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Message-Id: <20200402144851.565983-1-colin.king@canonical.com>
Date: Thu, 2 Apr 2020 15:48:51 +0100
From: Colin King <colin.king@...onical.com>
To: Jiri Pirko <jiri@...lanox.com>, Ido Schimmel <idosch@...lanox.com>,
"David S . Miller" <davem@...emloft.net>, netdev@...r.kernel.org
Cc: kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH][next] mlxsw: spectrum_trap: fix unintention integer overflow on left shift
From: Colin Ian King <colin.king@...onical.com>
Shifting the integer value 1 is evaluated using 32-bit
arithmetic and then used in an expression that expects a 64-bit
value, so there is potentially an integer overflow. Fix this
by using the BIT_ULL macro to perform the shift and avoid the
overflow.
Addresses-Coverity: ("Unintentional integer overflow")
Fixes: 13f2e64b94ea ("mlxsw: spectrum_trap: Add devlink-trap policer support")
Signed-off-by: Colin Ian King <colin.king@...onical.com>
---
drivers/net/ethernet/mellanox/mlxsw/spectrum_trap.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_trap.c b/drivers/net/ethernet/mellanox/mlxsw/spectrum_trap.c
index 9096ffd89e50..fbf714d027d8 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_trap.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_trap.c
@@ -643,7 +643,7 @@ static int mlxsw_sp_trap_policer_bs(u64 burst, u8 *p_burst_size,
{
int bs = fls64(burst) - 1;
- if (burst != (1 << bs)) {
+ if (burst != (BIT_ULL(bs))) {
NL_SET_ERR_MSG_MOD(extack, "Policer burst size is not power of two");
return -EINVAL;
}
--
2.25.1
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