From: Karol Herbst Date: Mon, 14 Aug 2023 14:49:32 +0000 (+0200) Subject: drm/nouveau/disp: fix use-after-free in error handling of nouveau_connector_create X-Git-Tag: v6.6.17~3690^2~2^2~60 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=1b254b791d7b7dea6e8adc887fbbd51746d8bb27;p=platform%2Fkernel%2Flinux-rpi.git drm/nouveau/disp: fix use-after-free in error handling of nouveau_connector_create We can't simply free the connector after calling drm_connector_init on it. We need to clean up the drm side first. It might not fix all regressions from commit 2b5d1c29f6c4 ("drm/nouveau/disp: PIOR DP uses GPIO for HPD, not PMGR AUX interrupts"), but at least it fixes a memory corruption in error handling related to that commit. Link: https://lore.kernel.org/lkml/20230806213107.GFZNARG6moWpFuSJ9W@fat_crate.local/ Fixes: 95983aea8003 ("drm/nouveau/disp: add connector class") Signed-off-by: Karol Herbst Reviewed-by: Lyude Paul Link: https://patchwork.freedesktop.org/patch/msgid/20230814144933.3956959-1-kherbst@redhat.com --- diff --git a/drivers/gpu/drm/nouveau/nouveau_connector.c b/drivers/gpu/drm/nouveau/nouveau_connector.c index a2e0033e8a..622f6eb 100644 --- a/drivers/gpu/drm/nouveau/nouveau_connector.c +++ b/drivers/gpu/drm/nouveau/nouveau_connector.c @@ -1408,8 +1408,7 @@ nouveau_connector_create(struct drm_device *dev, ret = nvif_conn_ctor(&disp->disp, nv_connector->base.name, nv_connector->index, &nv_connector->conn); if (ret) { - kfree(nv_connector); - return ERR_PTR(ret); + goto drm_conn_err; } ret = nvif_conn_event_ctor(&nv_connector->conn, "kmsHotplug", @@ -1426,8 +1425,7 @@ nouveau_connector_create(struct drm_device *dev, if (ret) { nvif_event_dtor(&nv_connector->hpd); nvif_conn_dtor(&nv_connector->conn); - kfree(nv_connector); - return ERR_PTR(ret); + goto drm_conn_err; } } } @@ -1475,4 +1473,9 @@ nouveau_connector_create(struct drm_device *dev, drm_connector_register(connector); return connector; + +drm_conn_err: + drm_connector_cleanup(connector); + kfree(nv_connector); + return ERR_PTR(ret); }