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Eric Dumazet c0af24b263 net: hsr: fix possible NULL deref in hsr_handle_frame() [ Upstream commit `2b5b8251bc` ] hsr_port_get_rcu() can return NULL, so we need to be careful. general protection fault, probably for non-canonical address 0xdffffc0000000006: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000030-0x0000000000000037] CPU: 1 PID: 10249 Comm: syz-executor.5 Not tainted 5.5.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__read_once_size include/linux/compiler.h:199 [inline] RIP: 0010:hsr_addr_is_self+0x86/0x330 net/hsr/hsr_framereg.c:44 Code: 04 00 f3 f3 f3 65 48 8b 04 25 28 00 00 00 48 89 45 d0 31 c0 e8 6b ff 94 f9 4c 89 f2 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 <80> 3c 02 00 0f 85 75 02 00 00 48 8b 43 30 49 39 c6 49 89 47 c0 0f RSP: 0018:ffffc90000da8a90 EFLAGS: 00010206 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffffff87e0cc33 RDX: 0000000000000006 RSI: ffffffff87e035d5 RDI: 0000000000000000 RBP: ffffc90000da8b20 R08: ffff88808e7de040 R09: ffffed1015d2707c R10: ffffed1015d2707b R11: ffff8880ae9383db R12: ffff8880a689bc5e R13: 1ffff920001b5153 R14: 0000000000000030 R15: ffffc90000da8af8 FS: 00007fd7a42be700(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b32338000 CR3: 00000000a928c000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <IRQ> hsr_handle_frame+0x1c5/0x630 net/hsr/hsr_slave.c:31 __netif_receive_skb_core+0xfbc/0x30b0 net/core/dev.c:5099 __netif_receive_skb_one_core+0xa8/0x1a0 net/core/dev.c:5196 __netif_receive_skb+0x2c/0x1d0 net/core/dev.c:5312 process_backlog+0x206/0x750 net/core/dev.c:6144 napi_poll net/core/dev.c:6582 [inline] net_rx_action+0x508/0x1120 net/core/dev.c:6650 __do_softirq+0x262/0x98c kernel/softirq.c:292 do_softirq_own_stack+0x2a/0x40 arch/x86/entry/entry_64.S:1082 </IRQ> Fixes: `c5a7591172` ("net/hsr: Use list_head (and rcu) instead of array for slave devices.") Signed-off-by: Eric Dumazet <edumazet@google.com> Reported-by: syzbot <syzkaller@googlegroups.com> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		History 2020-02-11 04:36:35 -08:00
arch	sparc32: fix struct ipc64_perm type definition	2020-02-11 04:36:34 -08:00
block	block: allow partitions on host aware zone devices	2020-01-26 09:59:08 -07:00
certs	certs: Add wrapper function to check blacklisted binary hash	2019-11-12 12:25:50 +11:00
crypto	crypto: pcrypt - Fix user-after-free on module unload	2020-02-01 09:33:00 +00:00
Documentation	PM / devfreq: Add new name attribute for sysfs	2020-02-04 18:18:01 +00:00
drivers	gtp: use __GFP_NOWARN to avoid memalloc warning	2020-02-11 04:36:35 -08:00
fs	btrfs: do not zero f_bavail if we have available space	2020-02-04 18:18:03 +00:00
include	udp: segment looped gso packets correctly	2020-02-01 09:32:58 +00:00
init	Revert "um: Enable CONFIG_CONSTRUCTORS"	2020-02-01 09:33:00 +00:00
ipc	treewide: Use sizeof_field() macro	2019-12-09 10:36:44 -08:00
kernel	cgroup: Prevent double killing of css when enabling threaded cgroup	2020-02-04 18:18:03 +00:00
lib	lib/test_bitmap: correct test data offsets for 32-bit	2020-02-04 18:18:01 +00:00
LICENSES	LICENSES: Rename other to deprecated	2019-05-03 06:34:32 -06:00
mm	mm/mempolicy.c: fix out of bounds write in mpol_parse_str()	2020-02-04 18:18:01 +00:00
net	net: hsr: fix possible NULL deref in hsr_handle_frame()	2020-02-11 04:36:35 -08:00
samples	samples/seccomp: Zero out members based on seccomp_notif_sizes	2020-01-02 13:03:39 -08:00
scripts	ARM fixes for 5.5:	2020-01-25 14:32:51 -08:00
security	tomoyo: Use atomic_t for statistics counter	2020-02-04 18:18:02 +00:00
sound	sound fixes for 5.5-rc7	2020-01-17 08:38:35 -08:00
tools	tools lib: Fix builds when glibc contains strlcpy()	2020-02-04 18:18:01 +00:00
usr	gen_initramfs_list.sh: fix 'bad variable name' error	2020-01-04 00:00:48 +09:00
virt	PPC KVM fix for 5.5	2019-12-22 13:18:15 +01:00
.clang-format	clang-format: Update with the latest for_each macro list	2019-08-31 10:00:51 +02:00
.cocciconfig	scripts: add Linux .cocciconfig for coccinelle	2016-07-22 12:13:39 +02:00
.get_maintainer.ignore	Opt out of scripts/get_maintainer.pl	2019-05-16 10:53:40 -07:00
.gitattributes	.gitattributes: use 'dts' diff driver for dts files	2019-12-04 19:44:11 -08:00
.gitignore	modpost: dump missing namespaces into a single modules.nsdeps file	2019-11-11 20:10:01 +09:00
.mailmap	MAINTAINERS: update my email address	2020-01-11 14:33:39 -08:00
COPYING	COPYING: use the new text with points to the license files	2018-03-23 12:41:45 -06:00
CREDITS	Linux 5.4-rc4	2019-10-29 04:43:29 -06:00
Kbuild	kbuild: do not descend to ./Kbuild when cleaning	2019-08-21 21:03:58 +09:00
Kconfig	docs: kbuild: convert docs to ReST and rename to *.rst	2019-06-14 14:21:21 -06:00
MAINTAINERS	tipc: change maintainer email address	2020-01-25 10:18:02 +01:00
Makefile	Linux 5.5.2	2020-02-04 18:18:03 +00:00
README	Drop all 00-INDEX files from Documentation/	2018-09-09 15:08:58 -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.

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.