diff --git a/drivers/hid/bpf/hid_bpf_dispatch.c b/drivers/hid/bpf/hid_bpf_dispatch.c
index 0ef99caf937a..efd4e4b4a615 100644
--- a/drivers/hid/bpf/hid_bpf_dispatch.c
+++ b/drivers/hid/bpf/hid_bpf_dispatch.c
@@ -28,8 +28,9 @@ EXPORT_SYMBOL(hid_bpf_ops);
  *
  * @ctx: The HID-BPF context
  *
- * @return %0 on success and keep processing; a negative error code to interrupt
- * the processing of this event
+ * @return %0 on success and keep processing; a positive value to change the
+ * incoming size buffer; a negative error code to interrupt the processing
+ * of this event
  *
  * Declare an %fmod_ret tracing bpf program to this function and attach this
  * program through hid_bpf_attach_prog() to have this helper called for
@@ -44,23 +45,43 @@ __weak noinline int hid_bpf_device_event(struct hid_bpf_ctx *ctx)
 }
 ALLOW_ERROR_INJECTION(hid_bpf_device_event, ERRNO);
 
-int
+u8 *
 dispatch_hid_bpf_device_event(struct hid_device *hdev, enum hid_report_type type, u8 *data,
-			      u32 size, int interrupt)
+			      u32 *size, int interrupt)
 {
 	struct hid_bpf_ctx_kern ctx_kern = {
 		.ctx = {
 			.hid = hdev,
 			.report_type = type,
-			.size = size,
+			.allocated_size = hdev->bpf.allocated_data,
+			.size = *size,
 		},
-		.data = data,
+		.data = hdev->bpf.device_data,
 	};
+	int ret;
 
 	if (type >= HID_REPORT_TYPES)
-		return -EINVAL;
+		return ERR_PTR(-EINVAL);
+
+	/* no program has been attached yet */
+	if (!hdev->bpf.device_data)
+		return data;
+
+	memset(ctx_kern.data, 0, hdev->bpf.allocated_data);
+	memcpy(ctx_kern.data, data, *size);
+
+	ret = hid_bpf_prog_run(hdev, HID_BPF_PROG_TYPE_DEVICE_EVENT, &ctx_kern);
+	if (ret < 0)
+		return ERR_PTR(ret);
+
+	if (ret) {
+		if (ret > ctx_kern.ctx.allocated_size)
+			return ERR_PTR(-EINVAL);
 
-	return hid_bpf_prog_run(hdev, HID_BPF_PROG_TYPE_DEVICE_EVENT, &ctx_kern);
+		*size = ret;
+	}
+
+	return ctx_kern.data;
 }
 EXPORT_SYMBOL_GPL(dispatch_hid_bpf_device_event);
 
@@ -83,7 +104,7 @@ hid_bpf_get_data(struct hid_bpf_ctx *ctx, unsigned int offset, const size_t rdwr
 
 	ctx_kern = container_of(ctx, struct hid_bpf_ctx_kern, ctx);
 
-	if (rdwr_buf_size + offset > ctx->size)
+	if (rdwr_buf_size + offset > ctx->allocated_size)
 		return NULL;
 
 	return ctx_kern->data + offset;
@@ -110,6 +131,51 @@ static int device_match_id(struct device *dev, const void *id)
 	return hdev->id == *(int *)id;
 }
 
+static int __hid_bpf_allocate_data(struct hid_device *hdev, u8 **data, u32 *size)
+{
+	u8 *alloc_data;
+	unsigned int i, j, max_report_len = 0;
+	size_t alloc_size = 0;
+
+	/* compute the maximum report length for this device */
+	for (i = 0; i < HID_REPORT_TYPES; i++) {
+		struct hid_report_enum *report_enum = hdev->report_enum + i;
+
+		for (j = 0; j < HID_MAX_IDS; j++) {
+			struct hid_report *report = report_enum->report_id_hash[j];
+
+			if (report)
+				max_report_len = max(max_report_len, hid_report_len(report));
+		}
+	}
+
+	/*
+	 * Give us a little bit of extra space and some predictability in the
+	 * buffer length we create. This way, we can tell users that they can
+	 * work on chunks of 64 bytes of memory without having the bpf verifier
+	 * scream at them.
+	 */
+	alloc_size = DIV_ROUND_UP(max_report_len, 64) * 64;
+
+	alloc_data = kzalloc(alloc_size, GFP_KERNEL);
+	if (!alloc_data)
+		return -ENOMEM;
+
+	*data = alloc_data;
+	*size = alloc_size;
+
+	return 0;
+}
+
+static int hid_bpf_allocate_event_data(struct hid_device *hdev)
+{
+	/* hdev->bpf.device_data is already allocated, abort */
+	if (hdev->bpf.device_data)
+		return 0;
+
+	return __hid_bpf_allocate_data(hdev, &hdev->bpf.device_data, &hdev->bpf.allocated_data);
+}
+
 /**
  * hid_bpf_attach_prog - Attach the given @prog_fd to the given HID device
  *
@@ -125,7 +191,7 @@ hid_bpf_attach_prog(unsigned int hid_id, int prog_fd, __u32 flags)
 {
 	struct hid_device *hdev;
 	struct device *dev;
-	int prog_type = hid_bpf_get_prog_attach_type(prog_fd);
+	int err, prog_type = hid_bpf_get_prog_attach_type(prog_fd);
 
