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 <tvrtko.ursulin@igalia.com>
Fixes: bae7cb5d6800 ("drm/v3d: Create a CPU job extension for the reset performance query job")
Cc: Maíra Canal <mcanal@igalia.com>
Cc: Iago Toral Quiroga <itoral@igalia.com>
Cc: stable@vger.kernel.org # v6.8+
Reviewed-by: Maíra Canal <mcanal@igalia.com>
Signed-off-by: Maíra Canal <mcanal@igalia.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240711135340.84617-6-tursulin@igalia.com
(cherry picked from commit a546b7e4d73c23838d7e4d2c92882b3ca902d213)
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>

diff --git a/drivers/gpu/drm/v3d/v3d_submit.c b/drivers/gpu/drm/v3d/v3d_submit.c
index 9a3e32075ebeb9918197abcef4d8b358de4aca0c..4cdfabbf4964f9b9a71343d3f97b466781773bef 100644 (file)
--- a/drivers/gpu/drm/v3d/v3d_submit.c
+++ b/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;