From: Jakub Kicinski <kuba@kernel.org>
To: Alok Tiwari <alok.a.tiwari@oracle.com>
Cc: pabeni@redhat.com, edumazet@google.com, davem@davemloft.net,
andrew+netdev@lunn.ch, jdmason@kudzu.us, dave.jiang@intel.com,
allenbh@gmail.com, ntb@lists.linux.dev, netdev@vger.kernel.org,
alok.a.tiwarilinux@gmail.com
Subject: Re: [PATCH net-next] net: ntb_netdev: Fix NULL check ordering in TX handler
Date: Wed, 25 Feb 2026 19:22:11 -0800 [thread overview]
Message-ID: <20260225192211.7a8e1be8@kernel.org> (raw)
In-Reply-To: <20260224130458.1355686-1-alok.a.tiwari@oracle.com>
On Tue, 24 Feb 2026 05:04:47 -0800 Alok Tiwari wrote:
> ntb_netdev_tx_handler() calls netdev_priv(ndev) before checking
> whether ndev is NULL. Although qp_data is expected to always be
> valid in normal operation,
Right. Can we delete the seemingly pointless null check instead?
Defensive programming is discouraged in the kernel..
> dereferencing the pointer before the
> NULL check is logically incorrect.
If you strongly prefer to keep the patch as is maybe say "valid
but surprising" rather than "logically incorrect"
> Move netdev_priv() after validating ndev.
>
> No functional change intended.
--
pw-bot: cr
next prev parent reply other threads:[~2026-02-26 3:22 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-02-24 13:04 [PATCH net-next] net: ntb_netdev: Fix NULL check ordering in TX handler Alok Tiwari
2026-02-24 14:42 ` Dave Jiang
2026-02-26 3:22 ` Jakub Kicinski [this message]
2026-02-26 14:14 ` ALOK TIWARI
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