netdev - Re: [PATCH net v2] net: dlink: handle dma_map

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20251010065515.GA3115768@horms.kernel.org>
Date: Fri, 10 Oct 2025 07:55:15 +0100
From: Simon Horman <horms@...nel.org>
To: Yeounsu Moon <yyyynoom@...il.com>
Cc: Andrew Lunn <andrew+netdev@...n.ch>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net v2] net: dlink: handle dma_map_single() failure
 properly

On Fri, Oct 10, 2025 at 12:57:16AM +0900, Yeounsu Moon wrote:
> There is no error handling for `dma_map_single()` failures.
> 
> Add error handling by checking `dma_mapping_error()` and freeing
> the `skb` using `dev_kfree_skb()` (process context) when it fails.
> 
> Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
> Signed-off-by: Yeounsu Moon <yyyynoom@...il.com>
> Tested-on: D-Link DGE-550T Rev-A3
> Suggested-by: Simon Horman <horms@...nel.org>

FWIIW, I don't think my Suggested-by tag is strictly necessary here. I did
suggest an implementation approach. And I'm very happy that you took my
idea on board. But I'd view as more of a tweak in this case. Because the
overall meaning of the patch remains the same as your original version.

> ---
> Changelog:
> v2:
> - fix one thing properly
> - use goto statement, per Simon's suggestion
> v1: https://lore.kernel.org/netdev/20251002152638.1165-1-yyyynoom@gmail.com/

Thanks for the update, this version looks good to me.

Reviewed-by: Simon Horman <horms@...nel.org>