habanalabs: Avoid double free in error flow

In case kernel context init fails during device initialization, both
hl_ctx_put() and kfree() are called, ending with a double free of the
kernel context.
Calling kfree() is needed only when a failure happens between the
allocation of the kernel context and its initialization, so move it to
there and remove it from the error flow.
Signed-off-by: Tomer Tayar <ttayar@habana.ai>
Reviewed-by: Oded Gabbay <oded.gabbay@gmail.com>
Signed-off-by: Oded Gabbay <oded.gabbay@gmail.com>

drivers/misc/habanalabs/device.c

@@ -970,7 +970,8 @@ int hl_device_init(struct hl_device *hdev, struct class *hclass)
 	rc = hl_ctx_init(hdev, hdev->kernel_ctx, true);
 	if (rc) {
 		dev_err(hdev->dev, "failed to initialize kernel context\n");
-		goto free_ctx;
+		kfree(hdev->kernel_ctx);
+		goto mmu_fini;
 	}
 
 	rc = hl_cb_pool_init(hdev);
@@ -1053,8 +1054,6 @@ int hl_device_init(struct hl_device *hdev, struct class *hclass)
 	if (hl_ctx_put(hdev->kernel_ctx) != 1)
 		dev_err(hdev->dev,
 			"kernel ctx is still alive on initialization failure\n");
-free_ctx:
-	kfree(hdev->kernel_ctx);
 mmu_fini:
 	hl_mmu_fini(hdev);
 eq_fini: