@@ -812,8 +812,7 @@ static int iio_device_add_channel_sysfs(struct iio_dev *indio_dev,
* @attr_list: List of IIO device attributes
*
* This function frees the memory allocated for each of the IIO device
- * attributes in the list. Note: if you want to reuse the list after calling
- * this function you have to reinitialize it using INIT_LIST_HEAD().
+ * attributes in the list.
*/
void iio_free_chan_devattr_list(struct list_head *attr_list)
{
@@ -821,6 +820,7 @@ void iio_free_chan_devattr_list(struct list_head *attr_list)
list_for_each_entry_safe(p, n, attr_list, l) {
kfree(p->dev_attr.attr.name);
+ list_del(&p->l);
kfree(p);
}
}
@@ -901,6 +901,7 @@ static void iio_device_unregister_sysfs(struct iio_dev *indio_dev)
iio_free_chan_devattr_list(&indio_dev->channel_attr_list);
kfree(indio_dev->chan_attr_group.attrs);
+ indio_dev->chan_attr_group.attrs = NULL;
}
static void iio_dev_release(struct device *device)
@@ -596,6 +596,7 @@ int iio_device_register_eventset(struct iio_dev *indio_dev)
error_free_setup_event_lines:
iio_free_chan_devattr_list(&indio_dev->event_interface->dev_attr_list);
kfree(indio_dev->event_interface);
+ indio_dev->event_interface = NULL;
error_ret:
return ret;
This is a note to let you know that I have just added a patch titled iio: core: Fix double free. to the linux-3.13.y-queue branch of the 3.13.y-ckt extended stable tree which can be found at: http://kernel.ubuntu.com/git/ubuntu/linux.git/log/?h=linux-3.13.y-queue This patch is scheduled to be released in version 3.13.11-ckt20. If you, or anyone else, feels it should not be added to this tree, please reply to this email. For more information about the 3.13.y-ckt tree, see https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable Thanks. -Kamal ------ From e3758a0de8db0c8a56ae4722022230e9e238c131 Mon Sep 17 00:00:00 2001 From: Martin Fuzzey <mfuzzey@parkeon.com> Date: Thu, 19 Feb 2015 15:17:44 +0100 Subject: iio: core: Fix double free. commit c1b03ab5e886760bdd38c9c7a27af149046ffe01 upstream. When an error occurred during event registration memory was freed twice resulting in kernel memory corruption and a crash in unrelated code. The problem was caused by iio_device_unregister_eventset() iio_device_unregister_sysfs() being called twice, once on the error path and then again via iio_dev_release(). Fix this by making these two functions idempotent so they may be called multiple times. The problem was observed before applying 78b33216 iio:core: Handle error when mask type is not separate Signed-off-by: Martin Fuzzey <mfuzzey@parkeon.com> Signed-off-by: Jonathan Cameron <jic23@kernel.org> Signed-off-by: Kamal Mostafa <kamal@canonical.com> --- drivers/iio/industrialio-core.c | 5 +++-- drivers/iio/industrialio-event.c | 1 + 2 files changed, 4 insertions(+), 2 deletions(-) -- 1.9.1