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Avinash Repaka 9e630bcb77 RDS: RDMA: Fix the NULL-ptr deref in rds_ib_get_mr 
Registration of a memory region(MR) through FRMR/fastreg(unlike FMR)
needs a connection/qp. With a proxy qp, this dependency on connection
will be removed, but that needs more infrastructure patches, which is a
work in progress.

As an intermediate fix, the get_mr returns EOPNOTSUPP when connection
details are not populated. The MR registration through sendmsg() will
continue to work even with fast registration, since connection in this
case is formed upfront.

This patch fixes the following crash:
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] SMP KASAN
Modules linked in:
CPU: 1 PID: 4244 Comm: syzkaller468044 Not tainted 4.16.0-rc6+ #361
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
RIP: 0010:rds_ib_get_mr+0x5c/0x230 net/rds/ib_rdma.c:544
RSP: 0018:ffff8801b059f890 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: ffff8801b07e1300 RCX: ffffffff8562d96e
RDX: 000000000000000d RSI: 0000000000000001 RDI: 0000000000000068
RBP: ffff8801b059f8b8 R08: ffffed0036274244 R09: ffff8801b13a1200
R10: 0000000000000004 R11: ffffed0036274243 R12: ffff8801b13a1200
R13: 0000000000000001 R14: ffff8801ca09fa9c R15: 0000000000000000
FS:  00007f4d050af700(0000) GS:ffff8801db300000(0000)
knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f4d050aee78 CR3: 00000001b0d9b006 CR4: 00000000001606e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 __rds_rdma_map+0x710/0x1050 net/rds/rdma.c:271
 rds_get_mr_for_dest+0x1d4/0x2c0 net/rds/rdma.c:357
 rds_setsockopt+0x6cc/0x980 net/rds/af_rds.c:347
 SYSC_setsockopt net/socket.c:1849 [inline]
 SyS_setsockopt+0x189/0x360 net/socket.c:1828
 do_syscall_64+0x281/0x940 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x4456d9
RSP: 002b:00007f4d050aedb8 EFLAGS: 00000246 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 00000000006dac3c RCX: 00000000004456d9
RDX: 0000000000000007 RSI: 0000000000000114 RDI: 0000000000000004
RBP: 00000000006dac38 R08: 00000000000000a0 R09: 0000000000000000
R10: 0000000020000380 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fffbfb36d6f R14: 00007f4d050af9c0 R15: 0000000000000005
Code: fa 48 c1 ea 03 80 3c 02 00 0f 85 cc 01 00 00 4c 8b bb 80 04 00 00
48
b8 00 00 00 00 00 fc ff df 49 8d 7f 68 48 89 fa 48 c1 ea 03 <80> 3c 02
00 0f
85 9c 01 00 00 4d 8b 7f 68 48 b8 00 00 00 00 00
RIP: rds_ib_get_mr+0x5c/0x230 net/rds/ib_rdma.c:544 RSP:
ffff8801b059f890
---[ end trace 7e1cea13b85473b0 ]---

Reported-by: syzbot+b51c77ef956678a65834@syzkaller.appspotmail.com
Signed-off-by: Santosh Shilimkar <santosh.shilimkar@oracle.com>
Signed-off-by: Avinash Repaka <avinash.repaka@oracle.com>

Signed-off-by: David S. Miller <davem@davemloft.net>
 		2018-07-26 14:03:07 -07:00
..
Kconfig IB: Revert "remove redundant INFINIBAND kconfig dependencies" 2018-05-28 10:40:16 -06:00
Makefile License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
af_rds.c rds: use list structure to track information for zerocopy completion notification 2018-03-07 18:05:57 -05:00
bind.c rds; Reset rs->rs_bound_addr in rds_add_bound() failure path 2017-12-27 13:37:27 -05:00
cong.c rds: tcp: use rds_destroy_pending() to synchronize netns/module teardown and rds connection/workq management 2018-02-08 15:23:52 -05:00
connection.c rds: clean up loopback rds_connections on netns deletion 2018-06-27 10:11:03 +09:00
ib.c treewide: kzalloc() -> kcalloc() 2018-06-12 16:19:22 -07:00
ib.h Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2017-11-04 09:26:51 +09:00
ib_cm.c treewide: Use array_size() in vzalloc_node() 2018-06-12 16:19:22 -07:00
ib_fmr.c net/rds/ib_fmr.c: use kmalloc_array_node() 2017-11-15 18:21:02 -08:00
ib_frmr.c RDS: RDMA: Fix the NULL-ptr deref in rds_ib_get_mr 2018-07-26 14:03:07 -07:00
ib_mr.h RDS: RDMA: Fix the NULL-ptr deref in rds_ib_get_mr 2018-07-26 14:03:07 -07:00
ib_rdma.c RDS: RDMA: Fix the NULL-ptr deref in rds_ib_get_mr 2018-07-26 14:03:07 -07:00
ib_recv.c rds: ib: Fix NULL pointer dereference in debug code 2017-11-10 14:54:47 +09:00
ib_ring.c
…
ib_send.c rds: Fix inaccurate accounting of unsignaled wrs 2017-10-26 17:35:57 +09:00
ib_stats.c RDS: IB: add few useful cache stasts 2017-01-02 14:02:51 -08:00
ib_sysctl.c
…
info.c treewide: kmalloc() -> kmalloc_array() 2018-06-12 16:19:22 -07:00
info.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
loop.c rds: clean up loopback rds_connections on netns deletion 2018-06-27 10:11:03 +09:00
loop.h rds: clean up loopback rds_connections on netns deletion 2018-06-27 10:11:03 +09:00
message.c rds: remove redundant variable 'sg_off' 2018-03-12 11:12:38 -04:00
page.c rds: remove dead code 2016-12-26 21:35:39 -05:00
rdma.c RDS: RDMA: Fix the NULL-ptr deref in rds_ib_get_mr 2018-07-26 14:03:07 -07:00
rdma_transport.c RDS: RDMA: start rdma listening after init 2017-01-02 14:02:45 -08:00
rdma_transport.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
rds.h RDS: RDMA: Fix the NULL-ptr deref in rds_ib_get_mr 2018-07-26 14:03:07 -07:00
rds_single_path.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
recv.c rds: avoid unenecessary cong_update in loop transport 2018-06-14 19:01:49 -07:00
send.c RDS: RDMA: Fix the NULL-ptr deref in rds_ib_get_mr 2018-07-26 14:03:07 -07:00
stats.c
…
sysctl.c net: rds: fix coding style issues 2016-06-18 21:34:09 -07:00
tcp.c net: Drop pernet_operations::async 2018-03-27 13:18:09 -04:00
tcp.h Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2018-01-23 13:51:56 -05:00
tcp_connect.c rds: tcp: use rds_destroy_pending() to synchronize netns/module teardown and rds connection/workq management 2018-02-08 15:23:52 -05:00
tcp_listen.c rds: Incorrect reference counting in TCP socket creation 2018-03-02 09:40:27 -05:00
tcp_recv.c rds: tcp: use rds_destroy_pending() to synchronize netns/module teardown and rds connection/workq management 2018-02-08 15:23:52 -05:00
tcp_send.c rds: tcp: use rds_destroy_pending() to synchronize netns/module teardown and rds connection/workq management 2018-02-08 15:23:52 -05:00
tcp_stats.c
…
threads.c rds: tcp: use rds_destroy_pending() to synchronize netns/module teardown and rds connection/workq management 2018-02-08 15:23:52 -05:00
transport.c rds: remove unnecessary returned value check 2017-03-03 09:51:22 -08:00