From: Dan Carpenter <dan.carpenter@oracle.com>
To: Colin King <colin.king@canonical.com>
Cc: Jiri Pirko <jiri@mellanox.com>,
Ido Schimmel <idosch@mellanox.com>,
"David S . Miller" <davem@davemloft.net>,
netdev@vger.kernel.org, kernel-janitors@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH][next] mlxsw: spectrum_trap: fix unintention integer overflow on left shift
Date: Fri, 03 Apr 2020 08:46:24 +0000 [thread overview]
Message-ID: <20200403084624.GA2001@kadam> (raw)
In-Reply-To: <20200402144851.565983-1-colin.king@canonical.com>
On Thu, Apr 02, 2020 at 03:48:51PM +0100, Colin King wrote:
> From: Colin Ian King <colin.king@canonical.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@canonical.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))) {
Please delete the extra parentheses.
if (burst != BIT_ULL(bs)) {
regards,
dan carpenter
WARNING: multiple messages have this Message-ID (diff)
From: Dan Carpenter <dan.carpenter@oracle.com>
To: Colin King <colin.king@canonical.com>
Cc: Jiri Pirko <jiri@mellanox.com>,
Ido Schimmel <idosch@mellanox.com>,
"David S . Miller" <davem@davemloft.net>,
netdev@vger.kernel.org, kernel-janitors@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH][next] mlxsw: spectrum_trap: fix unintention integer overflow on left shift
Date: Fri, 3 Apr 2020 11:46:24 +0300 [thread overview]
Message-ID: <20200403084624.GA2001@kadam> (raw)
In-Reply-To: <20200402144851.565983-1-colin.king@canonical.com>
On Thu, Apr 02, 2020 at 03:48:51PM +0100, Colin King wrote:
> From: Colin Ian King <colin.king@canonical.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@canonical.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))) {
Please delete the extra parentheses.
if (burst != BIT_ULL(bs)) {
regards,
dan carpenter
next prev parent reply other threads:[~2020-04-03 8:46 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-04-02 14:48 [PATCH][next] mlxsw: spectrum_trap: fix unintention integer overflow on left shift Colin King
2020-04-02 14:48 ` Colin King
2020-04-02 15:48 ` Ido Schimmel
2020-04-02 15:48 ` Ido Schimmel
2020-04-03 1:00 ` David Miller
2020-04-03 1:00 ` David Miller
2020-04-03 8:46 ` Dan Carpenter [this message]
2020-04-03 8:46 ` Dan Carpenter
2020-04-03 16:05 ` [PATCH][next] mlxsw: spectrum_trap: Fix unintentional " Markus Elfring
2020-04-03 16:05 ` Markus Elfring
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