> Fix the following NULL pointer dereference in mt7915_get_phy_mode
> routine adding an ibss interface to the mt7915 driver.
Hi Kalle and Felix,
I guess we can apply this patch in wireless-drivers tree since the issue is
already in Linus's tree. What do you think?
Regards,
Lorenzo
>
> [ 101.137097] wlan0: Trigger new scan to find an IBSS to join
> [ 102.827039] wlan0: Creating new IBSS network, BSSID 26:a4:50:1a:6e:69
> [ 103.064756] Unable to handle kernel NULL pointer dereference at virtual address 0000000000000000
> [ 103.073670] Mem abort info:
> [ 103.076520] ESR = 0x96000005
> [ 103.079614] EC = 0x25: DABT (current EL), IL = 32 bits
> [ 103.084934] SET = 0, FnV = 0
> [ 103.088042] EA = 0, S1PTW = 0
> [ 103.091215] Data abort info:
> [ 103.094104] ISV = 0, ISS = 0x00000005
> [ 103.098041] CM = 0, WnR = 0
> [ 103.101044] user pgtable: 4k pages, 39-bit VAs, pgdp=00000000460b1000
> [ 103.107565] [0000000000000000] pgd=0000000000000000, p4d=0000000000000000, pud=0000000000000000
> [ 103.116590] Internal error: Oops: 96000005 [#1] SMP
> [ 103.189066] CPU: 1 PID: 333 Comm: kworker/u4:3 Not tainted 5.10.75 #0
> [ 103.195498] Hardware name: MediaTek MT7622 RFB1 board (DT)
> [ 103.201124] Workqueue: phy0 ieee80211_iface_work [mac80211]
> [ 103.206695] pstate: 20000005 (nzCv daif -PAN -UAO -TCO BTYPE=--)
> [ 103.212705] pc : mt7915_get_phy_mode+0x68/0x120 [mt7915e]
> [ 103.218103] lr : mt7915_mcu_add_bss_info+0x11c/0x760 [mt7915e]
> [ 103.223927] sp : ffffffc011cdb9e0
> [ 103.227235] x29: ffffffc011cdb9e0 x28: ffffff8006563098
> [ 103.232545] x27: ffffff8005f4da22 x26: ffffff800685ac40
> [ 103.237855] x25: 0000000000000001 x24: 000000000000011f
> [ 103.243165] x23: ffffff8005f4e260 x22: ffffff8006567918
> [ 103.248475] x21: ffffff8005f4df80 x20: ffffff800685ac58
> [ 103.253785] x19: ffffff8006744400 x18: 0000000000000000
> [ 103.259094] x17: 0000000000000000 x16: 0000000000000001
> [ 103.264403] x15: 000899c3a2d9d2e4 x14: 000899bdc3c3a1c8
> [ 103.269713] x13: 0000000000000000 x12: 0000000000000000
> [ 103.275024] x11: ffffffc010e30c20 x10: 0000000000000000
> [ 103.280333] x9 : 0000000000000050 x8 : ffffff8006567d88
> [ 103.285642] x7 : ffffff8006563b5c x6 : ffffff8006563b44
> [ 103.290952] x5 : 0000000000000002 x4 : 0000000000000001
> [ 103.296262] x3 : 0000000000000001 x2 : 0000000000000001
> [ 103.301572] x1 : 0000000000000000 x0 : 0000000000000011
> [ 103.306882] Call trace:
> [ 103.309328] mt7915_get_phy_mode+0x68/0x120 [mt7915e]
> [ 103.314378] mt7915_bss_info_changed+0x198/0x200 [mt7915e]
> [ 103.319941] ieee80211_bss_info_change_notify+0x128/0x290 [mac80211]
> [ 103.326360] __ieee80211_sta_join_ibss+0x308/0x6c4 [mac80211]
> [ 103.332171] ieee80211_sta_create_ibss+0x8c/0x10c [mac80211]
> [ 103.337895] ieee80211_ibss_work+0x3dc/0x614 [mac80211]
> [ 103.343185] ieee80211_iface_work+0x388/0x3f0 [mac80211]
> [ 103.348495] process_one_work+0x288/0x690
> [ 103.352499] worker_thread+0x70/0x464
> [ 103.356157] kthread+0x144/0x150
> [ 103.359380] ret_from_fork+0x10/0x18
> [ 103.362952] Code: 394008c3 52800220 394000e4 7100007f (39400023)
>
> Fixes: 37f4ca907c46 ("mt76: mt7915: register per-phy HE capabilities for each interface")
> Fixes: e57b7901469f ("mt76: add mac80211 driver for MT7915 PCIe-based chipsets")
> Signed-off-by: Lorenzo Bianconi <lorenzo@xxxxxxxxxx>
> ---
> drivers/net/wireless/mediatek/mt76/mt7915/mcu.c | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/net/wireless/mediatek/mt76/mt7915/mcu.c b/drivers/net/wireless/mediatek/mt76/mt7915/mcu.c
> index 42e9ce99e046..2894da63f319 100644
> --- a/drivers/net/wireless/mediatek/mt76/mt7915/mcu.c
> +++ b/drivers/net/wireless/mediatek/mt76/mt7915/mcu.c
> @@ -176,7 +176,7 @@ mt7915_get_phy_mode(struct ieee80211_vif *vif, struct ieee80211_sta *sta)
> if (ht_cap->ht_supported)
> mode |= PHY_MODE_GN;
>
> - if (he_cap->has_he)
> + if (he_cap && he_cap->has_he)
> mode |= PHY_MODE_AX_24G;
> } else if (band == NL80211_BAND_5GHZ) {
> mode |= PHY_MODE_A;
> @@ -187,7 +187,7 @@ mt7915_get_phy_mode(struct ieee80211_vif *vif, struct ieee80211_sta *sta)
> if (vht_cap->vht_supported)
> mode |= PHY_MODE_AC;
>
> - if (he_cap->has_he)
> + if (he_cap && he_cap->has_he)
> mode |= PHY_MODE_AX_5G;
> }
>
> --
> 2.31.1
>
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