 	if (!hid_bpf_ops)
 		return -EINVAL;
@@ -145,6 +211,12 @@ hid_bpf_attach_prog(unsigned int hid_id, int prog_fd, __u32 flags)
 
 	hdev = to_hid_device(dev);
 
+	if (prog_type == HID_BPF_PROG_TYPE_DEVICE_EVENT) {
+		err = hid_bpf_allocate_event_data(hdev);
+		if (err)
+			return err;
+	}
+
 	return __hid_bpf_attach_prog(hdev, prog_type, prog_fd, flags);
 }
 
@@ -158,6 +230,30 @@ static const struct btf_kfunc_id_set hid_bpf_syscall_kfunc_set = {
 	.set   = &hid_bpf_syscall_kfunc_ids,
 };
 
+int hid_bpf_connect_device(struct hid_device *hdev)
+{
+	struct hid_bpf_prog_list *prog_list;
+
+	rcu_read_lock();
+	prog_list = rcu_dereference(hdev->bpf.progs[HID_BPF_PROG_TYPE_DEVICE_EVENT]);
+	rcu_read_unlock();
+
+	/* only allocate BPF data if there are programs attached */
+	if (!prog_list)
+		return 0;
+
+	return hid_bpf_allocate_event_data(hdev);
+}
+EXPORT_SYMBOL_GPL(hid_bpf_connect_device);
+
+void hid_bpf_disconnect_device(struct hid_device *hdev)
+{
+	kfree(hdev->bpf.device_data);
+	hdev->bpf.device_data = NULL;
+	hdev->bpf.allocated_data = 0;
+}
+EXPORT_SYMBOL_GPL(hid_bpf_disconnect_device);
+
 void hid_bpf_destroy_device(struct hid_device *hdev)
 {
 	if (!hdev)
diff --git a/drivers/hid/bpf/hid_bpf_jmp_table.c b/drivers/hid/bpf/hid_bpf_jmp_table.c
index e5f171ab480c..bfcdd7b805a9 100644
--- a/drivers/hid/bpf/hid_bpf_jmp_table.c
+++ b/drivers/hid/bpf/hid_bpf_jmp_table.c
@@ -122,8 +122,10 @@ int hid_bpf_prog_run(struct hid_device *hdev, enum hid_bpf_prog_type type,
 
 		ctx_kern->ctx.index = idx;
 		err = __hid_bpf_tail_call(&ctx_kern->ctx);
-		if (err)
+		if (err < 0)
 			break;
+		if (err)
+			ctx_kern->ctx.retval = err;
 	}
 
  out_unlock:
diff --git a/drivers/hid/hid-core.c b/drivers/hid/hid-core.c
index 1098c49b5d2e..400a7b8133c6 100644
--- a/drivers/hid/hid-core.c
+++ b/drivers/hid/hid-core.c
@@ -2040,9 +2040,11 @@ int hid_input_report(struct hid_device *hid, enum hid_report_type type, u8 *data
 	report_enum = hid->report_enum + type;
 	hdrv = hid->driver;
 
-	ret = dispatch_hid_bpf_device_event(hid, type, data, size, interrupt);
-	if (ret)
+	data = dispatch_hid_bpf_device_event(hid, type, data, &size, interrupt);
+	if (IS_ERR(data)) {
+		ret = PTR_ERR(data);
 		goto unlock;
+	}
 
 	if (!size) {
 		dbg_hid("empty report\n");
@@ -2158,6 +2160,10 @@ int hid_connect(struct hid_device *hdev, unsigned int connect_mask)
 	int len;
 	int ret;
 
