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39884604b1
linux/net/mptcp
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Paolo Abeni 39884604b1 mptcp: fix NULL ptr dereference in MP_JOIN error path 
When token lookup on MP_JOIN 3rd ack fails, the server
socket closes with a reset the incoming child. Such socket
has the 'is_mptcp' flag set, but no msk socket associated
- due to the failed lookup.

While crafting the reset packet mptcp_established_options_mp()
will try to dereference the child's master socket, causing
a NULL ptr dereference.

This change addresses the issue with explicit fallback to
TCP in such error path.

Fixes: 729cd6436f ("mptcp: cope better with MP_JOIN failure")
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2020-05-30 21:54:03 -07:00
..
crypto.c mptcp: use untruncated hash in ADD_ADDR HMAC 2020-05-22 14:21:24 -07:00
ctrl.c mptcp: new sysctl to control the activation per NS 2020-01-24 13:44:08 +01:00
diag.c mptcp: allow dumping subflow context to userspace 2020-03-29 22:14:48 -07:00
Kconfig mptcp: select CRYPTO 2020-02-16 19:37:16 -08:00
Makefile mptcp: add netlink-based PM 2020-03-29 22:14:49 -07:00
mib.c mptcp: add and use MIB counter infrastructure 2020-03-29 22:14:49 -07:00
mib.h mptcp: add and use MIB counter infrastructure 2020-03-29 22:14:49 -07:00
options.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2020-05-24 13:47:27 -07:00
pm_netlink.c mptcp/pm_netlink.c : add check for nla_put_in/6_addr 2020-04-23 15:38:10 -07:00
pm.c mptcp: add some missing pr_fmt defines 2020-04-03 16:06:32 -07:00
protocol.c mptcp: attempt coalescing when moving skbs to mptcp rx queue 2020-05-26 20:29:32 -07:00
protocol.h Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2020-05-24 13:47:27 -07:00
subflow.c mptcp: fix NULL ptr dereference in MP_JOIN error path 2020-05-30 21:54:03 -07:00
token.c mptcp: fix "fn parameter not described" warnings 2020-04-02 06:59:21 -07:00