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91e89c7732
Fix the following NULL pointer dereference in cfg80211_stop_offchan_radar_detection routine that occurs when hostapd is stopped during the CAC on offchannel chain: Sat Jan 1 0[ 779.567851] ESR = 0x96000005 0:12:50 2000 dae[ 779.572346] EC = 0x25: DABT (current EL), IL = 32 bits mon.debug hostap[ 779.578984] SET = 0, FnV = 0 d: hostapd_inter[ 779.583445] EA = 0, S1PTW = 0 face_deinit_free[ 779.587936] Data abort info: : num_bss=1 conf[ 779.592224] ISV = 0, ISS = 0x00000005 ->num_bss=1 Sat[ 779.597403] CM = 0, WnR = 0 Jan 1 00:12:50[ 779.601749] user pgtable: 4k pages, 39-bit VAs, pgdp=00000000418b2000 2000 daemon.deb[ 779.609601] [0000000000000000] pgd=0000000000000000, p4d=0000000000000000, pud=0000000000000000 ug hostapd: host[ 779.619657] Internal error: Oops: 96000005 [#1] SMP [ 779.770810] CPU: 0 PID: 2202 Comm: hostapd Not tainted 5.10.75 #0 [ 779.776892] Hardware name: MediaTek MT7622 RFB1 board (DT) [ 779.782370] pstate: 80000005 (Nzcv daif -PAN -UAO -TCO BTYPE=--) [ 779.788384] pc : cfg80211_chandef_valid+0x10/0x490 [cfg80211] [ 779.794128] lr : cfg80211_check_station_change+0x3190/0x3950 [cfg80211] [ 779.800731] sp : ffffffc01204b7e0 [ 779.804036] x29: ffffffc01204b7e0 x28: ffffff80039bdc00 [ 779.809340] x27: 0000000000000000 x26: ffffffc008cb3050 [ 779.814644] x25: 0000000000000000 x24: 0000000000000002 [ 779.819948] x23: ffffff8002630000 x22: ffffff8003e748d0 [ 779.825252] x21: 0000000000000cc0 x20: ffffff8003da4a00 [ 779.830556] x19: 0000000000000000 x18: ffffff8001bf7ce0 [ 779.835860] x17: 00000000ffffffff x16: 0000000000000000 [ 779.841164] x15: 0000000040d59200 x14: 00000000000019c0 [ 779.846467] x13: 00000000000001c8 x12: 000636b9e9dab1c6 [ 779.851771] x11: 0000000000000141 x10: 0000000000000820 [ 779.857076] x9 : 0000000000000000 x8 : ffffff8003d7d038 [ 779.862380] x7 : 0000000000000000 x6 : ffffff8003d7d038 [ 779.867683] x5 : 0000000000000e90 x4 : 0000000000000038 [ 779.872987] x3 : 0000000000000002 x2 : 0000000000000004 [ 779.878291] x1 : 0000000000000000 x0 : 0000000000000000 [ 779.883594] Call trace: [ 779.886039] cfg80211_chandef_valid+0x10/0x490 [cfg80211] [ 779.891434] cfg80211_check_station_change+0x3190/0x3950 [cfg80211] [ 779.897697] nl80211_radar_notify+0x138/0x19c [cfg80211] [ 779.903005] cfg80211_stop_offchan_radar_detection+0x7c/0x8c [cfg80211] [ 779.909616] __cfg80211_leave+0x2c/0x190 [cfg80211] [ 779.914490] cfg80211_register_netdevice+0x1c0/0x6d0 [cfg80211] [ 779.920404] raw_notifier_call_chain+0x50/0x70 [ 779.924841] call_netdevice_notifiers_info+0x54/0xa0 [ 779.929796] __dev_close_many+0x40/0x100 [ 779.933712] __dev_change_flags+0x98/0x190 [ 779.937800] dev_change_flags+0x20/0x60 [ 779.941628] devinet_ioctl+0x534/0x6d0 [ 779.945370] inet_ioctl+0x1bc/0x230 [ 779.948849] sock_do_ioctl+0x44/0x200 [ 779.952502] sock_ioctl+0x268/0x4c0 [ 779.955985] __arm64_sys_ioctl+0xac/0xd0 [ 779.959900] el0_svc_common.constprop.0+0x60/0x110 [ 779.964682] do_el0_svc+0x1c/0x24 [ 779.967990] el0_svc+0x10/0x1c [ 779.971036] el0_sync_handler+0x9c/0x120 [ 779.974950] el0_sync+0x148/0x180 [ 779.978259] Code: a9bc7bfd 910003fd a90153f3 aa0003f3 (f9400000) [ 779.984344] ---[ end trace 0e67b4f5d6cdeec7 ]--- [ 779.996400] Kernel panic - not syncing: Oops: Fatal exception [ 780.002139] SMP: stopping secondary CPUs [ 780.006057] Kernel Offset: disabled [ 780.009537] CPU features: 0x0000002,04002004 [ 780.013796] Memory Limit: none Fixes: b8f5facf286b ("cfg80211: implement APIs for dedicated radar detection HW") Reported-by: Evelyn Tsai <evelyn.tsai@mediatek.com> Tested-by: Evelyn Tsai <evelyn.tsai@mediatek.com> Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org> Link: https://lore.kernel.org/r/c2e34c065bf8839c5ffa45498ae154021a72a520.1635958796.git.lorenzo@kernel.org Signed-off-by: Johannes Berg <johannes.berg@intel.com>
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.