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authorMathias Krause <minipli@googlemail.com>2013-04-07 01:51:50 +0000
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2013-05-01 08:56:39 -0700
commitebffd4ef7c48ec51176e5214d344eddf7283fa35 (patch)
tree35e1f5835fa9d9bf82a53cc5095c69b3c0b7564b /net
parent0a740ea0de6c84544fe8e68d235da75341f30edd (diff)
Bluetooth: RFCOMM - Fix missing msg_namelen update in rfcomm_sock_recvmsg()
[ Upstream commit e11e0455c0d7d3d62276a0c55d9dfbc16779d691 ] 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(). Signed-off-by: Mathias Krause <minipli@googlemail.com> Cc: Marcel Holtmann <marcel@holtmann.org> Cc: Gustavo Padovan <gustavo@padovan.org> Cc: Johan Hedberg <johan.hedberg@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'net')
-rw-r--r--net/bluetooth/rfcomm/sock.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/net/bluetooth/rfcomm/sock.c b/net/bluetooth/rfcomm/sock.c
index 9dfe702ce11..bf6f8f588ba 100644
--- a/net/bluetooth/rfcomm/sock.c
+++ b/net/bluetooth/rfcomm/sock.c
@@ -624,6 +624,7 @@ static int rfcomm_sock_recvmsg(struct kiocb *iocb, struct socket *sock,
if (test_and_clear_bit(RFCOMM_DEFER_SETUP, &d->flags)) {
rfcomm_dlc_accept(d);
+ msg->msg_namelen = 0;
return 0;
}