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pptp: fix stack info leak in pptp_getname()
pptp_getname() only partially initializes the stack variable sa, particularly only fills the pptp part of the sa_addr union. The code thereby discloses 16 bytes of kernel stack memory via getsockname(). Fix this by memset(0)'ing the union before. Cc: Dmitry Kozlov <xeb@mail.ru> Signed-off-by: Mathias Krause <minipli@googlemail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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1 changed files with 3 additions and 1 deletions
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@ -506,6 +506,8 @@ static int pptp_getname(struct socket *sock, struct sockaddr *uaddr,
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int len = sizeof(struct sockaddr_pppox);
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struct sockaddr_pppox sp;
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memset(&sp.sa_addr, 0, sizeof(sp.sa_addr));
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sp.sa_family = AF_PPPOX;
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sp.sa_protocol = PX_PROTO_PPTP;
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sp.sa_addr.pptp = pppox_sk(sock->sk)->proto.pptp.src_addr;
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