drm_gem_shmem_create_with_handle() returns a GEM object and attach a handle to it. When the user closes the DRM FD, the core releases all GEM handles along with their backing GEM objs, which can lead to a double-free issue if panfrost_ioctl_create_bo() failed and went through the err_free path where drm_gem_object_put_unlocked() is called without deleting the associate handle.
Replace this drm_gem_object_put_unlocked() call by a drm_gem_handle_delete() one to fix that.
Fixes: f3ba91228e8e ("drm/panfrost: Add initial panfrost driver") Cc: stable@vger.kernel.org Signed-off-by: Boris Brezillon boris.brezillon@collabora.com --- Reproduced for real when BO mapping fails because we ran out of memory. --- drivers/gpu/drm/panfrost/panfrost_drv.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/panfrost/panfrost_drv.c b/drivers/gpu/drm/panfrost/panfrost_drv.c index 07b01eb3d136..cb43ff4ebf4a 100644 --- a/drivers/gpu/drm/panfrost/panfrost_drv.c +++ b/drivers/gpu/drm/panfrost/panfrost_drv.c @@ -67,7 +67,7 @@ static int panfrost_ioctl_create_bo(struct drm_device *dev, void *data, return 0;
err_free: - drm_gem_object_put_unlocked(&shmem->base); + drm_gem_handle_delete(file, args->handle); return ret; }