linux-kernel - RE: [PATCH net] net: ena: fix shift-out-of-bounds in exponential backoff

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Date:   Thu, 13 Jul 2023 15:34:25 +0000
From:   David Laight <David.Laight@...LAB.COM>
To:     'Leon Romanovsky' <leon@...nel.org>,
        Krister Johansen <kjlx@...pleofstupid.com>
CC:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Shay Agroskin <shayagr@...zon.com>,
        Arthur Kiyanovski <akiyano@...zon.com>,
        David Arinzon <darinzon@...zon.com>,
        Noam Dagan <ndagan@...zon.com>,
        Saeed Bishara <saeedb@...zon.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>
Subject: RE: [PATCH net] net: ena: fix shift-out-of-bounds in exponential
 backoff

From: Leon Romanovsky
> Sent: 11 July 2023 08:26
...
> > +#define ENA_MAX_BACKOFF_DELAY_EXP 16U
> > +
> >  #define ENA_MIN_ADMIN_POLL_US 100
> >
> >  #define ENA_MAX_ADMIN_POLL_US 5000
> > @@ -536,6 +538,7 @@ static int ena_com_comp_status_to_errno(struct ena_com_admin_queue *admin_queue,
> >
> >  static void ena_delay_exponential_backoff_us(u32 exp, u32 delay_us)
> >  {
> > +	exp = min_t(u32, exp, ENA_MAX_BACKOFF_DELAY_EXP);

This shouldn't need to be a min_t()

	David

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