linux-kernel - Re: [PATCH] btrfs: zlib: zero-initialize zlib workspace

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Message-ID: <20230124165921.GT11562@twin.jikos.cz>
Date:   Tue, 24 Jan 2023 17:59:21 +0100
From:   David Sterba <dsterba@...e.cz>
To:     Alexander Potapenko <glider@...gle.com>
Cc:     clm@...com, dsterba@...e.com, josef@...icpanda.com,
        linux-btrfs@...r.kernel.org, linux-kernel@...r.kernel.org,
        ebiggers@...nel.org,
        syzbot+14d9e7602ebdf7ec0a60@...kaller.appspotmail.com
Subject: Re: [PATCH] btrfs: zlib: zero-initialize zlib workspace

On Tue, Jan 24, 2023 at 12:32:34PM +0100, Alexander Potapenko wrote:
> KMSAN reports uses of uninitialized memory in zlib's longest_match()
> called on memory originating from zlib_alloc_workspace().
> This issue is known by zlib maintainers and is claimed to be harmless,
> but to be on the safe side we'd better initialize the memory.
> 
> Link: https://zlib.net/zlib_faq.html#faq36
> Reported-by: syzbot+14d9e7602ebdf7ec0a60@...kaller.appspotmail.com
> Signed-off-by: Alexander Potapenko <glider@...gle.com>

Added to misc-next, thanks.