linux/net/netfilter
Florian Westphal b60a77386b net: make skb_dst_force return true when dst is refcounted
netfilter did not expect that skb_dst_force() can cause skb to lose its
dst entry.

I got a bug report with a skb->dst NULL dereference in netfilter
output path.  The backtrace contains nf_reinject(), so the dst might have
been cleared when skb got queued to userspace.

Other users were fixed via
if (skb_dst(skb)) {
	skb_dst_force(skb);
	if (!skb_dst(skb))
		goto handle_err;
}

But I think its preferable to make the 'dst might be cleared' part
of the function explicit.

In netfilter case, skb with a null dst is expected when queueing in
prerouting hook, so drop skb for the other hooks.

v2:
 v1 of this patch returned true in case skb had no dst entry.
 Eric said:
   Say if we have two skb_dst_force() calls for some reason
   on the same skb, only the first one will return false.

 This now returns false even when skb had no dst, as per Erics
 suggestion, so callers might need to check skb_dst() first before
 skb_dst_force().

Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
2019-06-29 11:01:35 -07:00
..
ipset treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
ipvs Merge git://git.kernel.org/pub/scm/linux/kernel/git/pablo/nf 2019-06-28 13:36:43 -07:00
core.c net: replace CONFIG_DEBUG_KERNEL with CONFIG_DEBUG_MISC 2019-05-14 19:52:50 -07:00
Kconfig treewide: Add SPDX license identifier - Makefile/Kconfig 2019-05-21 10:50:46 +02:00
Makefile netfilter: x_tables: merge ip and ipv6 masquerade modules 2019-04-11 20:59:29 +02:00
nf_conncount.c treewide: Add SPDX license identifier for more missed files 2019-05-21 10:50:45 +02:00
nf_conntrack_acct.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
nf_conntrack_amanda.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
nf_conntrack_broadcast.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
nf_conntrack_core.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
nf_conntrack_ecache.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
nf_conntrack_expect.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
nf_conntrack_extend.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
nf_conntrack_ftp.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
nf_conntrack_h323_asn1.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 230 2019-06-19 17:09:06 +02:00
nf_conntrack_h323_main.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 484 2019-06-19 17:09:52 +02:00
nf_conntrack_h323_types.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 484 2019-06-19 17:09:52 +02:00
nf_conntrack_helper.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
nf_conntrack_irc.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
nf_conntrack_labels.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
nf_conntrack_netbios_ns.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
nf_conntrack_netlink.c netfilter: ctnetlink: Fix regression in conntrack entry deletion 2019-06-26 11:07:50 +02:00
nf_conntrack_pptp.c treewide: Add SPDX license identifier for more missed files 2019-05-21 10:50:45 +02:00
nf_conntrack_proto_dccp.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
nf_conntrack_proto_generic.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
nf_conntrack_proto_gre.c treewide: Add SPDX license identifier for missed files 2019-05-21 10:50:45 +02:00
nf_conntrack_proto_icmp.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/pablo/nf 2019-06-28 13:36:43 -07:00
nf_conntrack_proto_icmpv6.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
nf_conntrack_proto_sctp.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
nf_conntrack_proto_tcp.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
nf_conntrack_proto_udp.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
nf_conntrack_proto.c netfilter: fix nf_l4proto_log_invalid to log invalid packets 2019-04-22 10:38:50 +02:00
nf_conntrack_sane.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
nf_conntrack_seqadj.c treewide: Add SPDX license identifier for missed files 2019-05-21 10:50:45 +02:00
nf_conntrack_sip.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
nf_conntrack_snmp.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
nf_conntrack_standalone.c netfilter: conntrack: limit sysctl setting for boolean options 2019-04-30 14:18:56 +02:00
nf_conntrack_tftp.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
nf_conntrack_timeout.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 77 2019-05-24 17:37:51 +02:00
nf_conntrack_timestamp.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 77 2019-05-24 17:37:51 +02:00
nf_dup_netdev.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
nf_flow_table_core.c treewide: Add SPDX license identifier for more missed files 2019-05-21 10:50:45 +02:00
nf_flow_table_inet.c treewide: Add SPDX license identifier for more missed files 2019-05-21 10:50:45 +02:00
nf_flow_table_ip.c ipv6: constify rt6_nexthop() 2019-06-26 13:26:08 -07:00
nf_internals.h bridge: netfilter: unroll NF_HOOK helper in bridge input path 2019-04-12 01:47:39 +02:00
nf_log_common.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
