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linux/net/tipc
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Shigeru Yoshida 3871aa01e1 tipc: Check the bearer type before calling tipc_udp_nl_bearer_add() 
syzbot reported the following general protection fault [1]:

general protection fault, probably for non-canonical address 0xdffffc0000000010: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000080-0x0000000000000087]
...
RIP: 0010:tipc_udp_is_known_peer+0x9c/0x250 net/tipc/udp_media.c:291
...
Call Trace:
 <TASK>
 tipc_udp_nl_bearer_add+0x212/0x2f0 net/tipc/udp_media.c:646
 tipc_nl_bearer_add+0x21e/0x360 net/tipc/bearer.c:1089
 genl_family_rcv_msg_doit+0x1fc/0x2e0 net/netlink/genetlink.c:972
 genl_family_rcv_msg net/netlink/genetlink.c:1052 [inline]
 genl_rcv_msg+0x561/0x800 net/netlink/genetlink.c:1067
 netlink_rcv_skb+0x16b/0x440 net/netlink/af_netlink.c:2544
 genl_rcv+0x28/0x40 net/netlink/genetlink.c:1076
 netlink_unicast_kernel net/netlink/af_netlink.c:1341 [inline]
 netlink_unicast+0x53b/0x810 net/netlink/af_netlink.c:1367
 netlink_sendmsg+0x8b7/0xd70 net/netlink/af_netlink.c:1909
 sock_sendmsg_nosec net/socket.c:730 [inline]
 __sock_sendmsg+0xd5/0x180 net/socket.c:745
 ____sys_sendmsg+0x6ac/0x940 net/socket.c:2584
 ___sys_sendmsg+0x135/0x1d0 net/socket.c:2638
 __sys_sendmsg+0x117/0x1e0 net/socket.c:2667
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0x40/0x110 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

The cause of this issue is that when tipc_nl_bearer_add() is called with
the TIPC_NLA_BEARER_UDP_OPTS attribute, tipc_udp_nl_bearer_add() is called
even if the bearer is not UDP.

tipc_udp_is_known_peer() called by tipc_udp_nl_bearer_add() assumes that
the media_ptr field of the tipc_bearer has an udp_bearer type object, so
the function goes crazy for non-UDP bearers.

This patch fixes the issue by checking the bearer type before calling
tipc_udp_nl_bearer_add() in tipc_nl_bearer_add().

Fixes: ef20cd4dd1 ("tipc: introduce UDP replicast")
Reported-and-tested-by: syzbot+5142b87a9abc510e14fa@syzkaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?extid=5142b87a9abc510e14fa [1]
Signed-off-by: Shigeru Yoshida <syoshida@redhat.com>
Reviewed-by: Tung Nguyen <tung.q.nguyen@dektech.com.au>
Link: https://lore.kernel.org/r/20240131152310.4089541-1-syoshida@redhat.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
2024-02-06 08:49:26 +01:00
..
addr.c tipc: introduce new unified address type for internal use 2021-03-17 11:51:04 -07:00
addr.h tipc: Remove unused function declarations 2023-08-03 12:51:45 +02:00
bcast.c net: tipc: fix FB_MTU eat two pages 2021-06-28 13:31:57 -07:00
bcast.h
bearer.c tipc: Check the bearer type before calling tipc_udp_nl_bearer_add() 2024-02-06 08:49:26 +01:00
bearer.h tipc: Remove unused function declarations 2023-08-03 12:51:45 +02:00
core.c tipc: fix use-after-free Read in tipc_named_reinit 2022-06-17 11:39:10 +01:00
core.h minmax: add in_range() macro 2023-08-24 16:20:18 -07:00
crypto.c tipc: fix a potential deadlock on &tx->lock 2023-10-04 13:24:12 -07:00
crypto.h
diag.c net: fill in MODULE_DESCRIPTION()s for SOCK_DIAG modules 2023-11-19 20:09:13 +00:00
discover.c treewide: Convert del_timer*() to timer_shutdown*() 2022-12-25 13:38:09 -08:00
discover.h
eth_media.c tipc: constify dev_addr passing 2021-10-13 09:40:46 -07:00
group.c
group.h
ib_media.c tipc: constify dev_addr passing 2021-10-13 09:40:46 -07:00
Kconfig
link.c tipc: Remove some excess struct member documentation 2023-12-22 23:14:43 +00:00
link.h tipc: Remove unused declaration tipc_link_build_bc_sync_msg() 2023-08-09 13:03:14 -07:00
Makefile
monitor.c treewide: Convert del_timer*() to timer_shutdown*() 2022-12-25 13:38:09 -08:00
monitor.h
msg.c net: tipc: replace align() with ALIGN in msg.c 2021-06-28 13:31:57 -07:00
msg.h net: tipc: remove unused static inlines 2022-01-27 13:53:27 +00:00
name_distr.c net/tipc: Remove unused struct distr_queue_item 2022-09-29 18:48:32 -07:00
name_distr.h tipc: Remove unused function declarations 2023-08-03 12:51:45 +02:00
name_table.c tipc: cleanup unused function 2022-06-17 11:43:57 +01:00
name_table.h tipc: cleanup unused function 2022-06-17 11:43:57 +01:00
net.c tipc: simplify the finalize work queue 2021-05-18 13:22:09 -07:00
net.h tipc: Remove unused function declarations 2023-08-03 12:51:45 +02:00
netlink_compat.c tipc: Remove redundant call to TLV_SPACE() 2023-11-17 02:27:27 +00:00
netlink.c tipc: Change nla_policy for bearer-related names to NLA_NUL_STRING 2023-11-01 22:26:37 -07:00
netlink.h
node.c genetlink: use attrs from struct genl_info 2023-08-15 15:00:45 -07:00
node.h
socket.c genetlink: use attrs from struct genl_info 2023-08-15 15:00:45 -07:00
socket.h
subscr.c tipc:subscr.c: fix a spelling mistake 2021-06-10 13:48:43 -07:00
subscr.h tipc: fix htmldoc and smatch warnings 2021-03-29 16:28:50 -07:00
sysctl.c
topsrv.c net/sock: Introduce trace_sk_data_ready() 2023-01-23 11:26:50 +00:00
topsrv.h
trace.c net/tipc: fix various kernel-doc warnings 2020-12-01 15:37:46 -08:00
trace.h
udp_media.c genetlink: use attrs from struct genl_info 2023-08-15 15:00:45 -07:00
udp_media.h