scm: fix scm_fp_list->list initialization made in wrong place

This is the next page of the scm recursion story (the commit
f8d570a4 net: Fix recursive descent in __scm_destroy()).

In function scm_fp_dup(), the INIT_LIST_HEAD(&fpl->list) of newly
created fpl is done *before* the subsequent memcpy from the old
structure and thus the freshly initialized list is overwritten.

But that's OK, since this initialization is not required at all,
since the fpl->list is list_add-ed at the destruction time in any
case (and is unused in other code), so I propose to drop both
initializations, rather than moving it after the memcpy.

Please, correct me if I miss something significant.

Signed-off-by: Pavel Emelyanov <xemul@openvz.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/core/scm.c b/net/core/scm.c
index ab242cc..b12303d 100644 (file)
--- a/net/core/scm.c
+++ b/net/core/scm.c
@@ -75,7 +75,6 @@ static int scm_fp_copy(struct cmsghdr *cmsg, struct scm_fp_list **fplp)
                if (!fpl)
                        return -ENOMEM;
                *fplp = fpl;
-               INIT_LIST_HEAD(&fpl->list);
                fpl->count = 0;
        }
        fpp = &fpl->fp[fpl->count];
@@ -301,7 +300,6 @@ struct scm_fp_list *scm_fp_dup(struct scm_fp_list *fpl)
 
        new_fpl = kmalloc(sizeof(*fpl), GFP_KERNEL);
        if (new_fpl) {
-               INIT_LIST_HEAD(&new_fpl->list);
                for (i=fpl->count-1; i>=0; i--)
                        get_file(fpl->fp[i]);
                memcpy(new_fpl, fpl, sizeof(*fpl));