linux-kernel - Re: [PATCH 03/18] fs_context: fix detecting full log buffer

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Message-ID: <10670.1531128774@warthog.procyon.org.uk>
Date:   Mon, 09 Jul 2018 10:32:54 +0100
From:   David Howells <dhowells@...hat.com>
To:     Eric Biggers <ebiggers3@...il.com>
Cc:     dhowells@...hat.com, Alexander Viro <viro@...iv.linux.org.uk>,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        Eric Biggers <ebiggers@...gle.com>
Subject: Re: [PATCH 03/18] fs_context: fix detecting full log buffer

Eric Biggers <ebiggers3@...il.com> wrote:

> When 'head' and 'tail' wrap around, 'log->head - log->tail' will be
> something like '4 - 252 = -248', and comparing that directly to the
> array size is wrong.  Fix by casting to 'u8'.

I think a better fix is to use CIRC_CNT() or CIRC_SPACE().

David