[PATCH 3.19.y-ckt 009/102] RDS: verify the underlying transport exists before creating a connection

From	Kamal Mostafa <kamal@canonical.com>
Newsgroups	linux.kernel
Subject	[PATCH 3.19.y-ckt 009/102] RDS: verify the underlying transport exists before creating a connection
Date	2015-09-22 20:40 +0200
Message-ID	<qbADU-561-47@gated-at.bofh.it> (permalink)
References	<qbA1c-46k-3@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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3.19.8-ckt7 -stable review patch.  If anyone has any objections, please let me know.

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

From: Sasha Levin <sasha.levin@oracle.com>

commit 74e98eb085889b0d2d4908f59f6e00026063014f upstream.

There was no verification that an underlying transport exists when creating
a connection, this would cause dereferencing a NULL ptr.

It might happen on sockets that weren't properly bound before attempting to
send a message, which will cause a NULL ptr deref:

[135546.047719] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP DEBUG_PAGEALLOC KASAN
[135546.051270] Modules linked in:
[135546.051781] CPU: 4 PID: 15650 Comm: trinity-c4 Not tainted 4.2.0-next-20150902-sasha-00041-gbaa1222-dirty #2527
[135546.053217] task: ffff8800835bc000 ti: ffff8800bc708000 task.ti: ffff8800bc708000
[135546.054291] RIP: __rds_conn_create (net/rds/connection.c:194)
[135546.055666] RSP: 0018:ffff8800bc70fab0  EFLAGS: 00010202
[135546.056457] RAX: dffffc0000000000 RBX: 0000000000000f2c RCX: ffff8800835bc000
[135546.057494] RDX: 0000000000000007 RSI: ffff8800835bccd8 RDI: 0000000000000038
[135546.058530] RBP: ffff8800bc70fb18 R08: 0000000000000001 R09: 0000000000000000
[135546.059556] R10: ffffed014d7a3a23 R11: ffffed014d7a3a21 R12: 0000000000000000
[135546.060614] R13: 0000000000000001 R14: ffff8801ec3d0000 R15: 0000000000000000
[135546.061668] FS:  00007faad4ffb700(0000) GS:ffff880252000000(0000) knlGS:0000000000000000
[135546.062836] CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[135546.063682] CR2: 000000000000846a CR3: 000000009d137000 CR4: 00000000000006a0
[135546.064723] Stack:
[135546.065048]  ffffffffafe2055c ffffffffafe23fc1 ffffed00493097bf ffff8801ec3d0008
[135546.066247]  0000000000000000 00000000000000d0 0000000000000000 ac194a24c0586342
[135546.067438]  1ffff100178e1f78 ffff880320581b00 ffff8800bc70fdd0 ffff880320581b00
[135546.068629] Call Trace:
[135546.069028] ? __rds_conn_create (include/linux/rcupdate.h:856 net/rds/connection.c:134)
[135546.069989] ? rds_message_copy_from_user (net/rds/message.c:298)
[135546.071021] rds_conn_create_outgoing (net/rds/connection.c:278)
[135546.071981] rds_sendmsg (net/rds/send.c:1058)
[135546.072858] ? perf_trace_lock (include/trace/events/lock.h:38)
[135546.073744] ? lockdep_init (kernel/locking/lockdep.c:3298)
[135546.074577] ? rds_send_drop_to (net/rds/send.c:976)
[135546.075508] ? __might_fault (./arch/x86/include/asm/current.h:14 mm/memory.c:3795)
[135546.076349] ? __might_fault (mm/memory.c:3795)
[135546.077179] ? rds_send_drop_to (net/rds/send.c:976)
[135546.078114] sock_sendmsg (net/socket.c:611 net/socket.c:620)
[135546.078856] SYSC_sendto (net/socket.c:1657)
[135546.079596] ? SYSC_connect (net/socket.c:1628)
[135546.080510] ? trace_dump_stack (kernel/trace/trace.c:1926)
[135546.081397] ? ring_buffer_unlock_commit (kernel/trace/ring_buffer.c:2479 kernel/trace/ring_buffer.c:2558 kernel/trace/ring_buffer.c:2674)
[135546.082390] ? trace_buffer_unlock_commit (kernel/trace/trace.c:1749)
[135546.083410] ? trace_event_raw_event_sys_enter (include/trace/events/syscalls.h:16)
[135546.084481] ? do_audit_syscall_entry (include/trace/events/syscalls.h:16)
[135546.085438] ? trace_buffer_unlock_commit (kernel/trace/trace.c:1749)
[135546.085515] rds_ib_laddr_check(): addr 36.74.25.172 ret -99 node type -1

