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driver core: bus: Fix double free in driver API bus_register()

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commit bfa54a793ba77ef696755b66f3ac4ed00c7d1248 upstream.

For bus_register(), any error which happens after kset_register() will
cause that @priv are freed twice, fixed by setting @priv with NULL after
the first free.

Signed-off-by: Zijun Hu <quic_zijuhu@quicinc.com>
Link: https://lore.kernel.org/r/20240727-bus_register_fix-v1-1-fed8dd0dba7a@quicinc.com
[ hagar : required setting bus->p with NULL instead of priv]
Signed-off-by: Hagar Hemdan <hagarhem@amazon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Zijun Hu 2024-07-27 16:34:01 +08:00 • committed by Greg Kroah-Hartman
commit 87bc3cb23c
1 changed files with 2 additions and 0 deletions
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2
drivers/base/bus.c
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@ -873,6 +873,8 @@ bus_devices_fail:
bus_remove_file(bus, &bus_attr_uevent);
bus_uevent_fail:
kset_unregister(&bus->p->subsys);
/* Above kset_unregister() will kfree @bus->p */
bus->p = NULL;
out:
kfree(bus->p);
bus->p = NULL;