diff options
| author | Mathias Krause <minipli@googlemail.com> | 2013-04-07 01:51:56 +0000 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-05-01 09:41:05 -0700 |
| commit | 40aea043862dd46aa865587223e084da2e3e37cf (patch) | |
| tree | 5bc92d84d808aa2eac326ded541424736f78bf3f /net | |
| parent | dbd99572c687037ca7ddb31df2d7fd364732c670 (diff) | |
llc: Fix missing msg_namelen update in llc_ui_recvmsg()
[ Upstream commit c77a4b9cffb6215a15196ec499490d116dfad181 ]
For stream sockets the code misses to update 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. The msg_namelen update is also missing for datagram sockets
in case the socket is shutting down during receive.
Fix both issues by setting msg_namelen to 0 early. It will be
updated later if we're going to fill the msg_name member.
Signed-off-by: Mathias Krause <minipli@googlemail.com>
Cc: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
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/llc/af_llc.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/net/llc/af_llc.c b/net/llc/af_llc.c index df08d7779e1..e4d2fbb59a7 100644 --- a/net/llc/af_llc.c +++ b/net/llc/af_llc.c @@ -721,6 +721,8 @@ static int llc_ui_recvmsg(struct kiocb *iocb, struct socket *sock, int target; /* Read at least this many bytes */ long timeo; + msg->msg_namelen = 0; + lock_sock(sk); copied = -ENOTCONN; if (unlikely(sk->sk_type == SOCK_STREAM && sk->sk_state == TCP_LISTEN)) |