From: Harshitha Prem Date: Sat, 26 Aug 2023 05:42:44 +0000 (+0300) Subject: wifi: ath12k: fix undefined behavior with __fls in dp X-Git-Tag: v6.6.17~3607 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=2b9157d41e221dbdd76a668890d1b44f272665a8;p=platform%2Fkernel%2Flinux-rpi.git wifi: ath12k: fix undefined behavior with __fls in dp [ Upstream commit d48f55e773dcce8fcf9e587073452a4944011b11 ] When max virtual ap interfaces are configured in all the bands with ACS and hostapd restart is done every 60s, a crash is observed at random times because of handling the uninitialized peer fragments with fragment id of packet as 0. "__fls" would have an undefined behavior if the argument is passed as "0". Hence, added changes to handle the same. Tested-on: QCN9274 hw2.0 PCI WLAN.WBE.1.0.1-00029-QCAHKSWPL_SILICONZ-1 Fixes: d889913205cf ("wifi: ath12k: driver for Qualcomm Wi-Fi 7 devices") Signed-off-by: Harshitha Prem Signed-off-by: Kalle Valo Link: https://lore.kernel.org/r/20230821130343.29495-3-quic_hprem@quicinc.com Signed-off-by: Sasha Levin --- diff --git a/drivers/net/wireless/ath/ath12k/dp_rx.c b/drivers/net/wireless/ath/ath12k/dp_rx.c index e6e64d4..17da39b 100644 --- a/drivers/net/wireless/ath/ath12k/dp_rx.c +++ b/drivers/net/wireless/ath/ath12k/dp_rx.c @@ -3229,7 +3229,7 @@ static int ath12k_dp_rx_frag_h_mpdu(struct ath12k *ar, goto out_unlock; } - if (frag_no > __fls(rx_tid->rx_frag_bitmap)) + if ((!rx_tid->rx_frag_bitmap || frag_no > __fls(rx_tid->rx_frag_bitmap))) __skb_queue_tail(&rx_tid->rx_frags, msdu); else ath12k_dp_rx_h_sort_frags(ab, &rx_tid->rx_frags, msdu);