Acked-by: Santosh Shilimkar <santosh.shilimkar@oracle.com>
Signed-off-by: Sasha Levin <sasha.levin@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
---
 net/rds/connection.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/net/rds/connection.c b/net/rds/connection.c
index 378c3a6..f5fb7d6 100644
--- a/net/rds/connection.c
+++ b/net/rds/connection.c
@@ -183,6 +183,12 @@ static struct rds_connection *__rds_conn_create(__be32 laddr, __be32 faddr,
 		}
 	}
 
+	if (trans == NULL) {
+		kmem_cache_free(rds_conn_slab, conn);
+		conn = ERR_PTR(-ENODEV);
+		goto out;
+	}
+
 	conn->c_trans = trans;
 
 	ret = trans->conn_alloc(conn, gfp);
-- 
1.9.1

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  [PATCH 3.19.y-ckt 016/102] usb: chipidea: ehci_init_driver is intended to call one time Kamal Mostafa <kamal@canonical.com> - 2015-09-22 20:30 +0200
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  [PATCH 3.19.y-ckt 032/102] MIPS: do_mcheck: Fix kernel code dump with EVA Kamal Mostafa <kamal@canonical.com> - 2015-09-22 20:30 +0200
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  [PATCH 3.19.y-ckt 022/102] usb: gadget: f_uac2: fix calculation of uac2->p_interval Kamal Mostafa <kamal@canonical.com> - 2015-09-22 20:30 +0200
  [PATCH 3.19.y-ckt 024/102] USB: sierra: add 1199:68AB device ID Kamal Mostafa <kamal@canonical.com> - 2015-09-22 20:30 +0200
  [PATCH 3.19.y-ckt 029/102] target: REPORT LUNS should return LUN 0 even for dynamic ACLs Kamal Mostafa <kamal@canonical.com> - 2015-09-22 20:30 +0200
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  [PATCH 3.19.y-ckt 043/102] drm/dp-mst: Remove debug WARN_ON Kamal Mostafa <kamal@canonical.com> - 2015-09-22 20:30 +0200
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  [PATCH 3.19.y-ckt 034/102] MIPS: Export get_c0_perfcount_int() Kamal Mostafa <kamal@canonical.com> - 2015-09-22 20:30 +0200
  [PATCH 3.19.y-ckt 023/102] hwrng: core - correct error check of kthread_run call Kamal Mostafa <kamal@canonical.com> - 2015-09-22 20:30 +0200
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  [PATCH 3.19.y-ckt 008/102] virtio-net: drop NETIF_F_FRAGLIST Kamal Mostafa <kamal@canonical.com> - 2015-09-22 20:40 +0200
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  [PATCH 3.19.y-ckt 009/102] RDS: verify the underlying transport exists before creating a connection Kamal Mostafa <kamal@canonical.com> - 2015-09-22 20:40 +0200
  [PATCH 3.19.y-ckt 005/102] md: flush ->event_work before stopping array. Kamal Mostafa <kamal@canonical.com> - 2015-09-22 20:40 +0200
  [PATCH 3.19.y-ckt 012/102] PCI: Restore PCI_MSIX_FLAGS_BIRMASK definition Kamal Mostafa <kamal@canonical.com> - 2015-09-22 20:40 +0200
  [PATCH 3.19.y-ckt 011/102] xen/gntdevt: Fix race condition in gntdev_release() Kamal Mostafa <kamal@canonical.com> - 2015-09-22 20:40 +0200
  [PATCH 3.19.y-ckt 010/102] xen/gntdev: convert priv->lock to a mutex Kamal Mostafa <kamal@canonical.com> - 2015-09-22 20:40 +0200
  [PATCH 3.19.y-ckt 020/102] xen-blkfront: don't add indirect pages to list when !feature_persistent Kamal Mostafa <kamal@canonical.com> - 2015-09-22 20:40 +0200

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