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| author | Xin Long <lucien.xin@gmail.com> | 2016-12-15 18:00:55 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2016-12-17 19:43:23 +0300 |
| commit | 5cb2cd68ddf9a13af36cec633006c0f2bdfb300a (patch) | |
| tree | 1f33fd5c6275bae24cd7f03b8f5a6bb8766e6c6f /net | |
| parent | 10a3ecf49b681af49bf1b4f3fcf00115059a0ac6 (diff) | |
| download | linux-5cb2cd68ddf9a13af36cec633006c0f2bdfb300a.tar.xz | |
sctp: sctp_epaddr_lookup_transport should be protected by rcu_read_lock
Since commit 7fda702f9315 ("sctp: use new rhlist interface on sctp transport
rhashtable"), sctp has changed to use rhlist_lookup to look up transport, but
rhlist_lookup doesn't call rcu_read_lock inside, unlike rhashtable_lookup_fast.
It is called in sctp_epaddr_lookup_transport and sctp_addrs_lookup_transport.
sctp_addrs_lookup_transport is always in the protection of rcu_read_lock(),
as __sctp_lookup_association is called in rx path or sctp_lookup_association
which are in the protection of rcu_read_lock() already.
But sctp_epaddr_lookup_transport is called by sctp_endpoint_lookup_assoc, it
doesn't call rcu_read_lock, which may cause "suspicious rcu_dereference_check
usage' in __rhashtable_lookup.
This patch is to fix it by adding rcu_read_lock in sctp_endpoint_lookup_assoc
before calling sctp_epaddr_lookup_transport.
Fixes: 7fda702f9315 ("sctp: use new rhlist interface on sctp transport rhashtable")
Reported-by: Dmitry Vyukov <dvyukov@google.com>
Signed-off-by: Xin Long <lucien.xin@gmail.com>
Acked-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
| -rw-r--r-- | net/sctp/endpointola.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/net/sctp/endpointola.c b/net/sctp/endpointola.c index 1f03065686fe..410ddc1e3443 100644 --- a/net/sctp/endpointola.c +++ b/net/sctp/endpointola.c @@ -331,7 +331,9 @@ struct sctp_association *sctp_endpoint_lookup_assoc( * on this endpoint. */ if (!ep->base.bind_addr.port) - goto out; + return NULL; + + rcu_read_lock(); t = sctp_epaddr_lookup_transport(ep, paddr); if (!t) goto out; @@ -339,6 +341,7 @@ struct sctp_association *sctp_endpoint_lookup_assoc( *transport = t; asoc = t->asoc; out: + rcu_read_unlock(); return asoc; } |