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: Maciej Purski m.purski@samsung.com --- drivers/gpu/drm/exynos/exynos_hdmi.c | 14 +++++++++++--- 1 file changed, 11 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/exynos/exynos_hdmi.c b/drivers/gpu/drm/exynos/exynos_hdmi.c index 214fa5e..0109ff4 100644 --- a/drivers/gpu/drm/exynos/exynos_hdmi.c +++ b/drivers/gpu/drm/exynos/exynos_hdmi.c @@ -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; }