linux-kernel - Re: [PATCH] ext4: fix another off-by-one fsmap error on 1k block filesystems

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Message-Id: <167824999281.2129363.10471803960046031746.b4-ty@mit.edu>
Date:   Tue,  7 Mar 2023 23:33:21 -0500
From:   "Theodore Ts'o" <tytso@....edu>
To:     "Darrick J. Wong" <djwong@...nel.org>
Cc:     "Theodore Ts'o" <tytso@....edu>, linux-kernel@...r.kernel.org,
        Tudor Ambarus <tudor.ambarus@...aro.org>,
        Jun Nie <jun.nie@...aro.org>, Lee Jones <joneslee@...gle.com>,
        linux-ext4@...r.kernel.org, adilger.kernel@...ger.ca
Subject: Re: [PATCH] ext4: fix another off-by-one fsmap error on 1k block filesystems

On Thu, 16 Feb 2023 10:55:48 -0800, Darrick J. Wong wrote:
> From: Darrick J. Wong <djwong@...nel.org>
> 
> Apparently syzbot figured out that issuing this FSMAP call:
> 
> struct fsmap_head cmd = {
> 	.fmh_count	= ...;
> 	.fmh_keys	= {
> 		{ .fmr_device = /* ext4 dev */, .fmr_physical = 0, },
> 		{ .fmr_device = /* ext4 dev */, .fmr_physical = 0, },
> 	},
> ...
> };
> ret = ioctl(fd, FS_IOC_GETFSMAP, &cmd);
> 
> [...]

Applied, thanks!

[1/1] ext4: fix another off-by-one fsmap error on 1k block filesystems
      commit: c993799baf9c5861f8df91beb80e1611b12efcbd

Best regards,
-- 
Theodore Ts'o <tytso@....edu>