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ipv6: Use memset_after() to zero rt6_info

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In preparation for FORTIFY_SOURCE performing compile-time and run-time
field bounds checking for memset(), avoid intentionally writing across
neighboring fields.

Use memset_after() to clear everything after the dst_entry member of
struct rt6_info.

Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Kees Cook 2021-11-18 12:32:41 -08:00 committed by David S. Miller
parent e3617433c3
commit 8f2a83b454
1 changed files with 1 additions and 3 deletions
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4
net/ipv6/route.c
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@ -328,9 +328,7 @@ static const struct rt6_info ip6_blk_hole_entry_template = {
static void rt6_info_init(struct rt6_info *rt) static void rt6_info_init(struct rt6_info *rt)
{ {
struct dst_entry *dst = &rt->dst; memset_after(rt, 0, dst);
memset(dst + 1, 0, sizeof(*rt) - sizeof(*dst));
INIT_LIST_HEAD(&rt->rt6i_uncached); INIT_LIST_HEAD(&rt->rt6i_uncached);
} }