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bh=PcA7XtyXGltk5H+OKUZ/7bSf2zntXwWFan/bkQ0o9cE=; b=nMSqzbZzX9/xIcSgQFQ9WikWFppvKIDoWUqk3COdeXGjLQ8fkttap/NtBHoqRsUj+0E+eK NL382xGfq/VqQZSBQQ70EdIyr0mDSk4d+LNaBfSIPc7DPCGQAKyH5PhlVpbcCZNT9hf1fA VIn5LdxB6oh+1qSCv0T79Ln04eqZrBY= From: Sven Eckelmann To: =?UTF-8?B?wq3rsJXsiJjsmYQgLyDtlZnsg50gLyDsu7Ttk6jthLDqs7XtlZnrtoA=?= Cc: b.a.t.m.a.n@lists.open-mesh.org, netdev@vger.kernel.org, marek.lindner@mailbox.org, sw@simonwunderlich.de, antonio@mandelbit.com, davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com, horms@kernel.org, Tejun Heo Subject: Re: [PATCH] batman-adv: fix DAT purge use-after-free on teardown Date: Tue, 26 May 2026 16:18:05 +0200 Message-ID: <10856691.nUPlyArG6x@ripper> In-Reply-To: References: <20260526064835.2233822-1-swan2718@snu.ac.kr> <14018241.uLZWGnKmhe@ripper> MIME-Version: 1.0 Content-Type: multipart/signed; boundary="nextPart2352248.iZASKD2KPV"; micalg="pgp-sha512"; protocol="application/pgp-signature" Message-ID-Hash: S7P4JFDYR4NGFKNLJHGPFDMQ5XJUR6ID X-Message-ID-Hash: S7P4JFDYR4NGFKNLJHGPFDMQ5XJUR6ID X-MailFrom: sven@narfation.org X-Mailman-Rule-Misses: dmarc-mitigation; no-senders; approved; loop; banned-address; header-match-b.a.t.m.a.n.lists.open-mesh.org-0; header-match-b.a.t.m.a.n.lists.open-mesh.org-1; header-match-b.a.t.m.a.n.lists.open-mesh.org-2; header-match-b.a.t.m.a.n.lists.open-mesh.org-3; emergency; member-moderation; nonmember-moderation; administrivia; implicit-dest; max-recipients; max-size; news-moderation; no-subject; digests; suspicious-header X-Mailman-Version: 3.3.10 Precedence: list List-Id: The list for a Better Approach To Mobile Ad-hoc Networking Archived-At: List-Archive: List-Help: List-Owner: List-Post: List-Subscribe: List-Unsubscribe: --nextPart2352248.iZASKD2KPV Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8"; protected-headers="v1" From: Sven Eckelmann Date: Tue, 26 May 2026 16:18:05 +0200 Message-ID: <10856691.nUPlyArG6x@ripper> MIME-Version: 1.0 On Tuesday, 26 May 2026 15:56:58 CEST =C2=AD=EB=B0=95=EC=88=98=EC=99=84 / = =ED=95=99=EC=83=9D / =EC=BB=B4=ED=93=A8=ED=84=B0=EA=B3=B5=ED=95=99=EB=B6=80= wrote: > Hi Sven, >=20 > You're right. I re-examined __cancel_work_sync() and confirmed that it > internally disables the work before flushing, so the re-queue race I > described does not exist. I'll withdraw this patch. >=20 > Thanks for the review. But you said that this was reported by syzkaller. I can't find the report i= n=20 the official list [1]. I am guessing you have a reproducer in a private=20 instance and tested with it. And if you tested your patch with it, you have= =20 found that your patch fixes it, right? Can you give us more information about this to let us figure out what is=20 actually going on? Regards, Sven [1] https://syzkaller.appspot.com/upstream/s/batman --nextPart2352248.iZASKD2KPV Content-Type: application/pgp-signature; name="signature.asc" Content-Description: This is a digitally signed message part. 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