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Message-Id: <20210301161207.456971789@linuxfoundation.org> Date: Mon, 1 Mar 2021 17:04:45 +0100 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-kernel@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, stable@...r.kernel.org, Colin Ian King <colin.king@...onical.com>, Johannes Berg <johannes.berg@...el.com>, Sasha Levin <sashal@...nel.org> Subject: [PATCH 5.11 117/775] mac80211: fix potential overflow when multiplying to u32 integers From: Colin Ian King <colin.king@...onical.com> [ Upstream commit 6194f7e6473be78acdc5d03edd116944bdbb2c4e ] The multiplication of the u32 variables tx_time and estimated_retx is performed using a 32 bit multiplication and the result is stored in a u64 result. This has a potential u32 overflow issue, so avoid this by casting tx_time to a u64 to force a 64 bit multiply. Addresses-Coverity: ("Unintentional integer overflow") Fixes: 050ac52cbe1f ("mac80211: code for on-demand Hybrid Wireless Mesh Protocol") Signed-off-by: Colin Ian King <colin.king@...onical.com> Link: https://lore.kernel.org/r/20210205175352.208841-1-colin.king@canonical.com Signed-off-by: Johannes Berg <johannes.berg@...el.com> Signed-off-by: Sasha Levin <sashal@...nel.org> --- net/mac80211/mesh_hwmp.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/net/mac80211/mesh_hwmp.c b/net/mac80211/mesh_hwmp.c index 313eee12410ec..3db514c4c63ab 100644 --- a/net/mac80211/mesh_hwmp.c +++ b/net/mac80211/mesh_hwmp.c @@ -356,7 +356,7 @@ u32 airtime_link_metric_get(struct ieee80211_local *local, */ tx_time = (device_constant + 10 * test_frame_len / rate); estimated_retx = ((1 << (2 * ARITH_SHIFT)) / (s_unit - err)); - result = (tx_time * estimated_retx) >> (2 * ARITH_SHIFT); + result = ((u64)tx_time * estimated_retx) >> (2 * ARITH_SHIFT); return (u32)result; } -- 2.27.0
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