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Subject[PATCH] ipv6: Use memset_after() to zero rt6_info
Date
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>
---
net/ipv6/route.c | 4 +---
1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index 3ae25b8ffbd6..0cf616b2d013 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -328,9 +328,7 @@ static const struct rt6_info ip6_blk_hole_entry_template = {

static void rt6_info_init(struct rt6_info *rt)
{
- struct dst_entry *dst = &rt->dst;
-
- memset(dst + 1, 0, sizeof(*rt) - sizeof(*dst));
+ memset_after(rt, 0, dst);
INIT_LIST_HEAD(&rt->rt6i_uncached);
}

--
2.30.2
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