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Date: Wed, 15 Apr 2020 07:46:56 -0400 From: Sasha Levin <sashal@...nel.org> To: linux-kernel@...r.kernel.org, stable@...r.kernel.org Cc: Jisheng Zhang <Jisheng.Zhang@...aptics.com>, "David S . Miller" <davem@...emloft.net>, Sasha Levin <sashal@...nel.org>, netdev@...r.kernel.org, linux-stm32@...md-mailman.stormreply.com, linux-arm-kernel@...ts.infradead.org Subject: [PATCH AUTOSEL 4.14 15/30] net: stmmac: dwmac1000: fix out-of-bounds mac address reg setting From: Jisheng Zhang <Jisheng.Zhang@...aptics.com> [ Upstream commit 3e1221acf6a8f8595b5ce354bab4327a69d54d18 ] Commit 9463c4455900 ("net: stmmac: dwmac1000: Clear unused address entries") cleared the unused mac address entries, but introduced an out-of bounds mac address register programming bug -- After setting the secondary unicast mac addresses, the "reg" value has reached netdev_uc_count() + 1, thus we should only clear address entries if (addr < perfect_addr_number) Fixes: 9463c4455900 ("net: stmmac: dwmac1000: Clear unused address entries") Signed-off-by: Jisheng Zhang <Jisheng.Zhang@...aptics.com> Signed-off-by: David S. Miller <davem@...emloft.net> Signed-off-by: Sasha Levin <sashal@...nel.org> --- drivers/net/ethernet/stmicro/stmmac/dwmac1000_core.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac1000_core.c b/drivers/net/ethernet/stmicro/stmmac/dwmac1000_core.c index 08dd6a06ac58d..f76d4a7281af0 100644 --- a/drivers/net/ethernet/stmicro/stmmac/dwmac1000_core.c +++ b/drivers/net/ethernet/stmicro/stmmac/dwmac1000_core.c @@ -218,7 +218,7 @@ static void dwmac1000_set_filter(struct mac_device_info *hw, reg++; } - while (reg <= perfect_addr_number) { + while (reg < perfect_addr_number) { writel(0, ioaddr + GMAC_ADDR_HIGH(reg)); writel(0, ioaddr + GMAC_ADDR_LOW(reg)); reg++; -- 2.20.1
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