On Sat, Nov 25, 2017 at 02:29:36AM +0100, ishraq.i.ashraf@xxxxxxxxx wrote: > + > + ret = 0; > + Sorry, I wasn't clear before. When I said don't initialize "ret" to zero, I just meant that in that specific case we initialized "ret" and then immediately reassigned it with: ret = some_function(); if (ret) return ret; In this case it's fine to set "ret = 0" at the start so that we don't have to do it later. > + if (copy_to_user(wrqu->data.pointer, param, wrqu->data.length)) > + ret = -EFAULT; > + > + if (pwep) > + goto err_free_pwep_param; > + > + err_free_param: > + kfree(param); > + return ret; > + > + err_free_pwep_param: > + kfree(pwep); > + kfree(param); > + return ret; > +} Hm... I said before that it's better to keep the error paths and success path separate but in this case it's probabaly simpler to merge them. This one could look like this: if (copy_to_user(wrqu->data.pointer, param, wrqu->data.length)) ret = -EFAULT; free_pwep: kfree(pwep); free_param: kfree(param); return ret; There is no need for the if (pwep) conditions, because kfree() can take a NULL pointer. Some people would just use one label but I hate that. It looks like this: free: kfree(pwep); kfree(param); return ret; The reason, I hate it is because I don't like freeing things which have not been allocated yet. If you do it the normal kernel way then you just have to keep track of the most recently allocated thing. regards, dan carpenter _______________________________________________ devel mailing list devel@xxxxxxxxxxxxxxxxxxxxxx http://driverdev.linuxdriverproject.org/mailman/listinfo/driverdev-devel
