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Message-ID: <956286e2-06fc-4d43-e78e-8f2059292aab@kernel.dk>
Date: Thu, 11 Jul 2019 20:02:10 -0600
From: Jens Axboe <axboe@...nel.dk>
To: Wenwen Wang <wang6495@....edu>, Wenwen Wang <wenwen@...uga.edu>
Cc: "open list:BLOCK LAYER" <linux-block@...r.kernel.org>,
open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] block/bio-integrity: fix a memory leak bug
On 7/11/19 1:22 PM, Wenwen Wang wrote:
> From: Wenwen Wang <wenwen@...uga.edu>
>
> In bio_integrity_prep(), a kernel buffer is allocated through kmalloc() to
> hold integrity metadata. Later on, the buffer will be attached to the bio
> structure through bio_integrity_add_page(), which returns the number of
> bytes of integrity metadata attached. Due to unexpected situations,
> bio_integrity_add_page() may return 0. As a result, bio_integrity_prep()
> needs to be terminated with 'false' returned to indicate this error.
> However, the allocated kernel buffer is not freed on this execution path,
> leading to a memory leak.
>
> To fix this issue, free the allocated buffer before returning from
> bio_integrity_prep().
Applied, thanks.
--
Jens Axboe
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