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: c77f85bbc91a ("greybus: audio: Fix incorrect counting of 'ida'") Signed-off-by: Dan Carpenter dan.carpenter@oracle.com --- drivers/staging/greybus/audio_manager.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/staging/greybus/audio_manager.c b/drivers/staging/greybus/audio_manager.c index 9b19ea9d3fa1..9a3f7c034ab4 100644 --- a/drivers/staging/greybus/audio_manager.c +++ b/drivers/staging/greybus/audio_manager.c @@ -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);
On Wed, Feb 5, 2020 at 6:02 PM Dan Carpenter dan.carpenter@oracle.com wrote:
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: c77f85bbc91a ("greybus: audio: Fix incorrect counting of 'ida'") Signed-off-by: Dan Carpenter dan.carpenter@oracle.com
drivers/staging/greybus/audio_manager.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/staging/greybus/audio_manager.c b/drivers/staging/greybus/audio_manager.c index 9b19ea9d3fa1..9a3f7c034ab4 100644 --- a/drivers/staging/greybus/audio_manager.c +++ b/drivers/staging/greybus/audio_manager.c @@ -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);-- 2.11.0
Thanks Dan for sharing the fix.
Reviewed-by: Vaibhav Agarwal vaibhav.sr@gmail.com
On 05-02-20, 15:32, Dan Carpenter wrote:
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: c77f85bbc91a ("greybus: audio: Fix incorrect counting of 'ida'") Signed-off-by: Dan Carpenter dan.carpenter@oracle.com
drivers/staging/greybus/audio_manager.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/staging/greybus/audio_manager.c b/drivers/staging/greybus/audio_manager.c index 9b19ea9d3fa1..9a3f7c034ab4 100644 --- a/drivers/staging/greybus/audio_manager.c +++ b/drivers/staging/greybus/audio_manager.c @@ -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);
kobject_put(&module->kobj);is_empty = list_empty(&modules_list);
Acked-by: Viresh Kumar viresh.kumar@linaro.org
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Dan Carpenter -
Vaibhav Agarwal -
Viresh Kumar