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staging: greybus: use after free in gb_audio_manager_remove_all() 

commit b7db58105b upstream.

When we call kobject_put() and it's the last reference to the kobject
then it calls gb_audio_module_release() and frees module.  We dereference
"module" on the next line which is a use after free.

Fixes: c77f85bbc9 ("greybus: audio: Fix incorrect counting of 'ida'")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Reviewed-by: Vaibhav Agarwal <vaibhav.sr@gmail.com>
Link: https://lore.kernel.org/r/20200205123217.jreendkyxulqsool@kili.mountain
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
5.4-rM2-2.2.x-imx-squashed
Dan Carpenter 2020-02-05 15:32:17 +03:00 committed by Greg Kroah-Hartman
parent 2ca19dfafc
commit 125b4a5345
1 changed files with 1 additions and 1 deletions
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2
drivers/staging/greybus/audio_manager.c
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@ -92,8 +92,8 @@ void gb_audio_manager_remove_all(void)
list_for_each_entry_safe(module, next, &modules_list, list) {
list_del(&module->list);
kobject_put(&module->kobj);
ida_simple_remove(&module_id, module->id);
kobject_put(&module->kobj);
}
is_empty = list_empty(&modules_list);