From: David Howells <dhowells@redhat.com>
To: Colin King <colin.king@canonical.com>
Cc: dhowells@redhat.com, linux-afs@lists.infradead.org,
kernel-janitors@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] afs: use BIT_ULL for shifting to fix integer overflow
Date: Fri, 30 Aug 2019 15:01:41 +0100 [thread overview]
Message-ID: <3079.1567173701@warthog.procyon.org.uk> (raw)
In-Reply-To: <20190830104912.1090-1-colin.king@canonical.com>
Colin King <colin.king@canonical.com> wrote:
> The expression 1 << nr_slots is evaluated with 32 bit integer arithmetic
> and can overflow before it is widened.
If it does, it's an error on the part of the caller. See the banner comment:
1 <= nr_slots <= 9.
And, in any case, if nr_slots >= 64, using BIT_ULL wouldn't help...
David
next prev parent reply other threads:[~2019-08-30 14:01 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-08-30 10:49 Colin King
2019-08-30 14:01 ` David Howells [this message]
2019-08-30 14:06 ` Colin Ian King
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