On Tue, 2015-02-24 at 18:34 +0300, Dan Carpenter wrote: > If we call groups_alloc() with invalid values then it's might lead to > memory corruption. For example, with a negative value then we might not > allocate enough for sizeof(struct group_info). > > Signed-off-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx> > --- > v2: In v1, I changed groups_alloc(). The other places which call > groups_alloc() check the value before calling. Eric wanted that, either > have all the callers check, or all the callers rely on groups_alloc(). > In the end, Bruce Fields said adding the check here was probably > reasonable. > > diff --git a/net/sunrpc/auth_gss/svcauth_gss.c b/net/sunrpc/auth_gss/svcauth_gss.c > index 224a82f..1095be9 100644 > --- a/net/sunrpc/auth_gss/svcauth_gss.c > +++ b/net/sunrpc/auth_gss/svcauth_gss.c > @@ -463,6 +463,8 @@ static int rsc_parse(struct cache_detail *cd, > /* number of additional gid's */ > if (get_int(&mesg, &N)) > goto out; > + if (N < 0 || N > NGROUPS_MAX) > + goto out; > status = -ENOMEM; > rsci.cred.cr_group_info = groups_alloc(N); > if (rsci.cred.cr_group_info == NULL) > -- > To unsubscribe from this list: send the line "unsubscribe linux-nfs" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html I touched this code relatively recently, and this check looks correct. Feel free to add Reviewed-by: Simo Sorce <simo@xxxxxxxxxx> Simo. -- Simo Sorce * Red Hat, Inc * New York -- To unsubscribe from this list: send the line "unsubscribe linux-nfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
