dmaengine: idxd: fix memory leak in error handling path of idxd_setup_engines

Memory allocated for engines is not freed if an error occurs during
idxd_setup_engines(). To fix it, free the allocated memory in the
reverse order of allocation before exiting the function in case of an
error.

Fixes: 75b9113 ("dmaengine: idxd: fix engine conf_dev lifetime")
Cc: [email protected]
Signed-off-by: Shuai Xue <[email protected]>
Reviewed-by: Dave Jiang <[email protected]>
Reviewed-by: Fenghua Yu <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Vinod Koul <[email protected]>

Author: axiqia

drivers/dma/idxd/init.c

@@ -275,6 +275,7 @@ static int idxd_setup_engines(struct idxd_device *idxd)
 		rc = dev_set_name(conf_dev, "engine%d.%d", idxd->id, engine->id);
 		if (rc < 0) {
 			put_device(conf_dev);
+			kfree(engine);
 			goto err;
 		}
 
@@ -288,7 +289,10 @@ static int idxd_setup_engines(struct idxd_device *idxd)
 		engine = idxd->engines[i];
 		conf_dev = engine_confdev(engine);
 		put_device(conf_dev);
+		kfree(engine);
 	}
+	kfree(idxd->engines);
+
 	return rc;
 }