| Message ID | 20231113065756.1491991-1-linuxlovemin@yonsei.ac.kr |
|---|---|
| State | New |
| Headers | show |
| Series | [v2] wifi: ath9k: Fix potential array-index-out-of-bounds read in ath9k_htc_txstatus() | expand |
Minsuk Kang <linuxlovemin@yonsei.ac.kr> writes: > 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 > > Signed-off-by: Minsuk Kang <linuxlovemin@yonsei.ac.kr> Acked-by: Toke Høiland-Jørgensen <toke@toke.dk>
Minsuk Kang <linuxlovemin@yonsei.ac.kr> wrote: > 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 > > Signed-off-by: Minsuk Kang <linuxlovemin@yonsei.ac.kr> > Acked-by: Toke Høiland-Jørgensen <toke@toke.dk> > Signed-off-by: Kalle Valo <quic_kvalo@quicinc.com> Patch applied to ath-next branch of ath.git, thanks. 2adc886244df wifi: ath9k: Fix potential array-index-out-of-bounds read in ath9k_htc_txstatus()
diff --git a/drivers/net/wireless/ath/ath9k/htc_drv_txrx.c b/drivers/net/wireless/ath/ath9k/htc_drv_txrx.c index 800177021baf..efcaeccb055a 100644 --- a/drivers/net/wireless/ath/ath9k/htc_drv_txrx.c +++ b/drivers/net/wireless/ath/ath9k/htc_drv_txrx.c @@ -652,9 +652,10 @@ void ath9k_htc_txstatus(struct ath9k_htc_priv *priv, void *wmi_event) struct ath9k_htc_tx_event *tx_pend; int i; - for (i = 0; i < txs->cnt; i++) { - WARN_ON(txs->cnt > HTC_MAX_TX_STATUS); + if (WARN_ON_ONCE(txs->cnt > HTC_MAX_TX_STATUS)) + return; + for (i = 0; i < txs->cnt; i++) { __txs = &txs->txstatus[i]; skb = ath9k_htc_tx_get_packet(priv, __txs);
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 Signed-off-by: Minsuk Kang <linuxlovemin@yonsei.ac.kr> --- v1->v2: Use WARN_ON_ONCE() instead of WARN_ON() drivers/net/wireless/ath/ath9k/htc_drv_txrx.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-)