This is a note to let you know that I've just added the patch titled
iio: core: fix double free in iio_device_unregister_sysfs()
to the 5.14-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:
iio-core-fix-double-free-in-iio_device_unregister_sysfs.patch
and it can be found in the queue-5.14 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 19833c40d0415d6fe4340b5b9c46239abbf718f6 Mon Sep 17 00:00:00 2001
From: Yang Yingliang <yangyingliang@xxxxxxxxxx>
Date: Wed, 13 Oct 2021 11:05:32 +0800
Subject: iio: core: fix double free in iio_device_unregister_sysfs()
From: Yang Yingliang <yangyingliang@xxxxxxxxxx>
commit 19833c40d0415d6fe4340b5b9c46239abbf718f6 upstream.
I got the double free report:
BUG: KASAN: double-free or invalid-free in kfree+0xce/0x390
iio_device_unregister_sysfs+0x108/0x13b [industrialio]
iio_dev_release+0x9e/0x10e [industrialio]
device_release+0xa5/0x240
If __iio_device_register() fails, iio_dev_opaque->groups will be freed
in error path in iio_device_unregister_sysfs(), then iio_dev_release()
will call iio_device_unregister_sysfs() again, it causes double free.
Set iio_dev_opaque->groups to NULL when it's freed to fix this double free.
Not this is a local work around for a more general mess around life time
management that will get cleaned up and should make this handling
unnecesarry.
Fixes: 32f171724e5c ("iio: core: rework iio device group creation")
Reported-by: Hulk Robot <hulkci@xxxxxxxxxx>
Reviewed-by: Alexandru Ardelean <ardeleanalex@xxxxxxxxx>
Signed-off-by: Yang Yingliang <yangyingliang@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20211013030532.956133-1-yangyingliang@xxxxxxxxxx
Cc: <Stable@xxxxxxxxxxxxxxx>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/iio/industrialio-core.c | 1 +
1 file changed, 1 insertion(+)
--- a/drivers/iio/industrialio-core.c
+++ b/drivers/iio/industrialio-core.c
@@ -1597,6 +1597,7 @@ static void iio_device_unregister_sysfs(
kfree(iio_dev_opaque->chan_attr_group.attrs);
iio_dev_opaque->chan_attr_group.attrs = NULL;
kfree(iio_dev_opaque->groups);
+ iio_dev_opaque->groups = NULL;
}
static void iio_dev_release(struct device *device)
Patches currently in stable-queue which might be from yangyingliang@xxxxxxxxxx are
queue-5.14/asoc-soc-core-fix-null-ptr-deref-in-snd_soc_del_comp.patch
queue-5.14/iio-core-fix-double-free-in-iio_device_unregister_sysfs.patch
queue-5.14/iio-core-check-return-value-when-calling-dev_set_name.patch
