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Bluetooth: RFCOMM - Fix missing msg_namelen update in rfcomm_sock_rec…


If RFCOMM_DEFER_SETUP is set in the flags, rfcomm_sock_recvmsg() returns
early with 0 without updating the possibly set msg_namelen member. This,
in turn, leads to a 128 byte kernel stack leak in net/socket.c.

Fix this by updating msg_namelen in this case. For all other cases it
will be handled in bt_sock_stream_recvmsg().

Cc: Marcel Holtmann <>
Cc: Gustavo Padovan <>
Cc: Johan Hedberg <>
Signed-off-by: Mathias Krause <>
Signed-off-by: David S. Miller <>
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1 parent 4683f42 commit e11e0455c0d7d3d62276a0c55d9dfbc16779d691 @minipli minipli committed with davem330 Apr 7, 2013
Showing with 1 addition and 0 deletions.
  1. +1 −0 net/bluetooth/rfcomm/sock.c
1 net/bluetooth/rfcomm/sock.c
@@ -608,6 +608,7 @@ static int rfcomm_sock_recvmsg(struct kiocb *iocb, struct socket *sock,
if (test_and_clear_bit(RFCOMM_DEFER_SETUP, &d->flags)) {
+ msg->msg_namelen = 0;
return 0;

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