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authorPaolo Abeni <pabeni@redhat.com>2020-05-29 17:43:31 +0200
committerDavid S. Miller <davem@davemloft.net>2020-05-30 21:39:13 -0700
commitc5c79763fac115fe827ed6a18ed94fff2432f678 (patch)
tree3f1e30f2e51e151045ad9ca2e90f9af1c6c1bd7c
parent10f6d46c943d1ccd1d730d2e915226cbdeaad2d5 (diff)
mptcp: remove msk from the token container at destruction time.
Currently we remote the msk from the token container only via mptcp_close(). The MPTCP master socket can be destroyed also via other paths (e.g. if not yet accepted, when shutting down the listener socket). When we hit the latter scenario, dangling msk references are left into the token container, leading to memory corruption and/or UaF. This change addresses the issue by moving the token removal into the msk destructor. Fixes: 79c0949e9a09 ("mptcp: Add key generation and token tree") Signed-off-by: Paolo Abeni <pabeni@redhat.com> Reviewed-by: Mat Martineau <mathew.j.martineau@linux.intel.com> Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--net/mptcp/protocol.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/net/mptcp/protocol.c b/net/mptcp/protocol.c
index 35bdfb4f3eae..34dd0e278a82 100644
--- a/net/mptcp/protocol.c
+++ b/net/mptcp/protocol.c
@@ -1263,7 +1263,6 @@ static void mptcp_close(struct sock *sk, long timeout)
lock_sock(sk);
- mptcp_token_destroy(msk->token);
inet_sk_state_store(sk, TCP_CLOSE);
/* be sure to always acquire the join list lock, to sync vs
@@ -1461,6 +1460,7 @@ static void mptcp_destroy(struct sock *sk)
{
struct mptcp_sock *msk = mptcp_sk(sk);
+ mptcp_token_destroy(msk->token);
if (msk->cached_ext)
__skb_ext_put(msk->cached_ext);