The patch titled sctp: prevent reading out-of-bounds memory has been added to the -mm tree. Its filename is sctp-prevent-reading-out-of-bounds-memory.patch Before you just go and hit "reply", please: a) Consider who else should be cc'ed b) Prefer to cc a suitable mailing list as well c) Ideally: find the original patch on the mailing list and do a reply-to-all to that, adding suitable additional cc's *** Remember to use Documentation/SubmitChecklist when testing your code *** See http://userweb.kernel.org/~akpm/stuff/added-to-mm.txt to find out what to do about this The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/ ------------------------------------------------------ Subject: sctp: prevent reading out-of-bounds memory From: Dan Rosenberg <dan.j.rosenberg@xxxxxxxxx> 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. Signed-off-by: Dan Rosenberg <dan.j.rosenberg@xxxxxxxxx> Acked-by: Vlad Yasevich <vladislav.yasevich@xxxxxx> Cc: David Miller <davem@xxxxxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- net/sctp/socket.c | 15 ++++++++++++++- 1 file changed, 14 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 +918,12 @@ 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 +1010,14 @@ 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 +1027,8 @@ 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); _ Patches currently in -mm which might be from dan.j.rosenberg@xxxxxxxxx are linux-next.patch sctp-prevent-reading-out-of-bounds-memory.patch sctp-prevent-reading-out-of-bounds-memory-cleanup.patch -- To unsubscribe from this list: send the line "unsubscribe mm-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html