFER_LIST, buffer: &'a mut [u8]) -> Result<(), ()> {
+pub fn read_packet_partial(nbl: *mut NET_BUFFER_LIST, buffer: &mut [u8]) -> Result<(), ()> {
     unsafe {
         let Some(nbl) = nbl.as_ref() else {
             return Err(());

windows_kext/wdk/src/filter_engine/packet.rs

@@ -105,9 +105,9 @@ impl Injector {
         }
         let mut remote_ip: [u8; 16] = [0; 16];
         if ipv6 {
-            remote_ip[0..16].copy_from_slice(&remote_ip_slice);
+            remote_ip[0..16].copy_from_slice(remote_ip_slice);
         } else {
-            remote_ip[0..4].copy_from_slice(&remote_ip_slice);
+            remote_ip[0..4].copy_from_slice(remote_ip_slice);
         }
 
         TransportPacketList {

windows_kext/wdk/src/irp_helpers.rs

@@ -67,7 +67,7 @@ impl ReadRequest<'_> {
         for i in 0..bytes_to_write {
             self.buffer[self.fill_index + i] = bytes[i];
         }
-        self.fill_index = self.fill_index + bytes_to_write;
+        self.fill_index += bytes_to_write;
 
         bytes_to_write
     }
@@ -94,7 +94,7 @@ impl WriteRequest<'_> {
     }
 
     pub fn get_buffer(&self) -> &[u8] {
-        &self.buffer
+        self.buffer
     }
 
     pub fn mark_all_as_read(&mut self) {
@@ -155,7 +155,7 @@ impl DeviceControlRequest<'_> {
     }
 
     pub fn get_buffer(&self) -> &[u8] {
-        &self.buffer
+        self.buffer
     }
     pub fn write(&mut self, bytes: &[u8]) -> usize {
         let mut bytes_to_write: usize = bytes.len();
@@ -168,7 +168,7 @@ impl DeviceControlRequest<'_> {
         for i in 0..bytes_to_write {
             self.buffer[self.fill_index + i] = bytes[i];
         }
-        self.fill_index = self.fill_index + bytes_to_write;
+        self.fill_index += bytes_to_write;
 
         bytes_to_write
     }