diff options
Diffstat (limited to 'drivers/usb/gadget/g_ffs.c')
| -rw-r--r-- | drivers/usb/gadget/g_ffs.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/drivers/usb/gadget/g_ffs.c b/drivers/usb/gadget/g_ffs.c index 4b0e4a040d6..d1af253a910 100644 --- a/drivers/usb/gadget/g_ffs.c +++ b/drivers/usb/gadget/g_ffs.c @@ -392,6 +392,17 @@ static int __gfs_do_config(struct usb_configuration *c, if (unlikely(ret < 0)) return ret; + /* After previous do_configs there may be some invalid + * pointers in c->interface array. This happens every time + * a user space function with fewer interfaces than a user + * space function that was run before the new one is run. The + * compasit's set_config() assumes that if there is no more + * then MAX_CONFIG_INTERFACES interfaces in a configuration + * then there is a NULL pointer after the last interface in + * c->interface array. We need to make sure this is true. */ + if (c->next_interface_id < ARRAY_SIZE(c->interface)) + c->interface[c->next_interface_id] = NULL; + return 0; } |