[PATCH 4.14 058/218] ath9k_htc: fix potential out of bounds access with invalid rxstatus->rs_keyix

Greg Kroah-Hartman
2022-06-13T10:45:49Z

From: Dan Carpenter <dan.carpenter@oracle.com>

[ Upstream commit 2dc509305cf956381532792cb8dceef2b1504765 ]

The "rxstatus->rs_keyix" eventually gets passed to test_bit() so we need to
ensure that it is within the bitmap.

drivers/net/wireless/ath/ath9k/common.c:46 ath9k_cmn_rx_accept()
error: passing untrusted data 'rx_stats->rs_keyix' to 'test_bit()'

Fixes: 4ed1a8d4a257 ("ath9k_htc: use ath9k_cmn_rx_accept")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Acked-by: Toke Høiland-Jørgensen <toke@toke.dk>
Signed-off-by: Kalle Valo <quic_kvalo@quicinc.com>
Link: https://lore.kernel.org/r/20220409061225.GA5447@kili
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/net/wireless/ath/ath9k/htc_drv_txrx.c | 8 ++++++++
1 file changed, 8 insertions(+)

diff --git a/drivers/net/wireless/ath/ath9k/htc_drv_txrx.c b/drivers/net/wireless/ath/ath9k/htc_drv_txrx.c
index 6782c3d0c333..e62ed7f42281 100644
--- a/drivers/net/wireless/ath/ath9k/htc_drv_txrx.c
+++ b/drivers/net/wireless/ath/ath9k/htc_drv_txrx.c
@@ -1005,6 +1005,14 @@ static bool ath9k_rx_prepare(struct ath9k_htc_priv *priv,
goto rx_next;
}

+ if (rxstatus->rs_keyix >= ATH_KEYMAX &&
+ rxstatus->rs_keyix != ATH9K_RXKEYIX_INVALID) {
+ ath_dbg(common, ANY,
+ "Invalid keyix, dropping (keyix: %d)\n",
+ rxstatus->rs_keyix);
+ goto rx_next;
+ }
+
/* Get the RX status information */

memset(rx_status, 0, sizeof(struct ieee80211_rx_status));
--
2.35.1