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Hoang Le 56e8947bcf tipc: fix NULL deref in tipc_link_xmit() 
[ Upstream commit b77413446408fdd256599daf00d5be72b5f3e7c6 ]

The buffer list can have zero skb as following path:
tipc_named_node_up()->tipc_node_xmit()->tipc_link_xmit(), so
we need to check the list before casting an &sk_buff.

Fault report:
 [] tipc: Bulk publication failure
 [] general protection fault, probably for non-canonical [#1] PREEMPT [...]
 [] KASAN: null-ptr-deref in range [0x00000000000000c8-0x00000000000000cf]
 [] CPU: 0 PID: 0 Comm: swapper/0 Kdump: loaded Not tainted 5.10.0-rc4+ #2
 [] Hardware name: Bochs ..., BIOS Bochs 01/01/2011
 [] RIP: 0010:tipc_link_xmit+0xc1/0x2180
 [] Code: 24 b8 00 00 00 00 4d 39 ec 4c 0f 44 e8 e8 d7 0a 10 f9 48 [...]
 [] RSP: 0018:ffffc90000006ea0 EFLAGS: 00010202
 [] RAX: dffffc0000000000 RBX: ffff8880224da000 RCX: 1ffff11003d3cc0d
 [] RDX: 0000000000000019 RSI: ffffffff886007b9 RDI: 00000000000000c8
 [] RBP: ffffc90000007018 R08: 0000000000000001 R09: fffff52000000ded
 [] R10: 0000000000000003 R11: fffff52000000dec R12: ffffc90000007148
 [] R13: 0000000000000000 R14: 0000000000000000 R15: ffffc90000007018
 [] FS:  0000000000000000(0000) GS:ffff888037400000(0000) knlGS:000[...]
 [] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
 [] CR2: 00007fffd2db5000 CR3: 000000002b08f000 CR4: 00000000000006f0

Fixes: af9b028e27 ("tipc: make media xmit call outside node spinlock context")
Acked-by: Jon Maloy <jmaloy@redhat.com>
Signed-off-by: Hoang Le <hoang.h.le@dektech.com.au>
Link: https://lore.kernel.org/r/20210108071337.3598-1-hoang.h.le@dektech.com.au
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 		2021-01-23 15:58:00 +01:00
..
Kconfig
…
Makefile
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addr.c
…
addr.h
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bcast.c
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bcast.h
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bearer.c
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bearer.h
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core.c tipc: fix a deadlock when flushing scheduled work 2020-12-11 13:23:32 +01:00
core.h tipc: fix a deadlock when flushing scheduled work 2020-12-11 13:23:32 +01:00
diag.c
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discover.c
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discover.h
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eth_media.c
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group.c tipc: Fix memory leak in tipc_group_create_member() 2020-09-26 18:03:13 +02:00
group.h
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ib_media.c
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link.c tipc: fix NULL deref in tipc_link_xmit() 2021-01-23 15:58:00 +01:00
link.h
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monitor.c tipc: update mon's self addr when node addr generated 2020-01-26 10:01:00 +01:00
monitor.h tipc: update mon's self addr when node addr generated 2020-01-26 10:01:00 +01:00
msg.c tipc: fix memory leak caused by tipc_buf_append() 2020-11-01 12:01:04 +01:00
msg.h
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name_distr.c
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name_distr.h
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name_table.c
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name_table.h
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net.c tipc: fix a deadlock when flushing scheduled work 2020-12-11 13:23:32 +01:00
net.h tipc: fix a deadlock when flushing scheduled work 2020-12-11 13:23:32 +01:00
netlink.c tipc: add missing attribute validation for MTU property 2020-03-18 07:17:45 +01:00
netlink.h
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netlink_compat.c tipc: fix uninit skb->data in tipc_nl_compat_dumpit() 2020-09-03 11:26:40 +02:00
node.c
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node.h
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socket.c tipc: fix link overflow issue at socket shutdown 2020-10-01 13:17:24 +02:00
socket.h
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subscr.c
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subscr.h
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sysctl.c
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topsrv.c tipc: fix memory leak in tipc_topsrv_start() 2020-11-18 19:20:33 +01:00
topsrv.h
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trace.c
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trace.h
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udp_media.c tipc: block BH before using dst_cache 2020-06-03 08:21:03 +02:00
udp_media.h
…