[PATCH] crypto: ti - Use list_first_entry_or_null() in dthe_get_dev()

[Mert Seftali]

dthe_get_dev() fetches a device from the global device list with
list_first_entry() and then checks the result for NULL. However,
list_first_entry() never returns NULL: on an empty list it returns a
bogus pointer computed from the list head. The NULL check is therefore
dead code, and an empty list would be treated as a valid entry and
moved around as if it were a real device.

Use list_first_entry_or_null() so the existing NULL check works as
intended and an empty list is handled gracefully.

Fixes: 52f641bc63a4 ("crypto: ti - Add driver for DTHE V2 AES Engine (ECB, CBC)")
Reported-by: kernel test robot <lkp@xxxxxxxxx>
Reported-by: Dan Carpenter <error27@xxxxxxxxx>
Closes: https://lore.kernel.org/r/202606111933.69GGTKxr-lkp@xxxxxxxxx/
Signed-off-by: Mert Seftali <mertsftl@xxxxxxxxx>
---
 drivers/crypto/ti/dthev2-common.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/crypto/ti/dthev2-common.c b/drivers/crypto/ti/dthev2-common.c
index a2ad79bec105..cc0244938267 100644
--- a/drivers/crypto/ti/dthev2-common.c
+++ b/drivers/crypto/ti/dthev2-common.c
@@ -40,7 +40,7 @@ struct dthe_data *dthe_get_dev(struct dthe_tfm_ctx *ctx)
 		return ctx->dev_data;
 
 	spin_lock_bh(&dthe_dev_list.lock);
-	dev_data = list_first_entry(&dthe_dev_list.dev_list, struct dthe_data, list);
+	dev_data = list_first_entry_or_null(&dthe_dev_list.dev_list, struct dthe_data, list);
 	if (dev_data)
 		list_move_tail(&dev_data->list, &dthe_dev_list.dev_list);
 	spin_unlock_bh(&dthe_dev_list.lock);
-- 
2.54.0