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Tue, 20 Oct 2026 11:05:06 +0000 (UTC) Received: from onestero-thinkpadp1gen7.tpbc.csb (headnet04.pony-001.prod.iad2.dc.redhat.com [10.2.32.116]) by mx-prod-int-06.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with SMTP id 8D09318002B1; Tue, 20 Oct 2026 11:05:02 +0000 (UTC) Received: by onestero-thinkpadp1gen7.tpbc.csb (nbSMTP-1.00) for uid 13628 oleg@redhat.com; Tue, 20 Oct 2026 13:05:05 +0200 (CEST) Date: Tue, 20 Oct 2026 13:05:01 +0200 From: Oleg Nesterov To: Joel Granados Cc: Allison Henderson , kernel test robot , oe-lkp@lists.linux.dev, lkp@intel.com, linux-kernel@vger.kernel.org, linux-m68k@lists.linux-m68k.org, linux-s390@vger.kernel.org, linux-fsdevel@vger.kernel.org, netdev@vger.kernel.org, wireguard@lists.zx2c4.com, rds-devel@oss.oracle.com Subject: Re: [linus:master] [sysctl] 8d75c338f0: BUG:KASAN:slab-use-after-free_in_touch_wq_lockdep_map Message-ID: References: <202610190310.9737b2e3-lkp@intel.com> <42964fa071bd8dcafd418c89be6d66856def4dc5.camel@kernel.org> X-Mailing-List: linux-fsdevel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-Scanned-By: MIMEDefang 3.4.1 on 10.30.177.93 On 10/20, Joel Granados wrote: > > On Mon, Oct 19, 2026 at 12:52:58PM -0700, Allison Henderson wrote: > > > > CONFIG_SYSCTL=n. A simpler fix might be to just handle the NULL at the > > three call sites, e.g.: > > > > rds_sysctl_reg_table = > > register_net_sysctl(&init_net, "net/rds", rds_sysctl_rds_table); > > if (!rds_sysctl_reg_table && IS_ENABLED(CONFIG_SYSCTL)) > > return -ENOMEM; > > > > Remember to NULL check rds_sysctl_reg_table in rds_sysctl_exit(). You > might hit another UAF on exit if you don't. Why? unregister_sysctl_table(header) does nothing if header == NULL. Oleg.