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100 lines
4.5 KiB
Diff
100 lines
4.5 KiB
Diff
From: Lorenzo Bianconi <lorenzo@kernel.org>
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Date: Wed, 3 Nov 2021 18:02:35 +0100
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Subject: [PATCH] cfg80211: fix possible NULL pointer dereference in
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cfg80211_stop_offchan_radar_detection
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Fix the following NULL pointer dereference in
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cfg80211_stop_offchan_radar_detection routine that occurs when hostapd
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is stopped during the CAC on offchannel chain:
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Sat Jan 1 0[ 779.567851] ESR = 0x96000005
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0:12:50 2000 dae[ 779.572346] EC = 0x25: DABT (current EL), IL = 32 bits
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mon.debug hostap[ 779.578984] SET = 0, FnV = 0
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d: hostapd_inter[ 779.583445] EA = 0, S1PTW = 0
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face_deinit_free[ 779.587936] Data abort info:
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: num_bss=1 conf[ 779.592224] ISV = 0, ISS = 0x00000005
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->num_bss=1
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Sat[ 779.597403] CM = 0, WnR = 0
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Jan 1 00:12:50[ 779.601749] user pgtable: 4k pages, 39-bit VAs, pgdp=00000000418b2000
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2000 daemon.deb[ 779.609601] [0000000000000000] pgd=0000000000000000, p4d=0000000000000000, pud=0000000000000000
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ug hostapd: host[ 779.619657] Internal error: Oops: 96000005 [#1] SMP
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[ 779.770810] CPU: 0 PID: 2202 Comm: hostapd Not tainted 5.10.75 #0
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[ 779.776892] Hardware name: MediaTek MT7622 RFB1 board (DT)
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[ 779.782370] pstate: 80000005 (Nzcv daif -PAN -UAO -TCO BTYPE=--)
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[ 779.788384] pc : cfg80211_chandef_valid+0x10/0x490 [cfg80211]
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[ 779.794128] lr : cfg80211_check_station_change+0x3190/0x3950 [cfg80211]
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[ 779.800731] sp : ffffffc01204b7e0
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[ 779.804036] x29: ffffffc01204b7e0 x28: ffffff80039bdc00
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[ 779.809340] x27: 0000000000000000 x26: ffffffc008cb3050
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[ 779.814644] x25: 0000000000000000 x24: 0000000000000002
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[ 779.819948] x23: ffffff8002630000 x22: ffffff8003e748d0
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[ 779.825252] x21: 0000000000000cc0 x20: ffffff8003da4a00
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[ 779.830556] x19: 0000000000000000 x18: ffffff8001bf7ce0
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[ 779.835860] x17: 00000000ffffffff x16: 0000000000000000
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[ 779.841164] x15: 0000000040d59200 x14: 00000000000019c0
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[ 779.846467] x13: 00000000000001c8 x12: 000636b9e9dab1c6
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[ 779.851771] x11: 0000000000000141 x10: 0000000000000820
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[ 779.857076] x9 : 0000000000000000 x8 : ffffff8003d7d038
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[ 779.862380] x7 : 0000000000000000 x6 : ffffff8003d7d038
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[ 779.867683] x5 : 0000000000000e90 x4 : 0000000000000038
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[ 779.872987] x3 : 0000000000000002 x2 : 0000000000000004
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[ 779.878291] x1 : 0000000000000000 x0 : 0000000000000000
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[ 779.883594] Call trace:
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[ 779.886039] cfg80211_chandef_valid+0x10/0x490 [cfg80211]
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[ 779.891434] cfg80211_check_station_change+0x3190/0x3950 [cfg80211]
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[ 779.897697] nl80211_radar_notify+0x138/0x19c [cfg80211]
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[ 779.903005] cfg80211_stop_offchan_radar_detection+0x7c/0x8c [cfg80211]
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[ 779.909616] __cfg80211_leave+0x2c/0x190 [cfg80211]
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[ 779.914490] cfg80211_register_netdevice+0x1c0/0x6d0 [cfg80211]
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[ 779.920404] raw_notifier_call_chain+0x50/0x70
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[ 779.924841] call_netdevice_notifiers_info+0x54/0xa0
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[ 779.929796] __dev_close_many+0x40/0x100
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[ 779.933712] __dev_change_flags+0x98/0x190
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[ 779.937800] dev_change_flags+0x20/0x60
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[ 779.941628] devinet_ioctl+0x534/0x6d0
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[ 779.945370] inet_ioctl+0x1bc/0x230
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[ 779.948849] sock_do_ioctl+0x44/0x200
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[ 779.952502] sock_ioctl+0x268/0x4c0
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[ 779.955985] __arm64_sys_ioctl+0xac/0xd0
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[ 779.959900] el0_svc_common.constprop.0+0x60/0x110
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[ 779.964682] do_el0_svc+0x1c/0x24
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[ 779.967990] el0_svc+0x10/0x1c
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[ 779.971036] el0_sync_handler+0x9c/0x120
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[ 779.974950] el0_sync+0x148/0x180
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[ 779.978259] Code: a9bc7bfd 910003fd a90153f3 aa0003f3 (f9400000)
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[ 779.984344] ---[ end trace 0e67b4f5d6cdeec7 ]---
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[ 779.996400] Kernel panic - not syncing: Oops: Fatal exception
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[ 780.002139] SMP: stopping secondary CPUs
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[ 780.006057] Kernel Offset: disabled
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[ 780.009537] CPU features: 0x0000002,04002004
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[ 780.013796] Memory Limit: none
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Fixes: b8f5facf286b ("cfg80211: implement APIs for dedicated radar detection HW")
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Reported-by: Evelyn Tsai <evelyn.tsai@mediatek.com>
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Tested-by: Evelyn Tsai <evelyn.tsai@mediatek.com>
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Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
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Link: https://lore.kernel.org/r/c2e34c065bf8839c5ffa45498ae154021a72a520.1635958796.git.lorenzo@kernel.org
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Signed-off-by: Johannes Berg <johannes.berg@intel.com>
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---
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--- a/net/wireless/mlme.c
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+++ b/net/wireless/mlme.c
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@@ -982,6 +982,9 @@ __cfg80211_offchan_cac_event(struct cfg8
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lockdep_assert_wiphy(&rdev->wiphy);
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+ if (!cfg80211_chandef_valid(chandef))
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+ return;
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+
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if (event != NL80211_RADAR_CAC_STARTED && !rdev->offchan_radar_wdev)
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return;
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@@ -1096,6 +1099,6 @@ void cfg80211_stop_offchan_radar_detecti
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rdev_set_radar_offchan(rdev, NULL);
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- __cfg80211_offchan_cac_event(rdev, NULL, NULL,
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+ __cfg80211_offchan_cac_event(rdev, wdev, &rdev->offchan_radar_chandef,
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NL80211_RADAR_CAC_ABORTED);
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}
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