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linux/drivers/usb/gadget
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Andrew Gabbasov 3941ee2083 usb: gadget: composite: Fix use-after-free in usb_composite_overwrite_options 
commit aec17e1e24 upstream.

KASAN enabled configuration reports an error

    BUG: KASAN: use-after-free in usb_composite_overwrite_options+...
                [libcomposite] at addr ...
    Read of size 1 by task ...

when some driver is un-bound and then bound again.
For example, this happens with FunctionFS driver when "ffs-test"
test application is run several times in a row.

If the driver has empty manufacturer ID string in initial static data,
it is then replaced with generated string. After driver unbinding
the generated string is freed, but the driver data still keep that
pointer. And if the driver is then bound again, that pointer
is re-used for string emptiness check.

The fix is to clean up the driver string data upon its unbinding
to drop the pointer to freed memory.

Fixes: cc2683c318 ("usb: gadget: Provide a default implementation of default manufacturer string")
Signed-off-by: Andrew Gabbasov <andrew_gabbasov@mentor.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
History 2017-10-18 09:35:40 +02:00
..
function usb: gadget: configfs: Fix memory leak of interface directory data 2017-10-18 09:35:40 +02:00
legacy USB: g_mass_storage: Fix deadlock when driver is unbound 2017-10-12 11:51:17 +02:00
udc USB: dummy-hcd: Fix deadlock caused by disconnect detection 2017-10-18 09:35:38 +02:00
composite.c usb: gadget: composite: Fix use-after-free in usb_composite_overwrite_options 2017-10-18 09:35:40 +02:00
config.c usb: Use (foo *) instead of (foo*). 2016-06-21 11:16:15 +03:00
configfs.c usb: gadget: configfs: Fix memory leak of interface directory data 2017-10-18 09:35:40 +02:00
configfs.h usb: gadget: configfs: Fix memory leak of interface directory data 2017-10-18 09:35:40 +02:00
epautoconf.c usb: gadget: epautoconf: add usb_ep_autoconfig_release() function 2015-09-27 10:54:31 -05:00
functions.c usb: gadget: add a forward pointer from usb_function to its "instance" 2013-01-21 20:52:46 +02:00
Kconfig usb: gadget: legacy gadgets are optional 2017-05-20 14:28:35 +02:00
Makefile usb: gadget: use $(srctree) instead of $(PWD) for includes 2014-08-29 15:53:46 -05:00
u_f.c usb: gadget: remove useless parameter in alloc_ep_req() 2016-08-25 12:13:19 +03:00
u_f.h usb: gadget: remove useless parameter in alloc_ep_req() 2016-08-25 12:13:19 +03:00
u_os_desc.h usb: gadget: u_os_desc: helper functions for accessing ext prop buffer 2014-07-10 08:36:51 -05:00
usbstring.c usb: delete non-required instances of include <linux/init.h> 2014-01-08 15:01:39 -08:00