6.12-stable review patch. If anyone has any objections, please let me know.
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From: Biju Das biju.das.jz@bp.renesas.com
commit 81adbd3ff21c1182e06aa02c6be0bfd9ea02d8e8 upstream.
The host_node pointer was assigned and freed in adv7533_parse_dt(), and later, adv7533_attach_dsi() uses the same. Fix this use-after-free issue by dropping of_node_put() in adv7533_parse_dt() and calling of_node_put() in error path of probe() and also in the remove().
Fixes: 1e4d58cd7f88 ("drm/bridge: adv7533: Create a MIPI DSI device") Cc: stable@vger.kernel.org Reviewed-by: Laurent Pinchart laurent.pinchart+renesas@ideasonboard.com Signed-off-by: Biju Das biju.das.jz@bp.renesas.com Link: https://patchwork.freedesktop.org/patch/msgid/20241119192040.152657-2-biju.d... Signed-off-by: Dmitry Baryshkov dmitry.baryshkov@linaro.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/gpu/drm/bridge/adv7511/adv7511_drv.c | 10 ++++++++-- drivers/gpu/drm/bridge/adv7511/adv7533.c | 2 -- 2 files changed, 8 insertions(+), 4 deletions(-)
--- a/drivers/gpu/drm/bridge/adv7511/adv7511_drv.c +++ b/drivers/gpu/drm/bridge/adv7511/adv7511_drv.c @@ -1241,8 +1241,10 @@ static int adv7511_probe(struct i2c_clie return ret;
ret = adv7511_init_regulators(adv7511); - if (ret) - return dev_err_probe(dev, ret, "failed to init regulators\n"); + if (ret) { + dev_err_probe(dev, ret, "failed to init regulators\n"); + goto err_of_node_put; + }
/* * The power down GPIO is optional. If present, toggle it from active to @@ -1363,6 +1365,8 @@ err_i2c_unregister_edid: i2c_unregister_device(adv7511->i2c_edid); uninit_regulators: adv7511_uninit_regulators(adv7511); +err_of_node_put: + of_node_put(adv7511->host_node);
return ret; } @@ -1371,6 +1375,8 @@ static void adv7511_remove(struct i2c_cl { struct adv7511 *adv7511 = i2c_get_clientdata(i2c);
+ of_node_put(adv7511->host_node); + adv7511_uninit_regulators(adv7511);
drm_bridge_remove(&adv7511->bridge); --- a/drivers/gpu/drm/bridge/adv7511/adv7533.c +++ b/drivers/gpu/drm/bridge/adv7511/adv7533.c @@ -181,8 +181,6 @@ int adv7533_parse_dt(struct device_node if (!adv->host_node) return -ENODEV;
- of_node_put(adv->host_node); - adv->use_timing_gen = !of_property_read_bool(np, "adi,disable-timing-generator");