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usb: gadget: composite: Fix NULL pointer dereference 

commit f563d23090 ("usb: gadget: composite: add req_match method
to usb_function") accesses cdev->config even before set config
is invoked causing a NULL pointer dereferencing error while running
Lecroy Mass Storage Compliance test.

Fix it here by accessing cdev->config only if it is non NULL.

Fixes: commit f563d23090 ("usb: gadget: composite: add req_match
method to usb_function").

Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
This commit is contained in:
Kishon Vijay Abraham I 2015-06-11 22:12:11 +05:30 committed by Felipe Balbi
parent 4088acf1e8
commit b4c21f0bdd
1 changed files with 7 additions and 4 deletions
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11
drivers/usb/gadget/composite.c
View File

@ -1758,10 +1758,13 @@ unknown:
* take such requests too, if that's ever needed: to work
* in config 0, etc.
*/
list_for_each_entry(f, &cdev->config->functions, list)
if (f->req_match && f->req_match(f, ctrl))
goto try_fun_setup;
f = NULL;
if (cdev->config) {
list_for_each_entry(f, &cdev->config->functions, list)
if (f->req_match && f->req_match(f, ctrl))
goto try_fun_setup;
f = NULL;
}
switch (ctrl->bRequestType & USB_RECIP_MASK) {
case USB_RECIP_INTERFACE:
if (!cdev->config || intf >= MAX_CONFIG_INTERFACES)