From: Eric Biggers <ebiggers@kernel.org>
To: Gao Xiang <gaoxiang25@huawei.com>
Cc: Chao Yu <yuchao0@huawei.com>,
linux-erofs@lists.ozlabs.org, Miao Xie <miaoxie@huawei.com>,
LKML <linux-kernel@vger.kernel.org>,
Lasse Collin <lasse.collin@tukaani.org>
Subject: Re: [PATCH 3/3] erofs: handle corrupted images whose decompressed size less than it'd be
Date: Tue, 25 Feb 2020 18:34:58 -0800 [thread overview]
Message-ID: <20200226023458.GB1053@sol.localdomain> (raw)
In-Reply-To: <20200226023011.103798-3-gaoxiang25@huawei.com>
On Wed, Feb 26, 2020 at 10:30:11AM +0800, Gao Xiang wrote:
> As Lasse pointed out, "Looking at fs/erofs/decompress.c,
> the return value from LZ4_decompress_safe_partial is only
> checked for negative value to catch errors. ... So if
> I understood it correctly, if there is bad data whose
> uncompressed size is much less than it should be, it can
> leave part of the output buffer untouched and expose the
> previous data as the file content. "
>
> Let's fix it now.
>
> Cc: Lasse Collin <lasse.collin@tukaani.org>
> Signed-off-by: Gao Xiang <gaoxiang25@huawei.com>
Shouldn't fixes like this have a Fixes tag and Cc stable?
- Eric
next prev parent reply other threads:[~2020-02-26 2:35 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-02-26 2:30 [PATCH 1/3] erofs: correct the remaining shrink objects Gao Xiang
2020-02-26 2:30 ` [PATCH 2/3] erofs: use LZ4_decompress_safe() for full decoding Gao Xiang
2020-03-03 9:49 ` Chao Yu
2020-02-26 2:30 ` [PATCH 3/3] erofs: handle corrupted images whose decompressed size less than it'd be Gao Xiang
2020-02-26 2:34 ` Eric Biggers [this message]
2020-02-26 2:40 ` Gao Xiang
2020-02-26 2:44 ` Gao Xiang
2020-03-03 9:51 ` Chao Yu
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