nf_log_netdev.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
nf_log.c treewide: Add SPDX license identifier for missed files 2019-05-21 10:50:45 +02:00
nf_nat_amanda.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
nf_nat_core.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
nf_nat_ftp.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
nf_nat_helper.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
nf_nat_irc.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
nf_nat_masquerade.c netfilter: nf_nat_masquerade: unify ipv4/6 notifier registration 2019-04-11 20:59:34 +02:00
nf_nat_proto.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/pablo/nf 2019-06-28 13:36:43 -07:00
nf_nat_redirect.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
nf_nat_sip.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
nf_nat_tftp.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
nf_queue.c net: make skb_dst_force return true when dst is refcounted 2019-06-29 11:01:35 -07:00
nf_sockopt.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
nf_synproxy_core.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
nf_tables_api.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
nf_tables_core.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
nf_tables_set_core.c netfilter: nf_tables: fix implicit include of module.h 2019-04-30 13:35:26 +02:00
nf_tables_trace.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
nfnetlink_acct.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 77 2019-05-24 17:37:51 +02:00
nfnetlink_cthelper.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 77 2019-05-24 17:37:51 +02:00
nfnetlink_cttimeout.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 77 2019-05-24 17:37:51 +02:00
nfnetlink_log.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
nfnetlink_osf.c treewide: Add SPDX license identifier for more missed files 2019-05-21 10:50:45 +02:00
nfnetlink_queue.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
nfnetlink.c netlink: make validation more configurable for future strictness 2019-04-27 17:07:21 -04:00
nft_bitwise.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
nft_byteorder.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
nft_chain_filter.c netfilter: nf_tables: don't prevent event handler from device cleanup on netns exit 2018-08-16 19:37:03 +02:00
nft_chain_nat.c netfilter: nat: add inet family nat support 2019-04-08 23:01:39 +02:00
nft_chain_route.c netfilter: nf_tables: merge route type into core 2019-04-08 23:01:42 +02:00
nft_cmp.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
nft_compat.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
nft_connlimit.c netfilter: nf_conncount: merge lookup and add functions 2018-12-29 02:45:20 +01:00
nft_counter.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
nft_ct.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
nft_dup_netdev.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
nft_dynset.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
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nft_fib_inet.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
nft_fib_netdev.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
nft_fib.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
nft_flow_offload.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/pablo/nf 2019-05-23 14:45:36 -07:00
nft_fwd_netdev.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
nft_hash.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
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nft_limit.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
nft_log.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
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nft_masq.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2019-06-21 22:23:35 -07:00
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nft_payload.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
nft_queue.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
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nft_range.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
nft_redir.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2019-06-21 22:23:35 -07:00
nft_reject_inet.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
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nft_set_rbtree.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
nft_socket.c netfilter: nft_socket: Expose socket mark 2018-07-18 11:26:52 +02:00
nft_tproxy.c netfilter: nft_tproxy: Fix missing-braces warning 2018-08-16 19:37:10 +02:00
nft_tunnel.c netlink: make validation more configurable for future strictness 2019-04-27 17:07:21 -04:00
nft_xfrm.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
utils.c netfilter: Fix remainder of pseudo-header protocol 0 2019-06-28 19:30:50 +02:00
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xt_connbytes.c netfilter: x_tables: use pr ratelimiting in all remaining spots 2018-02-14 21:05:38 +01:00
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xt_connlimit.c netfilter: use PTR_ERR_OR_ZERO() 2018-07-30 14:07:09 +02:00
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