This is a note to let you know that I've just added the patch titled
usb: misc: ljca: Fix double free in error handling path
to the 6.8-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
usb-misc-ljca-fix-double-free-in-error-handling-path.patch
and it can be found in the queue-6.8 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 7c9631969287a5366bc8e39cd5abff154b35fb80 Mon Sep 17 00:00:00 2001
From: Yongzhi Liu <hyperlyzcs@xxxxxxxxx>
Date: Mon, 11 Mar 2024 20:57:48 +0800
Subject: usb: misc: ljca: Fix double free in error handling path
From: Yongzhi Liu <hyperlyzcs@xxxxxxxxx>
commit 7c9631969287a5366bc8e39cd5abff154b35fb80 upstream.
When auxiliary_device_add() returns error and then calls
auxiliary_device_uninit(), callback function ljca_auxdev_release
calls kfree(auxdev->dev.platform_data) to free the parameter data
of the function ljca_new_client_device. The callers of
ljca_new_client_device shouldn't call kfree() again
in the error handling path to free the platform data.
Fix this by cleaning up the redundant kfree() in all callers and
adding kfree() the passed in platform_data on errors which happen
before auxiliary_device_init() succeeds .
Fixes: acd6199f195d ("usb: Add support for Intel LJCA device")
Cc: stable <stable@xxxxxxxxxx>
Signed-off-by: Yongzhi Liu <hyperlyzcs@xxxxxxxxx>
Reviewed-by: Hans de Goede <hdegoede@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20240311125748.28198-1-hyperlyzcs@xxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/usb/misc/usb-ljca.c | 22 +++++++++-------------
1 file changed, 9 insertions(+), 13 deletions(-)
--- a/drivers/usb/misc/usb-ljca.c
+++ b/drivers/usb/misc/usb-ljca.c
@@ -518,8 +518,10 @@ static int ljca_new_client_device(struct
int ret;
client = kzalloc(sizeof *client, GFP_KERNEL);
- if (!client)
+ if (!client) {
+ kfree(data);
return -ENOMEM;
+ }
client->type = type;
client->id = id;
@@ -535,8 +537,10 @@ static int ljca_new_client_device(struct
auxdev->dev.release = ljca_auxdev_release;
ret = auxiliary_device_init(auxdev);
- if (ret)
+ if (ret) {
+ kfree(data);
goto err_free;
+ }
ljca_auxdev_acpi_bind(adap, auxdev, adr, id);
@@ -590,12 +594,8 @@ static int ljca_enumerate_gpio(struct lj
valid_pin[i] = get_unaligned_le32(&desc->bank_desc[i].valid_pins);
bitmap_from_arr32(gpio_info->valid_pin_map, valid_pin, gpio_num);
- ret = ljca_new_client_device(adap, LJCA_CLIENT_GPIO, 0, "ljca-gpio",
+ return ljca_new_client_device(adap, LJCA_CLIENT_GPIO, 0, "ljca-gpio",
gpio_info, LJCA_GPIO_ACPI_ADR);
- if (ret)
- kfree(gpio_info);
-
- return ret;
}
static int ljca_enumerate_i2c(struct ljca_adapter *adap)
@@ -629,10 +629,8 @@ static int ljca_enumerate_i2c(struct ljc
ret = ljca_new_client_device(adap, LJCA_CLIENT_I2C, i,
"ljca-i2c", i2c_info,
LJCA_I2C1_ACPI_ADR + i);
- if (ret) {
- kfree(i2c_info);
+ if (ret)
return ret;
- }
}
return 0;
@@ -669,10 +667,8 @@ static int ljca_enumerate_spi(struct ljc
ret = ljca_new_client_device(adap, LJCA_CLIENT_SPI, i,
"ljca-spi", spi_info,
LJCA_SPI1_ACPI_ADR + i);
- if (ret) {
- kfree(spi_info);
+ if (ret)
return ret;
- }
}
return 0;
Patches currently in stable-queue which might be from hyperlyzcs@xxxxxxxxx are
queue-6.8/usb-misc-ljca-fix-double-free-in-error-handling-path.patch
