linux-kernel - Re: [PATCH v6.13 v2] fs/netfs/read_collect: fix crash due to uninitialized `prev` variable

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Message-ID: <3979099.1739539008@warthog.procyon.org.uk>
Date: Fri, 14 Feb 2025 13:16:48 +0000
From: David Howells <dhowells@...hat.com>
To: Max Kellermann <max.kellermann@...os.com>
Cc: dhowells@...hat.com, netfs@...ts.linux.dev,
    linux-kernel@...r.kernel.org, stable@...r.kernel.org
Subject: Re: [PATCH v6.13 v2] fs/netfs/read_collect: fix crash due to uninitialized `prev` variable

Max Kellermann <max.kellermann@...os.com> wrote:

> When checking whether the edges of adjacent subrequests touch, the
> `prev` variable is deferenced, but it might not have been initialized.
> This causes crashes like this one:
> 
>  BUG: unable to handle page fault for address: 0000000181343843
> ...
> 
> Fixes: ee4cdf7ba857 ("netfs: Speed up buffered reading")
> Cc: stable@...r.kernel.org
> Signed-off-by: Max Kellermann <max.kellermann@...os.com>

Signed-off-by: David Howells <dhowells@...hat.com>