linux-kernel - Re: [PATCH net-next v8 2/3] net: ethernet: ti: Add desc_infos member to struct k3_cppi_desc

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Date: Wed, 10 Apr 2024 06:24:11 -0700
From: Jakub Kicinski <kuba@...nel.org>
To: Julien Panis <jpanis@...libre.com>
Cc: "David S. Miller" <davem@...emloft.net>, Eric Dumazet
 <edumazet@...gle.com>, Paolo Abeni <pabeni@...hat.com>, Russell King
 <linux@...linux.org.uk>, Alexei Starovoitov <ast@...nel.org>, Daniel
 Borkmann <daniel@...earbox.net>, Jesper Dangaard Brouer <hawk@...nel.org>,
 John Fastabend <john.fastabend@...il.com>, Sumit Semwal
 <sumit.semwal@...aro.org>, Christian König
 <christian.koenig@....com>, Simon Horman <horms@...nel.org>, Andrew Lunn
 <andrew@...n.ch>, Ratheesh Kannoth <rkannoth@...vell.com>, Naveen
 Mamindlapalli <naveenm@...vell.com>, danishanwar@...com,
 yuehaibing@...wei.com, rogerq@...nel.org, netdev@...r.kernel.org,
 linux-kernel@...r.kernel.org, bpf@...r.kernel.org,
 linux-media@...r.kernel.org, dri-devel@...ts.freedesktop.org,
 linaro-mm-sig@...ts.linaro.org
Subject: Re: [PATCH net-next v8 2/3] net: ethernet: ti: Add desc_infos
 member to struct k3_cppi_desc_pool

On Wed, 10 Apr 2024 10:36:16 +0200 Julien Panis wrote:
> Also, about mem alloc failures, shouldn't we free 'pool' on kstrdup_const()
> error at the beginning of k3_cppi_desc_pool_create_name() ?
> I mean, it's not visible in my patch but I now wonder if this was done
> properly even before I modify the file.

Yes, it uses managed memory (devm_*) but prueth (I didn't check other
callers) calls it from .ndo_open. So while not technically a full leak
we can accumulate infinite memory by repeatedly failing here :S