wifi: ath9k: Fix potential array-index-out-of-bounds read in ath9k_htc_txstatus()

Vulnerability Description

In the Linux kernel, the following vulnerability has been resolved: wifi: ath9k: Fix potential array-index-out-of-bounds read in ath9k_htc_txstatus() Fix an array-index-out-of-bounds read in ath9k_htc_txstatus(). The bug occurs when txs->cnt, data from a URB provided by a USB device, is bigger than the size of the array txs->txstatus, which is HTC_MAX_TX_STATUS. WARN_ON() already checks it, but there is no bug handling code after the check. Make the function return if that is the case. Found by a modified version of syzkaller. UBSAN: array-index-out-of-bounds in htc_drv_txrx.c index 13 is out of range for type '__wmi_event_txstatus [12]' Call Trace: ath9k_htc_txstatus ath9k_wmi_event_tasklet tasklet_action_common __do_softirq irq_exit_rxu sysvec_apic_timer_interrupt

References

• https://git.kernel.org/stable/c/f44f073c78112ff921a220d01b86d09f2ace59bc
• https://git.kernel.org/stable/c/f11f0fd1ad6c11ae7856d4325fe9d05059767225
• https://git.kernel.org/stable/c/84770a996ad8d7f121ff2fb5a8d149aad52d64c1
• https://git.kernel.org/stable/c/9003fa9a0198ce004b30738766c67eb7373479c9
• https://git.kernel.org/stable/c/25c6f49ef59b7a9b80a3f7ab9e95268a1b01a234
• https://git.kernel.org/stable/c/e4f4bac7d3b64eb75f70cd3345712de6f68a215d
• https://git.kernel.org/stable/c/be609c7002dd4504b15b069cb7582f4c778548d1
• https://git.kernel.org/stable/c/2adc886244dff60f948497b59affb6c6ebb3c348