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Lorenzo Bianconi b5f2ba8a4c mt76: connac: fix possible NULL pointer dereference in mt76_connac_get_phy_mode_v2 
Fix the following NULL pointer dereference in mt76_connac_get_phy_mode_v2
routine triggered on mt7663s device when sta is NULL

[    5.490700] mt7663s mmc0:0001:1: N9 Firmware Version: 3.1.1, Build Time: 20200604161656
[    5.490815] mt7663s mmc0:0001:1: Region number: 0x4
[    5.490868] mt7663s mmc0:0001:1: Parsing tailer Region: 0
[    5.496251] mt7663s mmc0:0001:1: Region 0, override_addr = 0x00118000
[    5.496419] mt7663s mmc0:0001:1: Parsing tailer Region: 1
[    5.624027] mt7663s mmc0:0001:1: Parsing tailer Region: 2
[    5.656999] mt7663s mmc0:0001:1: Parsing tailer Region: 3
[    5.671876] mt7663s mmc0:0001:1: override_addr = 0x00118000, option = 3
[    9.358658] BUG: kernel NULL pointer dereference, address: 0000000000000000
[    9.358775] #PF: supervisor read access in kernel mode
[    9.358831] #PF: error_code(0x0000) - not-present page
[    9.358886] PGD 0 P4D 0
[    9.358917] Oops: 0000 [#1] SMP
[    9.358960] CPU: 0 PID: 235 Comm: NetworkManager Not tainted 5.15.0-rc4-kvm-02151-g39e333d657f4-dirty #769
[    9.359057] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.14.0-4.fc34 04/01/2014
[    9.359150] RIP: 0010:mt76_connac_get_phy_mode_v2+0xc9/0x11c
[    9.359473] RAX: 0000000000000013 RBX: 0000000000000000 RCX: 0000000000000027
[    9.359546] RDX: ffff8881f9c17358 RSI: 0000000000000001 RDI: ffff8881f9c17350
[    9.359624] RBP: ffff88810bac1ed4 R08: ffffffff822a4a48 R09: 0000000000000003
[    9.359697] R10: ffffffff82234a60 R11: ffffffff82234a60 R12: ffff88810bac1eec
[    9.359779] R13: 0000000000000000 R14: ffff88810bad1648 R15: ffff88810bac1eb8
[    9.359859] FS:  00007f5f1e45bbc0(0000) GS:ffff8881f9c00000(0000) knlGS:0000000000000000
[    9.359939] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    9.360003] CR2: 0000000000000000 CR3: 0000000105d5d000 CR4: 00000000000006b0
[    9.360083] Call Trace:
[    9.360116]  mt76_connac_mcu_uni_add_bss.cold+0x21/0x250
[    9.360175]  ? schedule_preempt_disabled+0xa/0x10
[    9.360232]  ? __mutex_lock.constprop.0+0x2ab/0x460
[    9.360286]  mt7615_remove_interface+0x63/0x1d0
[    9.360342]  drv_remove_interface+0x32/0xe0
[    9.360385]  ieee80211_do_stop+0x5da/0x800
[    9.360428]  ? dev_reset_queue+0x30/0x90
[    9.360472]  ieee80211_stop+0x3b/0xb0
[    9.360516]  __dev_close_many+0x7a/0xd0
[    9.360559]  __dev_change_flags+0xd6/0x1f0
[    9.360604]  dev_change_flags+0x21/0x60
[    9.360648]  do_setlink+0x259/0xfb0
[    9.360686]  ? __nla_validate_parse+0x51/0xb80
[    9.360742]  __rtnl_newlink+0x5b3/0x960
[    9.360785]  ? inet6_fill_ifla6_attrs+0x41d/0x470
[    9.360841]  ? __kmalloc_track_caller+0x57/0x3c0
[    9.360905]  ? netlink_trim+0x8a/0xb0
[    9.360949]  ? skb_queue_tail+0x1b/0x50

Fixes: 67aa27431c ("mt76: mt7921: rely on mt76_connac_mcu common library")
Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
Signed-off-by: Felix Fietkau <nbd@nbd.name>
History 2021-10-20 10:36:51 +02:00
arch Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2021-10-07 15:24:06 -07:00
block block-5.15-2021-10-01 2021-10-02 11:00:36 -07:00
certs certs: Add support for using elliptic curve keys for signing modules 2021-08-23 19:55:42 +03:00
crypto Merge branch 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6 2021-08-30 12:57:10 -07:00
Documentation dt: bindings: net: mt76: add eeprom-data property 2021-10-20 10:36:48 +02:00
drivers mt76: connac: fix possible NULL pointer dereference in mt76_connac_get_phy_mode_v2 2021-10-20 10:36:51 +02:00
fs Bug fixes for NFSD error handling paths 2021-10-07 14:11:40 -07:00
include mlxsw: spectrum: use netif_is_macsec() instead of open code 2021-10-10 11:18:48 +01:00
init Merge branch 'work.init' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2021-09-24 10:18:07 -07:00
ipc ipc: remove memcg accounting for sops objects in do_semtimedop() 2021-09-14 10:22:11 -07:00
kernel Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2021-10-07 15:24:06 -07:00
lib Merge https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next 2021-10-01 19:58:02 -07:00
LICENSES LICENSES/dual/CC-BY-4.0: Git rid of "smart quotes" 2021-07-15 06:31:24 -06:00
mm mm: fix uninitialized use in overcommit_policy_handler 2021-09-24 16:13:35 -07:00
net net: make dev_get_port_parent_id slightly more readable 2021-10-10 11:29:14 +01:00
samples Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2021-10-07 15:24:06 -07:00
scripts kasan: always respect CONFIG_KASAN_STACK 2021-09-24 16:13:35 -07:00
security Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/klassert/ 2021-10-07 12:44:41 +01:00
sound ALSA: pcsp: Make hrtimer forwarding more robust 2021-09-28 10:58:08 +02:00
tools selftests/tls: add SM4 GCM/CCM to tls selftests 2021-10-08 16:58:46 -07:00
usr .gitignore: prefix local generated files with a slash 2021-05-02 00:43:35 +09:00
virt KVM: Remove tlbs_dirty 2021-09-23 11:01:12 -04:00
.clang-format clang-format: Update with the latest for_each macro list 2021-05-12 23:32:39 +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 .gitignore: ignore only top-level modules.builtin 2021-05-02 00:43:35 +09:00
.mailmap mailmap: update email address of Matthias Fuchs and Thomas Körper 2021-08-19 09:39:44 +02:00
COPYING COPYING: state that all contributions really are covered by this file 2020-02-10 13:32:20 -08:00
CREDITS MAINTAINERS: Move Daniel Drake to credits 2021-09-21 08:34:58 +03:00
Kbuild kbuild: rename hostprogs-y/always to hostprogs/always-y 2020-02-04 01:53:07 +09:00
Kconfig kbuild: ensure full rebuild when the compiler is updated 2020-05-12 13:28:33 +09:00
MAINTAINERS MAINTAINERS: add rtw89 wireless driver 2021-10-18 15:30:29 +03:00
Makefile Linux 5.15-rc4 2021-10-03 14:08:47 -07:00
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.