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| author | Mathias Krause <minipli@googlemail.com> | 2013-04-07 01:51:53 +0000 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-05-01 09:41:05 -0700 |
| commit | d3dd6298cdf289b410c030f0d329020cffd85a1d (patch) | |
| tree | a1a797d7cb34156d1233b41bec10e8e50a495891 | |
| parent | 3300687d7ebb7a8abd9945843629b09194d97430 (diff) | |
| download | lwn-d3dd6298cdf289b410c030f0d329020cffd85a1d.tar.gz lwn-d3dd6298cdf289b410c030f0d329020cffd85a1d.zip | |
irda: Fix missing msg_namelen update in irda_recvmsg_dgram()
[ Upstream commit 5ae94c0d2f0bed41d6718be743985d61b7f5c47d ]
The current code does not fill the msg_name member in case it is set.
It also does not set the msg_namelen member to 0 and therefore makes
net/socket.c leak the local, uninitialized sockaddr_storage variable
to userland -- 128 bytes of kernel stack memory.
Fix that by simply setting msg_namelen to 0 as obviously nobody cared
about irda_recvmsg_dgram() not filling the msg_name in case it was
set.
Signed-off-by: Mathias Krause <minipli@googlemail.com>
Cc: Samuel Ortiz <samuel@sortiz.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | net/irda/af_irda.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/net/irda/af_irda.c b/net/irda/af_irda.c index d6c291c45e70..bd25678b1d50 100644 --- a/net/irda/af_irda.c +++ b/net/irda/af_irda.c @@ -1386,6 +1386,8 @@ static int irda_recvmsg_dgram(struct kiocb *iocb, struct socket *sock, IRDA_DEBUG(4, "%s()\n", __func__); + msg->msg_namelen = 0; + skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT, flags & MSG_DONTWAIT, &err); if (!skb) |