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net: stmmac: gmac5+: fix potential integer overflow on 32 bit multiply 

The multiplication of cfg->ctr[1] by 1000000000 is performed using a
32 bit multiplication (since cfg->ctr[1] is a u32) and this can lead
to a potential overflow. Fix this by making the constant a ULL to
ensure a 64 bit multiply occurs.

Fixes: 504723af0d ("net: stmmac: Add basic EST support for GMAC5+")
Addresses-Coverity: ("Unintentional integer overflow")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Colin Ian King 2020-05-01 15:10:16 +01:00 committed by David S. Miller
parent a7df4870d7
commit 44d95cc6b1
1 changed files with 1 additions and 1 deletions
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2
drivers/net/ethernet/stmicro/stmmac/dwmac5.c
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@ -624,7 +624,7 @@ int dwmac5_est_configure(void __iomem *ioaddr, struct stmmac_est *cfg,
total_offset += offset;
}
total_ctr = cfg->ctr[0] + cfg->ctr[1] * 1000000000;
total_ctr = cfg->ctr[0] + cfg->ctr[1] * 1000000000ULL;
total_ctr += total_offset;
ctr_low = do_div(total_ctr, 1000000000);