3.18-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Eric Dumazet <eduma...@google.com>


[ Upstream commit 81e98370293afcb58340ce8bd71af7b97f925c26 ]

Check must happen before call to ipv6_addr_v4mapped()

syzbot report was :

BUG: KMSAN: uninit-value in sctp_sockaddr_af net/sctp/socket.c:359 [inline]
BUG: KMSAN: uninit-value in sctp_do_bind+0x60f/0xdc0 net/sctp/socket.c:384
CPU: 0 PID: 3576 Comm: syzkaller968804 Not tainted 4.16.0+ #82
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 
01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x185/0x1d0 lib/dump_stack.c:53
 kmsan_report+0x142/0x240 mm/kmsan/kmsan.c:1067
 __msan_warning_32+0x6c/0xb0 mm/kmsan/kmsan_instr.c:676
 sctp_sockaddr_af net/sctp/socket.c:359 [inline]
 sctp_do_bind+0x60f/0xdc0 net/sctp/socket.c:384
 sctp_bind+0x149/0x190 net/sctp/socket.c:332
 inet6_bind+0x1fd/0x1820 net/ipv6/af_inet6.c:293
 SYSC_bind+0x3f2/0x4b0 net/socket.c:1474
 SyS_bind+0x54/0x80 net/socket.c:1460
 do_syscall_64+0x309/0x430 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x3d/0xa2
RIP: 0033:0x43fd49
RSP: 002b:00007ffe99df3d28 EFLAGS: 00000213 ORIG_RAX: 0000000000000031
RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fd49
RDX: 0000000000000010 RSI: 0000000020000000 RDI: 0000000000000003
RBP: 00000000006ca018 R08: 00000000004002c8 R09: 00000000004002c8
R10: 00000000004002c8 R11: 0000000000000213 R12: 0000000000401670
R13: 0000000000401700 R14: 0000000000000000 R15: 0000000000000000

Local variable description: ----address@SYSC_bind
Variable was created at:
 SYSC_bind+0x6f/0x4b0 net/socket.c:1461
 SyS_bind+0x54/0x80 net/socket.c:1460

Signed-off-by: Eric Dumazet <eduma...@google.com>
Cc: Vlad Yasevich <vyasev...@gmail.com>
Cc: Neil Horman <nhor...@tuxdriver.com>
Reported-by: syzbot <syzkal...@googlegroups.com>
Signed-off-by: David S. Miller <da...@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
 net/sctp/socket.c |   13 ++++++++-----
 1 file changed, 8 insertions(+), 5 deletions(-)

--- a/net/sctp/socket.c
+++ b/net/sctp/socket.c
@@ -336,11 +336,14 @@ static struct sctp_af *sctp_sockaddr_af(
        if (!opt->pf->af_supported(addr->sa.sa_family, opt))
                return NULL;
 
-       /* V4 mapped address are really of AF_INET family */
-       if (addr->sa.sa_family == AF_INET6 &&
-           ipv6_addr_v4mapped(&addr->v6.sin6_addr) &&
-           !opt->pf->af_supported(AF_INET, opt))
-               return NULL;
+       if (addr->sa.sa_family == AF_INET6) {
+               if (len < SIN6_LEN_RFC2133)
+                       return NULL;
+               /* V4 mapped address are really of AF_INET family */
+               if (ipv6_addr_v4mapped(&addr->v6.sin6_addr) &&
+                   !opt->pf->af_supported(AF_INET, opt))
+                       return NULL;
+       }
 
        /* If we get this far, af is valid. */
        af = sctp_get_af_specific(addr->sa.sa_family);


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