diff options
| author | Andrei Kuchynski <akuchynski@chromium.org> | 2026-04-27 13:17:21 +0000 |
|---|---|---|
| committer | Lee Jones <lee@kernel.org> | 2026-06-17 11:32:23 +0100 |
| commit | 8b2c1d41bc36c100b38ce5ee6def246c527eaf8a (patch) | |
| tree | 631eab09bf5e9af714b548d4e6e66559fbdba67a | |
| parent | 2611c4d623ba867e196a4146f1927c3c468ac2bc (diff) | |
mfd: cros_ec: Delay dev_set_drvdata() until probe success
If ec_device_probe() fails, cros_ec_class_release releases memory for the
cros_ec_dev structure. However, because the drvdata was already set,
sub-drivers like cros_ec_typec can still retrieve the stale pointer via the
platform device. This leads to a use-after-free when cros_ec_typec attempts
to access &typec->ec->ec->dev on a device that has already been released.
Move dev_set_drvdata() to ensure that the pointer is only made available
once all initialization steps have succeeded.
sysfs: cannot create duplicate filename '/class/chromeos/cros_ec'
Call trace:
sysfs_do_create_link_sd+0x94/0xdc
sysfs_create_link+0x30/0x44
device_add_class_symlinks+0x90/0x13c
device_add+0xf0/0x50c
ec_device_probe+0x150/0x4f0
platform_probe+0xa0/0xe0
...
BUG: KASAN: invalid-access in __memcpy+0x44/0x230
Write at addr f5ffff809e2d33ac by task kworker/u32:5/125
Pointer tag: [f5], memory tag: [fe]
Tainted : [W]=WARN, [O]=OOT_MODULE
Hardware name: Google Navi unprovisioned 0x7FFFFFFF/sku0 board/sku3
Workqueue: events_unbound deferred_probe_work_func
Call trace:
__memcpy+0x44/0x230
cros_ec_check_features+0x60/0xcc [cros_ec_proto]
cros_typec_probe+0xe8/0x6e0 [cros_ec_typec]
platform_probe+0xa0/0xe0
Cc: stable@vger.kernel.org
Fixes: 1c1d152cc5ac ("platform/chrome: cros_ec_dev - utilize new cdev_device_add helper function")
Co-developed-by: Sergey Senozhatsky <senozhatsky@chromium.org>
Signed-off-by: Sergey Senozhatsky <senozhatsky@chromium.org>
Signed-off-by: Andrei Kuchynski <akuchynski@chromium.org>
Reviewed-by: Benson Leung <bleung@chromium.org>
Link: https://patch.msgid.link/20260427131721.1165078-1-akuchynski@chromium.org
Signed-off-by: Lee Jones <lee@kernel.org>
| -rw-r--r-- | drivers/mfd/cros_ec_dev.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/mfd/cros_ec_dev.c b/drivers/mfd/cros_ec_dev.c index 70d64b7c6243..11ee1146cf71 100644 --- a/drivers/mfd/cros_ec_dev.c +++ b/drivers/mfd/cros_ec_dev.c @@ -191,7 +191,6 @@ static int ec_device_probe(struct platform_device *pdev) if (!ec) return retval; - dev_set_drvdata(dev, ec); ec->ec_dev = dev_get_drvdata(dev->parent); ec->dev = dev; ec->cmd_offset = ec_platform->cmd_offset; @@ -233,6 +232,8 @@ static int ec_device_probe(struct platform_device *pdev) if (retval) goto failed; + dev_set_drvdata(dev, ec); + /* check whether this EC is a sensor hub. */ if (cros_ec_get_sensor_count(ec) > 0) { retval = mfd_add_hotplug_devices(ec->dev, |