linux-kernel - [PATCH] net: stmmac: Fix possible division by zero

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Date:   Fri,  3 Dec 2021 03:37:29 +0500
From:   Ameer Hamza <amhamza.mgc@...il.com>
To:     davem@...emloft.net, kuba@...nel.org, mcoquelin.stm32@...il.com,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     amhamza.mgc@...il.com
Subject: [PATCH] net: stmmac: Fix possible division by zero

Fix for divide by zero error reported by Coverity.

Addresses-Coverity: 1494557 ("Division or modulo by zero")

Signed-off-by: Ameer Hamza <amhamza.mgc@...il.com>
---
 drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index da8306f60730..f44400323407 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -863,7 +863,7 @@ int stmmac_init_tstamp_counter(struct stmmac_priv *priv, u32 systime_flags)
 	stmmac_config_sub_second_increment(priv, priv->ptpaddr,
 					   priv->plat->clk_ptp_rate,
 					   xmac, &sec_inc);
-	temp = div_u64(1000000000ULL, sec_inc);
+	temp = div_u64(1000000000ULL, (sec_inc > 0) ? sec_inc : 1);
 
 	/* Store sub second increment for later use */
 	priv->sub_second_inc = sec_inc;
-- 
2.25.1