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Taehee Yoo 360cc79d9d netfilter: nf_tables: fix NULL-ptr in nf_tables_dump_obj() 
The table field in nft_obj_filter is not an array. In order to check
tablename, we should check if the pointer is set.

Test commands:

   %nft add table ip filter
   %nft add counter ip filter ct1
   %nft reset counters

Splat looks like:

[  306.510504] kasan: CONFIG_KASAN_INLINE enabled
[  306.516184] kasan: GPF could be caused by NULL-ptr deref or user memory access
[  306.524775] general protection fault: 0000 [#1] SMP DEBUG_PAGEALLOC KASAN PTI
[  306.528284] Modules linked in: nft_objref nft_counter nf_tables nfnetlink ip_tables x_tables
[  306.528284] CPU: 0 PID: 1488 Comm: nft Not tainted 4.17.0-rc4+ #17
[  306.528284] Hardware name: To be filled by O.E.M. To be filled by O.E.M./Aptio CRB, BIOS 5.6.5 07/08/2015
[  306.528284] RIP: 0010:nf_tables_dump_obj+0x52c/0xa70 [nf_tables]
[  306.528284] RSP: 0018:ffff8800b6cb7520 EFLAGS: 00010246
[  306.528284] RAX: 0000000000000000 RBX: ffff8800b6c49820 RCX: 0000000000000000
[  306.528284] RDX: 0000000000000000 RSI: dffffc0000000000 RDI: ffffed0016d96e9a
[  306.528284] RBP: ffff8800b6cb75c0 R08: ffffed00236fce7c R09: ffffed00236fce7b
[  306.528284] R10: ffffffff9f6241e8 R11: ffffed00236fce7c R12: ffff880111365108
[  306.528284] R13: 0000000000000000 R14: ffff8800b6c49860 R15: ffff8800b6c49860
[  306.528284] FS:  00007f838b007700(0000) GS:ffff88011b600000(0000) knlGS:0000000000000000
[  306.528284] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  306.528284] CR2: 00007ffeafabcf78 CR3: 00000000b6cbe000 CR4: 00000000001006f0
[  306.528284] Call Trace:
[  306.528284]  netlink_dump+0x470/0xa20
[  306.528284]  __netlink_dump_start+0x5ae/0x690
[  306.528284]  ? nf_tables_getobj+0x1b3/0x740 [nf_tables]
[  306.528284]  nf_tables_getobj+0x2f5/0x740 [nf_tables]
[  306.528284]  ? nft_obj_notify+0x100/0x100 [nf_tables]
[  306.528284]  ? nf_tables_getobj+0x740/0x740 [nf_tables]
[  306.528284]  ? nf_tables_dump_flowtable_done+0x70/0x70 [nf_tables]
[  306.528284]  ? nft_obj_notify+0x100/0x100 [nf_tables]
[  306.528284]  nfnetlink_rcv_msg+0x8ff/0x932 [nfnetlink]
[  306.528284]  ? nfnetlink_rcv_msg+0x216/0x932 [nfnetlink]
[  306.528284]  netlink_rcv_skb+0x1c9/0x2f0
[  306.528284]  ? nfnetlink_bind+0x1d0/0x1d0 [nfnetlink]
[  306.528284]  ? debug_check_no_locks_freed+0x270/0x270
[  306.528284]  ? netlink_ack+0x7a0/0x7a0
[  306.528284]  ? ns_capable_common+0x6e/0x110
[ ... ]

Fixes: e46abbcc05 ("netfilter: nf_tables: Allow table names of up to 255 chars")
Signed-off-by: Taehee Yoo <ap420073@gmail.com>
Acked-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2018-05-29 00:14:58 +02:00
arch Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2018-05-11 14:14:46 -07:00
block blk-mq: fix sysfs inflight counter 2018-04-26 09:02:01 -06:00
certs certs/blacklist_nohashes.c: fix const confusion in certs blacklist 2018-02-21 15:35:43 -08:00
crypto crypto: drbg - set freed buffers to NULL 2018-04-21 00:57:00 +08:00
Documentation net: phy: micrel: add 125MHz reference clock workaround 2018-05-16 12:20:03 -04:00
drivers tuntap: fix use after free during release 2018-05-16 14:53:10 -04:00
firmware kbuild: remove all dummy assignments to obj- 2017-11-18 11:46:06 +09:00
fs ceph: fix iov_iter issues in ceph_direct_read_write() 2018-05-10 10:15:12 +02:00
include net/mlx5: Fix build break when CONFIG_SMP=n 2018-05-16 12:16:45 -04:00
init Fix typo in comment. 2018-05-07 05:41:46 -10:00
ipc ipc/shm: fix use-after-free of shm file via remap_file_pages() 2018-04-13 17:10:27 -07:00
kernel Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2018-05-11 14:14:46 -07:00
lib swiotlb: fix inversed DMA_ATTR_NO_WARN test 2018-05-02 14:48:55 +02:00
LICENSES LICENSES: Add MPL-1.1 license 2018-01-06 10:59:44 -07:00
mm mmap: introduce sane default mmap limits 2018-05-11 09:52:01 -07:00
net netfilter: nf_tables: fix NULL-ptr in nf_tables_dump_obj() 2018-05-29 00:14:58 +02:00
samples bpf: sockmap sample use clang flag, -target bpf 2018-04-23 23:42:21 +02:00
scripts DeviceTree fixes for 4.17: 2018-05-07 05:33:29 -10:00
security Merge branch 'userns-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace 2018-04-24 17:58:51 -07:00
sound ALSA: pcm: Check PCM state at xfern compat ioctl 2018-05-02 08:54:54 +02:00
tools Merge git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf 2018-05-13 21:07:02 -04:00
usr kbuild: rename built-in.o to built-in.a 2018-03-26 02:01:19 +09:00
virt KVM/arm fixes for 4.17, take #2 2018-05-05 23:05:31 +02:00
.clang-format clang-format: add configuration file 2018-04-11 10:28:35 -07:00
.cocciconfig scripts: add Linux .cocciconfig for coccinelle 2016-07-22 12:13:39 +02:00
.get_maintainer.ignore
.gitattributes .gitattributes: set git diff driver for C source code files 2016-10-07 18:46:30 -07:00
.gitignore Kbuild updates for v4.17 (2nd) 2018-04-15 17:21:30 -07:00
.mailmap Merge candidates for 4.17 merge window 2018-04-06 17:35:43 -07:00
COPYING COPYING: use the new text with points to the license files 2018-03-23 12:41:45 -06:00
CREDITS MAINTAINERS/CREDITS: Drop METAG ARCHITECTURE 2018-03-05 16:34:24 +00:00
Kbuild Kbuild updates for v4.15 2017-11-17 17:45:29 -08:00
Kconfig License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
MAINTAINERS Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2018-05-11 14:14:46 -07:00
Makefile Linux 4.17-rc4 2018-05-06 16:57:38 -10:00
README Docs: Added a pointer to the formatted docs to README 2018-03-21 09:02:53 -06:00

README 

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
See Documentation/00-INDEX for a list of what is contained in each file.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.