ipv4: initialize flowi4_flags before calling fib_lookup() (4cfc86f3) · Commits · 戴 / test

Field fl4.flowi4_flags is not initialized in fib_compute_spec_dst() before calling fib_lookup(), which means fib_table_lookup() is using non-deterministic data at this line: if (!(flp->flowi4_flags & FLOWI_FLAG_SKIP_NH_OIF)) { Fix by initializing the entire fl4 structure, which will prevent similar issues as fields are added in the future by ensuring that all fields are initialized to zero unless explicitly initialized to another value. Fixes: ("net: Fix vti use case with oif in dst lookups") Suggested-by:

David Ahern <dsa@cumulusnetworks.com> Signed-off-by:

Lance Richardson <lrichard@redhat.com> Acked-by:

David Ahern <dsa@cumulusnetworks.com> Signed-off-by:

David S. Miller <davem@davemloft.net>

net/ipv4/fib_frontend.c

+7 −9

Original line number	Diff line number	Diff line
		@@ -280,7 +280,6 @@ __be32 fib_compute_spec_dst(struct sk_buff *skb)
		struct in_device *in_dev;
		struct fib_result res;
		struct rtable *rt;
		struct flowi4 fl4;
		struct net *net;
		int scope;

		@@ -296,14 +295,13 @@ __be32 fib_compute_spec_dst(struct sk_buff *skb)

		scope = RT_SCOPE_UNIVERSE;
		if (!ipv4_is_zeronet(ip_hdr(skb)->saddr)) {
		fl4.flowi4_oif = 0;
		fl4.flowi4_iif = LOOPBACK_IFINDEX;
		fl4.daddr = ip_hdr(skb)->saddr;
		fl4.saddr = 0;
		fl4.flowi4_tos = RT_TOS(ip_hdr(skb)->tos);
		fl4.flowi4_scope = scope;
		fl4.flowi4_mark = IN_DEV_SRC_VMARK(in_dev) ? skb->mark : 0;
		fl4.flowi4_tun_key.tun_id = 0;
		struct flowi4 fl4 = {
		.flowi4_iif = LOOPBACK_IFINDEX,
		.daddr = ip_hdr(skb)->saddr,
		.flowi4_tos = RT_TOS(ip_hdr(skb)->tos),
		.flowi4_scope = scope,
		.flowi4_mark = IN_DEV_SRC_VMARK(in_dev) ? skb->mark : 0,
		};
		if (!fib_lookup(net, &fl4, &res, 0))
		return FIB_RES_PREFSRC(net, res);
		} else {

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