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drm/nouveau/disp: fix use-after-free in error handling of nouveau_connector_create

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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 2b5d1c29f6
("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: 95983aea80 ("drm/nouveau/disp: add connector class")
Signed-off-by: Karol Herbst <kherbst@redhat.com>
Reviewed-by: Lyude Paul <lyude@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230814144933.3956959-1-kherbst@redhat.com
This commit is contained in:
Karol Herbst 2023-08-14 16:49:32 +02:00
parent 96d3c1cade
commit 1b254b791d
1 changed files with 7 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

11
drivers/gpu/drm/nouveau/nouveau_connector.c
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@ -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);
}