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wifi: mt76: fix coverity overrun-call in mt76_get_txpower()

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[ Upstream commit 03dd0d49de ]

Make sure the nss is valid for nss_delta array. Return zero
if the index is invalid.

Coverity message:
Event overrun-call: Overrunning callee's array of size 4 by passing
argument "n_chains" (which evaluates to 15) in call to
"mt76_tx_power_nss_delta".
int delta = mt76_tx_power_nss_delta(n_chains);

Fixes: 07cda40630 ("mt76: fix rounding issues on converting per-chain and combined txpower")
Signed-off-by: Deren Wu <deren.wu@mediatek.com>
Signed-off-by: Felix Fietkau <nbd@nbd.name>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Deren Wu 2022-11-27 10:35:37 +08:00 • committed by Greg Kroah-Hartman
commit f532db69ab
1 changed files with 2 additions and 1 deletions
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3
drivers/net/wireless/mediatek/mt76/mt76.h
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@ -884,8 +884,9 @@ static inline bool mt76_is_skb_pktid(u8 pktid)
static inline u8 mt76_tx_power_nss_delta(u8 nss)
{
static const u8 nss_delta[4] = { 0, 6, 9, 12 };
u8 idx = nss - 1;
return nss_delta[nss - 1];
return (idx < ARRAY_SIZE(nss_delta)) ? nss_delta[idx] : 0;
}
static inline bool mt76_testmode_enabled(struct mt76_dev *dev)