AuxXxilium/linux_dsm_epyc7002
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linux_dsm_epyc7002/net/tipc
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Hoang Le 60b8b4e631 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 16:04:00 +01:00
..
addr.c
addr.h
bcast.c tipc: fix incorrect setting window for bcast link 2020-10-16 14:09:12 -07:00
bcast.h tipc: update a binding service via broadcast 2020-06-17 08:53:34 -07:00
bearer.c treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
bearer.h
core.c tipc: fix a deadlock when flushing scheduled work 2020-09-07 12:08:53 -07:00
core.h tipc: fix a deadlock when flushing scheduled work 2020-09-07 12:08:53 -07:00
crypto.c mm: remove kzfree() compatibility definition 2020-10-25 11:39:02 -07:00
crypto.h tipc: add automatic rekeying for encryption key 2020-09-18 13:58:37 -07:00
diag.c
discover.c net: tipc: kerneldoc fixes 2020-07-13 17:20:40 -07:00
discover.h
eth_media.c tipc: Use is_broadcast_ether_addr() instead of memcmp() 2020-08-03 16:21:46 -07:00
group.c tipc: Fix memory leak in tipc_group_create_member() 2020-09-14 16:36:20 -07:00
group.h
ib_media.c
Kconfig tipc: not enable tipc when ipv6 works as a module 2020-08-16 21:04:55 -07:00
link.c tipc: fix NULL deref in tipc_link_xmit() 2021-01-23 16:04:00 +01:00
link.h tipc: add support for broadcast rcv stats dumping 2020-05-26 15:16:52 -07:00
Makefile tipc: remove meaningless assignment in Makefile 2020-01-08 12:38:54 -08:00
monitor.c tipc: add NULL pointer check to prevent kernel oops 2020-03-15 00:07:00 -07:00
monitor.h
msg.c tipc: fix memory leak caused by tipc_buf_append() 2020-10-29 09:51:52 -07:00
msg.h tipc: add automatic session key exchange 2020-09-18 13:58:37 -07:00
name_distr.c tipc: fix NULL pointer dereference in tipc_named_rcv 2020-10-09 18:29:06 -07:00
name_distr.h tipc: update a binding service via broadcast 2020-06-17 08:53:34 -07:00
name_table.c tipc: update a binding service via broadcast 2020-06-17 08:53:34 -07:00
name_table.h tipc: update a binding service via broadcast 2020-06-17 08:53:34 -07:00
net.c tipc: fix a deadlock when flushing scheduled work 2020-09-07 12:08:53 -07:00
net.h tipc: fix a deadlock when flushing scheduled work 2020-09-07 12:08:53 -07:00
netlink_compat.c genetlink: move to smaller ops wherever possible 2020-10-02 19:11:11 -07:00
netlink.c tipc: add automatic rekeying for encryption key 2020-09-18 13:58:37 -07:00
netlink.h
node.c net: tipc: prevent possible null deref of link 2020-12-08 15:53:41 -08:00
node.h tipc: add automatic session key exchange 2020-09-18 13:58:37 -07:00
socket.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2020-09-22 16:45:34 -07:00
socket.h tipc: call tsk_set_importance from tipc_topsrv_create_listener 2020-05-28 11:11:46 -07:00
subscr.c
subscr.h tipc: fix failed service subscription deletion 2020-05-13 12:33:19 -07:00
sysctl.c tipc: add automatic session key exchange 2020-09-18 13:58:37 -07:00
topsrv.c tipc: fix memory leak in tipc_topsrv_start() 2020-11-11 14:39:23 -08:00
topsrv.h
trace.c
trace.h tipc: add support for broadcast rcv stats dumping 2020-05-26 15:16:52 -07:00
udp_media.c net: tipc: Supply missing udp_media.h include file 2020-09-18 14:56:44 -07:00
udp_media.h