netdev - Re: ax25: fix possible use-after-free

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Message-ID: <73130cb1-4fe8-6079-4e9b-678cb34de9b2@gmail.com>
Date:   Sun, 17 Feb 2019 10:39:08 -0800
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     f6bvp <f6bvp@...e.fr>, netdev@...r.kernel.org
Subject: Re: ax25: fix possible use-after-free



On 02/16/2019 02:33 PM, f6bvp wrote:
> 
> Patch applied successfully on Linux draws-f6bvp 4.14.79-v7+ #1159 SMP Sun Nov 4 17:50:20 GMT 2018 armv7l GNU/Linux
> 
> However ax25_route_lock_use and ax25_route_lock_unuse() are not declared and compile failed.
> 
> make : on entre dans le répertoire « /usr/src/linux-headers-4.14.79-v7+ »
>   CC [M]  /usr/src/linux-4.14.y/net/ax25/ax25_ip.o
> /usr/src/linux-4.14.y/net/ax25/ax25_ip.c: In function ‘ax25_ip_xmit’:
> /usr/src/linux-4.14.y/net/ax25/ax25_ip.c:117:2: error: implicit declaration of function ‘ax25_route_lock_use’ [-Werror=implicit-function-declaration]
>   ax25_route_lock_use();
>   ^~~~~~~~~~~~~~~~~~~
> /usr/src/linux-4.14.y/net/ax25/ax25_ip.c:211:2: error: implicit declaration of function ‘ax25_route_lock_unuse’ [-Werror=implicit-function-declaration]
>   ax25_route_lock_unuse();
>   ^~~~~~~~~~~~~~~~~~~~~
> cc1: some warnings being treated as errors
> scripts/Makefile.build:328 : la recette pour la cible « /usr/src/linux-4.14.y/net/ax25/ax25_ip.o » a echouee
> make[1]: *** [/usr/src/linux-4.14.y/net/ax25/ax25_ip.o] Erreur 1
> Makefile:1527 : la recette pour la cible « _module_/usr/src/linux-4.14.y/net/ax25 » a echouee
> make: *** [_module_/usr/src/linux-4.14.y/net/ax25] Erreur 2
> make : on quitte le repertoire « /usr/src/linux-headers-4.14.79-v7+ »
> 
> 
> Bernard, f6bvp
> 

Hi Bernard

Are you sure you applied the patch correctly/completely ?

git cherry-pick worked without conflicts on top of 4.14.100