CVE-2022-50179

In the Linux kernel, the following vulnerability has been resolved: ath9k: fix use-after-free in ath9k_hif_usb_rx_cb Syzbot reported use-after-free Read in ath9k_hif_usb_rx_cb() [0]. The problem was in incorrect htc_handle->drv_priv initialization. Probable call trace which can trigger use-after-free: ath9k_htc_probe_device() /* htc_handle->drv_priv = priv; */ ath9k_htc_wait_for_target() <--- Failed ieee80211_free_hw() <--- priv pointer is freed <IRQ> ... ath9k_hif_usb_rx_cb() ath9k_hif_usb_rx_stream() RX_STAT_INC() <--- htc_handle->drv_priv access In order to not add fancy protection for drv_priv we can move htc_handle->drv_priv initialization at the end of the ath9k_htc_probe_device() and add helper macro to make all *_STAT_* macros NULL safe, since syzbot has reported related NULL deref in that macros [1]

• linux linux kernel (>= 2.6.35 < 4.14.291) • linux linux kernel (>= 4.15 < 4.19.256) • linux linux kernel (>= 4.20 < 5.4.211) • linux linux kernel (>= 5.5 < 5.10.137) • linux linux kernel (>= 5.11 < 5.15.61) • linux linux kernel (>= 5.16 < 5.18.18) • linux linux kernel (>= 5.19 < 5.19.2)