Commit 04fc52fb authored by Maciej Purski's avatar Maciej Purski Committed by Inki Dae

drm/exynos/hdmi: Fix unsafe list iteration

Function hdmi_mode_fixup() used bare list_for_each entry, which was
unsafe and caused memory corruption detected by kasan.
It now uses drm_for_each_connector_iter macro, which is now recommended
by the documentation and safe.
Signed-off-by: default avatarMaciej Purski <m.purski@samsung.com>
Signed-off-by: default avatarInki Dae <inki.dae@samsung.com>
parent 9ac30ef6
......@@ -944,22 +944,27 @@ static bool hdmi_mode_fixup(struct drm_encoder *encoder,
struct drm_device *dev = encoder->dev;
struct drm_connector *connector;
struct drm_display_mode *m;
struct drm_connector_list_iter conn_iter;
int mode_ok;
drm_mode_set_crtcinfo(adjusted_mode, 0);
list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
drm_connector_list_iter_begin(dev, &conn_iter);
drm_for_each_connector_iter(connector, &conn_iter) {
if (connector->encoder == encoder)
break;
}
if (connector)
drm_connector_get(connector);
drm_connector_list_iter_end(&conn_iter);
if (connector->encoder != encoder)
if (!connector)
return true;
mode_ok = hdmi_mode_valid(connector, adjusted_mode);
if (mode_ok == MODE_OK)
return true;
goto cleanup;
/*
* Find the most suitable mode and copy it to adjusted_mode.
......@@ -979,6 +984,9 @@ static bool hdmi_mode_fixup(struct drm_encoder *encoder,
}
}
cleanup:
drm_connector_put(connector);
return true;
}
......
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