linux-kernel - Re: [PATCH v2] block/bio-integrity: fix a memory leak bug

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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