Em Tue, Dec 17, 2013 at 09:02:36AM +0900, Namhyung Kim escreveu: > On Mon, 16 Dec 2013 09:40:51 -0300, Arnaldo Carvalho de Melo wrote: > > Em Mon, Dec 16, 2013 at 01:49:11PM +0900, Namhyung Kim escreveu: > >> On Fri, 13 Dec 2013 11:52:04 -0300, Arnaldo Carvalho de Melo wrote: > >> > All the rest is ok, so its just the malloc + strcpy that remains to be > >> > converted, do you want me to do it?
> >> Hmm.. did you mean like this? > >> str = NULL; > >> if (val) > >> asprintf(&str, "TRUE"); > >> else > >> asprintf(&str, "FALSE"); > >> return str; > > More compact: > > if (asprintf(&str, "%s", val ? "TRUE" : "FALSE") < 0) > > // error handling path > > At that point str already is set to NULL. > Okay, this is a new one: Thanks, it all seems now, but just prior to applying this I noticed: > Those functions are for stringify filter arguments. As caller of > those functions handles NULL string properly, it seems that it's > enough to return NULL rather than calling die(). It handles NULL in what way? This comment: > @@ -2369,7 +2340,7 @@ static char *arg_to_str(struct event_filter *filter, > struct filter_arg *arg) > * Returns a string that displays the filter contents. > * This string must be freed with free(str). > - * NULL is returned if no filter is found. > + * NULL is returned if no filter is found or allocation failed. > */ > char * > pevent_filter_make_string(struct event_filter *filter, int event_id) Made me a bit unconfortable, so if it handles NULL as a filter not found, how will it figure out what happened? /me looks at the callers... >From just a quick look I couldn't see cases where NULL could cause segfaults, but saw some cases where allocation errors would not be notified in any way to the user :-\ Anyway, applying this patch, those are other kinds of problems, i.e. further fallout from converting from the previous panic()-at-alloc-failure approach. - Arnaldo -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
