drm/v3d: Validate passed in drm syncobj handles in the performance extension

If userspace provides an unknown or invalid handle anywhere in the handle
array the rest of the driver will not handle that well.

Fix it by checking handle was looked up successfully or otherwise fail the
extension by jumping into the existing unwind.

Signed-off-by: Tvrtko Ursulin <[email protected]>
Fixes: bae7cb5 ("drm/v3d: Create a CPU job extension for the reset performance query job")
Cc: Maíra Canal <[email protected]>
Cc: Iago Toral Quiroga <[email protected]>
Cc: [email protected] # v6.8+
Reviewed-by: Maíra Canal <[email protected]>
Signed-off-by: Maíra Canal <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]
(cherry picked from commit a546b7e)
Signed-off-by: Thomas Zimmermann <[email protected]>

Author: Tvrtko Ursulin

drivers/gpu/drm/v3d/v3d_submit.c

@@ -710,6 +710,10 @@ v3d_get_cpu_reset_performance_params(struct drm_file *file_priv,
 		}
 
 		job->performance_query.queries[i].syncobj = drm_syncobj_find(file_priv, sync);
+		if (!job->performance_query.queries[i].syncobj) {
+			err = -ENOENT;
+			goto error;
+		}
 	}
 	job->performance_query.count = reset.count;
 	job->performance_query.nperfmons = reset.nperfmons;
@@ -790,6 +794,10 @@ v3d_get_cpu_copy_performance_query_params(struct drm_file *file_priv,
 		}
 
 		job->performance_query.queries[i].syncobj = drm_syncobj_find(file_priv, sync);
+		if (!job->performance_query.queries[i].syncobj) {
+			err = -ENOENT;
+			goto error;
+		}
 	}
 	job->performance_query.count = copy.count;
 	job->performance_query.nperfmons = copy.nperfmons;