+	ret = hid_bpf_connect_device(hdev);
+	if (ret)
+		return ret;
+
 	if (hdev->quirks & HID_QUIRK_HIDDEV_FORCE)
 		connect_mask |= (HID_CONNECT_HIDDEV_FORCE | HID_CONNECT_HIDDEV);
 	if (hdev->quirks & HID_QUIRK_HIDINPUT_FORCE)
@@ -2259,6 +2265,8 @@ void hid_disconnect(struct hid_device *hdev)
 	if (hdev->claimed & HID_CLAIMED_HIDRAW)
 		hidraw_disconnect(hdev);
 	hdev->claimed = 0;
+
+	hid_bpf_disconnect_device(hdev);
 }
 EXPORT_SYMBOL_GPL(hid_disconnect);
 
diff --git a/include/linux/hid_bpf.h b/include/linux/hid_bpf.h
index de3fb1c376d2..b3de462ef3a6 100644
--- a/include/linux/hid_bpf.h
+++ b/include/linux/hid_bpf.h
@@ -28,15 +28,32 @@ struct hid_device;
  *         a bigger index).
  * @hid: the ``struct hid_device`` representing the device itself
  * @report_type: used for ``hid_bpf_device_event()``
+ * @allocated_size: Allocated size of data.
+ *
+ *                  This is how much memory is available and can be requested
+ *                  by the HID program.
+ *                  Note that for ``HID_BPF_RDESC_FIXUP``, that memory is set to
+ *                  ``4096`` (4 KB)
  * @size: Valid data in the data field.
  *
  *        Programs can get the available valid size in data by fetching this field.
+ *        Programs can also change this value by returning a positive number in the
+ *        program.
+ *        To discard the event, return a negative error code.
+ *
+ *        ``size`` must always be less or equal than ``allocated_size`` (it is enforced
+ *        once all BPF programs have been run).
+ * @retval: Return value of the previous program.
  */
 struct hid_bpf_ctx {
 	__u32 index;
 	const struct hid_device *hid;
+	__u32 allocated_size;
 	enum hid_report_type report_type;
-	__s32 size;
+	union {
+		__s32 retval;
+		__s32 size;
+	};
 };
 
 /**
@@ -96,6 +113,12 @@ struct hid_bpf_prog_list {
 
 /* stored in each device */
 struct hid_bpf {
+	u8 *device_data;		/* allocated when a bpf program of type
+					 * SEC(f.../hid_bpf_device_event) has been attached
+					 * to this HID device
+					 */
+	u32 allocated_data;
+
 	struct hid_bpf_prog_list __rcu *progs[HID_BPF_PROG_TYPE_MAX];	/* attached BPF progs */
 	bool destroyed;			/* prevents the assignment of any progs */
 
@@ -103,13 +126,17 @@ struct hid_bpf {
 };
 
 #ifdef CONFIG_HID_BPF
-int dispatch_hid_bpf_device_event(struct hid_device *hid, enum hid_report_type type, u8 *data,
-				  u32 size, int interrupt);
+u8 *dispatch_hid_bpf_device_event(struct hid_device *hid, enum hid_report_type type, u8 *data,
+				  u32 *size, int interrupt);
+int hid_bpf_connect_device(struct hid_device *hdev);
+void hid_bpf_disconnect_device(struct hid_device *hdev);
 void hid_bpf_destroy_device(struct hid_device *hid);
 void hid_bpf_device_init(struct hid_device *hid);
 #else /* CONFIG_HID_BPF */
-static inline int dispatch_hid_bpf_device_event(struct hid_device *hid, enum hid_report_type type,
-						u8 *data, u32 size, int interrupt) { return 0; }
+static inline u8 *dispatch_hid_bpf_device_event(struct hid_device *hid, enum hid_report_type type,
+						u8 *data, u32 *size, int interrupt) { return NULL; }
+static inline int hid_bpf_connect_device(struct hid_device *hdev) { return 0; }
+static inline void hid_bpf_disconnect_device(struct hid_device *hdev) {}
 static inline void hid_bpf_destroy_device(struct hid_device *hid) {}
 static inline void hid_bpf_device_init(struct hid_device *hid) {}
 #endif /* CONFIG_HID_BPF */
