[PATCH] crypto: omap-sham: fix crypto engine cleanup

[Guangshuo Li]

omap_sham_probe() allocates and starts a crypto engine, but the remove
path does not call the matching crypto_engine_exit(). The probe failure
path already performs this cleanup.

crypto_engine_alloc_init() creates a kthread worker for processing
requests. Without crypto_engine_exit() during driver removal, the
worker is left running after the device is removed.

Call crypto_engine_exit() after unregistering the algorithms and before
tearing down the remaining request handling resources. This stops the
engine and destroys its worker.

This issue was found by manual code inspection.

Fixes: 133c3d434d91 ("crypto: omap-sham - convert to use crypto engine")
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Guangshuo Li <lgs201920130244@xxxxxxxxx>
---
 drivers/crypto/omap-sham.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/crypto/omap-sham.c b/drivers/crypto/omap-sham.c
index 6d2dd0b88f15..207fc7680c8f 100644
--- a/drivers/crypto/omap-sham.c
+++ b/drivers/crypto/omap-sham.c
@@ -2129,6 +2129,7 @@ static void omap_sham_remove(struct platform_device *pdev)
 	list_del(&dd->list);
 	spin_unlock_bh(&sham.lock);
 	omap_sham_unregister_algs(dd->pdata);
+	crypto_engine_exit(dd->engine);
 	cancel_work_sync(&dd->done_task);
 	pm_runtime_dont_use_autosuspend(&pdev->dev);
 	pm_runtime_disable(&pdev->dev);
-- 
2.43.0