CVE: CVE-2021-47540
Published: 2024-05-24
Description: In the Linux kernel, the following vulnerability has been resolved:

mt76: mt7915: fix NULL pointer dereference in mt7915_get_phy_mode

Fix the following NULL pointer dereference in mt7915_get_phy_mode
routine adding an ibss interface to the mt7915 driver.

[  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 [PII_REDACTED]
[  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=[PII_REDACTED]0b1000
[  103.107565] [[PII_REDACTED]] pgd=[PII_REDACTED], p4d=[PII_REDACTED], pud=[PII_REDACTED]
[  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: ffffff[PII_REDACTED]
[  103.232545] x27: ffffff8005f4da22 x26: ffffff800685ac40
[  103.237855] x25: [PII_REDACTED] x24:[PII_REDACTED]00011f
[  103.243165] x23: ffffff8005f4e260 x22: ffffff[PII_REDACTED]
[  103.248475] x21: ffffff8005f4df80 x20: ffffff800685ac58
[  103.253785] x19: ffffff[PII_REDACTED] x18: [PII_REDACTED]
[  103.259094] x17: [PII_REDACTED] x16: [PII_REDACTED]
[  103.264403] x15: 000899c3a2d9d2e4 x14: 000899bdc3c3a1c8
[  103.269713] x13: [PII_REDACTED] x12: [PII_REDACTED]
[  103.275024] x11: ffffffc010e30c20 x10: [PII_REDACTED]
[  103.280333] x9 : [PII_REDACTED] x8 : ffffff8006567d88
[  103.285642] x7 : ffffff8006563b5c x6 : ffffff8006563b44
[  103.290952] x5 : [PII_REDACTED] x4 : [PII_REDACTED]
[  103.296262] x3 : [PII_REDACTED] x2 : [PII_REDACTED]
[  103.301572] x1 : [PII_REDACTED] x0 : [PII_REDACTED]
[  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 52[PII_REDACTED]00e4 7100007f (39400023)
CVSS Score: 5.5 (MEDIUM)
CWE: CWE-476
References: https://git.kernel.org/stable/c/14b03b8cebdf18ff13c39d58501b625411314de2; https://git.kernel.org/stable/c/6e53d6d26920d5221d3f4d4f5ffdd629ea69aa5c; https://git.kernel.org/stable/c/932b338f4e5c4cb0c2ed640da3bced1e63620198