From mboxrd@z Thu Jan 1 00:00:00 1970 From: akpm@linux-foundation.org Subject: [patch 1/1] sctp: prevent reading out-of-bounds memory Date: Fri, 01 Oct 2010 14:16:58 -0700 Message-ID: <201010012116.o91LGwS5021150@imap1.linux-foundation.org> Mime-Version: 1.0 Content-Type: text/plain; charset=ANSI_X3.4-1968 Content-Transfer-Encoding: 8bit Cc: netdev@vger.kernel.org, akpm@linux-foundation.org, dan.j.rosenberg@gmail.com, vladislav.yasevich@hp.com To: davem@davemloft.net Return-path: Received: from smtp1.linux-foundation.org ([140.211.169.13]:39355 "EHLO smtp1.linux-foundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754045Ab0JAVRc (ORCPT ); Fri, 1 Oct 2010 17:17:32 -0400 Sender: netdev-owner@vger.kernel.org List-ID: From: Dan Rosenberg Two user-controlled allocations in SCTP are subsequently dereferenced as sockaddr structs, without checking if the dereferenced struct members fall beyond the end of the allocated chunk. There doesn't appear to be any information leakage here based on how these members are used and additional checking, but it's still worth fixing. [akpm@linux-foundation.org: remove unfashionable newlines, fix gmail tab->space conversion] Signed-off-by: Dan Rosenberg Acked-by: Vlad Yasevich Cc: David Miller Signed-off-by: Andrew Morton --- net/sctp/socket.c | 13 ++++++++++++- 1 file changed, 12 insertions(+), 1 deletion(-) diff -puN net/sctp/socket.c~sctp-prevent-reading-out-of-bounds-memory net/sctp/socket.c --- a/net/sctp/socket.c~sctp-prevent-reading-out-of-bounds-memory +++ a/net/sctp/socket.c @@ -918,6 +918,11 @@ SCTP_STATIC int sctp_setsockopt_bindx(st /* Walk through the addrs buffer and count the number of addresses. */ addr_buf = kaddrs; while (walk_size < addrs_size) { + if (walk_size + sizeof(sa_family_t) > addrs_size) { + kfree(kaddrs); + return -EINVAL; + } + sa_addr = (struct sockaddr *)addr_buf; af = sctp_get_af_specific(sa_addr->sa_family); @@ -1004,9 +1009,13 @@ static int __sctp_connect(struct sock* s /* Walk through the addrs buffer and count the number of addresses. */ addr_buf = kaddrs; while (walk_size < addrs_size) { + if (walk_size + sizeof(sa_family_t) > addrs_size) { + err = -EINVAL; + goto out_free; + } + sa_addr = (union sctp_addr *)addr_buf; af = sctp_get_af_specific(sa_addr->sa.sa_family); - port = ntohs(sa_addr->v4.sin_port); /* If the address family is not supported or if this address * causes the address buffer to overflow return EINVAL. @@ -1016,6 +1025,8 @@ static int __sctp_connect(struct sock* s goto out_free; } + port = ntohs(sa_addr->v4.sin_port); + /* Save current address so we can work with it */ memcpy(&to, sa_addr, af->sockaddr_len); _