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authorMarcelo Ricardo Leitner <marcelo.leitner@gmail.com>2016-11-03 17:03:41 -0200
committerDavid S. Miller <davem@davemloft.net>2016-11-07 13:18:37 -0500
commit7233bc84a3aeda835d334499dc00448373caf5c0 (patch)
tree80684f77226940c66a814c3ab55155fd9f87e845 /net/sctp/socket.c
parentee0475a5fc1a02115bf0df9207d4bb6c1abf7db1 (diff)
sctp: assign assoc_id earlier in __sctp_connect
sctp_wait_for_connect() currently already holds the asoc to keep it alive during the sleep, in case another thread release it. But Andrey Konovalov and Dmitry Vyukov reported an use-after-free in such situation. Problem is that __sctp_connect() doesn't get a ref on the asoc and will do a read on the asoc after calling sctp_wait_for_connect(), but by then another thread may have closed it and the _put on sctp_wait_for_connect will actually release it, causing the use-after-free. Fix is, instead of doing the read after waiting for the connect, do it before so, and avoid this issue as the socket is still locked by then. There should be no issue on returning the asoc id in case of failure as the application shouldn't trust on that number in such situations anyway. This issue doesn't exist in sctp_sendmsg() path. Reported-by: Dmitry Vyukov <dvyukov@google.com> Reported-by: Andrey Konovalov <andreyknvl@google.com> Tested-by: Andrey Konovalov <andreyknvl@google.com> Signed-off-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com> Reviewed-by: Xin Long <lucien.xin@gmail.com> Acked-by: Neil Horman <nhorman@tuxdriver.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/sctp/socket.c')
-rw-r--r--net/sctp/socket.c7
1 files changed, 5 insertions, 2 deletions
diff --git a/net/sctp/socket.c b/net/sctp/socket.c
index 71b75f9d9c1b..faa48ff5cf4b 100644
--- a/net/sctp/socket.c
+++ b/net/sctp/socket.c
@@ -1214,9 +1214,12 @@ static int __sctp_connect(struct sock *sk,
timeo = sock_sndtimeo(sk, f_flags & O_NONBLOCK);
- err = sctp_wait_for_connect(asoc, &timeo);
- if ((err == 0 || err == -EINPROGRESS) && assoc_id)
+ if (assoc_id)
*assoc_id = asoc->assoc_id;
+ err = sctp_wait_for_connect(asoc, &timeo);
+ /* Note: the asoc may be freed after the return of
+ * sctp_wait_for_connect.
+ */
/* Don't free association on exit. */
asoc = NULL;