linux-kernel - Re: [PATCH] fscache: fscache_set_key()

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Message-ID: <235fd31a-b20a-58e1-1cb9-0b0e02fce415@gmail.com>
Date:   Fri, 3 Aug 2018 19:26:07 +0200
From:   Tomas Bortoli <tomasbortoli@...il.com>
To:     David Howells <dhowells@...hat.com>
Cc:     linux-cachefs@...hat.com, linux-kernel@...r.kernel.org,
        syzkaller@...glegroups.com
Subject: Re: [PATCH] fscache: fscache_set_key() - align alloc and usage

On 08/03/2018 03:49 PM, David Howells wrote:
> Tomas Bortoli <tomasbortoli@...il.com> wrote:
> 
>> The fscache_set_key() function allocates the buf pointer if index_key_len >
>> sizeof(cookie->inline_key).  In such cases the allocated space might not be
>> aligned with the pointer type.  This may result in an out-of-bound in the
>> for-loop later in the same function, as the counter is rounded up.
> 
> Yeah, it's good idea anyway since I should tell the allocator everything that
> I expect to use - though kmalloc() will effectively rounds up the size to a
> multiple of 8 anyway (ie. the smallest allocation granule is 8 bytes).
> 
> David
> 

Yeah I forgot that :) at least KASAN won't complain anymore.

Tomas