[Intel-xe] [PATCH] drm/xe: Fix unreffed ptr leak on engine lookup

[Mika Kuoppala]

The engine xarray holds a ref to engine, guarded by the lock.
While we do lookup for engine, we need to take the ref inside
the lock to prevent unreffed pointer escaping and
causing potential use-after-free after.

v2: remove branch prediction hint (Thomas)

Cc: Thomas Hellström <thomas.hellstrom at linux.intel.com>
Signed-off-by: Mika Kuoppala <mika.kuoppala at linux.intel.com>
---
 drivers/gpu/drm/xe/xe_engine.c | 16 ++++++++--------
 1 file changed, 8 insertions(+), 8 deletions(-)

diff --git a/drivers/gpu/drm/xe/xe_engine.c b/drivers/gpu/drm/xe/xe_engine.c
index b3036c4a8ec3..0e147bcefa68 100644
--- a/drivers/gpu/drm/xe/xe_engine.c
+++ b/drivers/gpu/drm/xe/xe_engine.c
@@ -161,10 +161,9 @@ struct xe_engine *xe_engine_lookup(struct xe_file *xef, u32 id)
 
 	mutex_lock(&xef->engine.lock);
 	e = xa_load(&xef->engine.xa, id);
-	mutex_unlock(&xef->engine.lock);
-
 	if (e)
 		xe_engine_get(e);
+	mutex_unlock(&xef->engine.lock);
 
 	return e;
 }
@@ -641,26 +640,27 @@ int xe_engine_get_property_ioctl(struct drm_device *dev, void *data,
 	struct xe_file *xef = to_xe_file(file);
 	struct drm_xe_engine_get_property *args = data;
 	struct xe_engine *e;
+	int ret;
 
 	if (XE_IOCTL_ERR(xe, args->reserved[0] || args->reserved[1]))
 		return -EINVAL;
 
-	mutex_lock(&xef->engine.lock);
-	e = xa_load(&xef->engine.xa, args->engine_id);
-	mutex_unlock(&xef->engine.lock);
-
+	e = xe_engine_lookup(xef, args->engine_id);
 	if (XE_IOCTL_ERR(xe, !e))
 		return -ENOENT;
 
 	switch (args->property) {
 	case XE_ENGINE_GET_PROPERTY_BAN:
 		args->value = !!(e->flags & ENGINE_FLAG_BANNED);
+		ret = 0;
 		break;
 	default:
-		return -EINVAL;
+		ret = -EINVAL;
 	}
 
-	return 0;
+	xe_engine_put(e);
+
+	return ret;
 }
 
 static void engine_kill_compute(struct xe_engine *e)
-- 
2.34.1