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Fri, 16 Oct 2026 12:27:54 -0400 (EDT) Date: Fri, 16 Oct 2026 18:27:58 +0200 From: Greg KH To: Nicolai Buchwitz Cc: stable@vger.kernel.org, sashal@kernel.org, technoboy85@gmail.com, hirofumi@mail.parknet.co.jp, brauner@kernel.org Subject: Re: Please backport FAT end-of-directory fix to 6.18 and 6.12 Message-ID: <2026101626-tattling-mutation-26ee@gregkh> References: <96dbd7d103fa6df33b0bbd492e309bd7@tipi-net.de> Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <96dbd7d103fa6df33b0bbd492e309bd7@tipi-net.de> On Fri, Oct 16, 2026 at 02:25:02PM +0200, Nicolai Buchwitz wrote: > Hi, > > Please consider backporting upstream commit > > 6a2875517c778ac1111b6920e94cbab91cda8724 > fat: stop reading directory entries past the end-of-directory marker > > to 6.18.y and 6.12.y, and any other affected supported stable branches. > > The fix prevents directory traversal from interpreting residual data > after the FAT end-of-directory marker as real directory entries, > resulting in bogus filenames and I/O errors. > > This affects FAT16 CompactFlash media written by devices such as the > Psion Series 7/netBook running EPOC32. It does not apply cleanly to 6.12.y so please provide a working version for there, and older kernels, if you wish to see it applied there. thanks, greg k-h