From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from out203-205-221-173.mail.qq.com (out203-205-221-173.mail.qq.com [203.205.221.173]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id E11412C21F7 for ; Thu, 9 Apr 2026 13:35:41 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=203.205.221.173 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1775741745; cv=none; b=pPD2ZA48q7RnJN5bgy1MpI6PQ7WIAYoNqu1xe2IDuy9tW8738vB9AW5aHYeUqP575jtruwvskLeoUBnBGtG20HHxAVUSJ9v2XOmCkjnw+UEEt9xZPpTRASBnfSMzYDY0DG2655+OZhDxaCkGKc86RA5SMzqMwzX07vWlOfSGA8s= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1775741745; c=relaxed/simple; bh=lA2jQ8ztZIXdb7T5/cv9g++26O/RVpI0YOYU7RaDyg0=; h=Message-ID:From:To:Cc:Subject:Date:In-Reply-To:References: MIME-Version; b=FnwPbmtUQrfKTTTzNU/Ut6LOJZCkMHcCkdagHMrLr2EK+wXbrIKJRnucxQ7p7BV6qieCe1x6HCEk06v3fE9eEx/85+JQoKA7XQqKYRlMCFakBC/6eUYKcgHkZ5hZ+KT/t5WxcvvQS7C5Y0SiREPOeLx1zxbzv6AMPymQK9RGkww= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=qq.com; spf=pass smtp.mailfrom=qq.com; dkim=pass (1024-bit key) header.d=qq.com header.i=@qq.com header.b=fkqHjPRs; arc=none smtp.client-ip=203.205.221.173 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=qq.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=qq.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=qq.com header.i=@qq.com header.b="fkqHjPRs" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=qq.com; s=s201512; t=1775741734; bh=6YdjQ568Oi8ysDf1Q3J0CQelZI9uX/jLLx+tnILKSmk=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=fkqHjPRsVlzGozM52pM1Gl5Zj4jZtoLHR3iTPcwfalN0Zra2hW5qcSbEcLLAJ8/CJ yqLquZBUEj+UIguy/hcPKyHLSOiOE20DsCqIevpMTYoqgl+EjYzrxpn05mIbvlEek2 ZFZS7Y7IlfOKXVkMc7CXmwBPPUjAfD6nHHE55As0= Received: from lxu-ped-host.. ([111.198.231.89]) by newxmesmtplogicsvrszb51-1.qq.com (NewEsmtp) with SMTP id 8DF8B44D; Thu, 09 Apr 2026 21:35:31 +0800 X-QQ-mid: xmsmtpt1775741731t21m9qojx Message-ID: X-QQ-XMAILINFO: OSwfMg0kWYgsWU20IwbvoVqvQVXCKUbF03DalNymiftjAqHwtsrrJStHu0hbWT v2KsBmamcky4bOzqwZ0GyAluqv8pDNPNNLnppWeauEtZZRQZ3W0KGs+MzNn+1ijuCiHkJVUJmGEX Vcevnmc1Gh7eFCU9S+mruhUObimuIrr7UbFh4MvP/rJwxulpk/mYGkt4hesb7UeFTAtlHZkvYFZs yYQ1/qXRmLX6/epNc8445+csq0l/Ttxu4VL52FXnGrxuibJa1UdijyOyPfGsIAXY5aoHlOt0vRWW yI92bY3Gt62XcCwEbHzqhE1V6/qaxp8vfsNpz79EAZWeAoHQYtWQAgY1oFdUtE4pN1FGu+TnNECE QQ8RoisTj7c5EKX/B2HMo7TmkUpLNBHrEFTAWp2Qxe/E7a9uiyBy2HmYz0d6+P0vpVbr/ehs9c+L Bxqkx4Fd8sYHZLz0wTizaTR+cF7VHRKHkGHyBuPhxGlf6aYFu85OdfFVDMul2lE5vcqa54+/tNCk Y3G/NcaiC1CdvC4TIOgXkk6dlGGiSjzt4kezWX+hVQAO/PwguNbi0spGmKwr5wyq4eHLFDDdP+g2 /EswA48rXpIGf45JKMYUxFX0B6zkaRAR0d0gqBTTh32GGpiMO1Jg0HxGkskKfHgoeik+EIu+6e4T poPari3iHfzxuONbRNFpiPLbgGPVF69w76wGT17R82jmyUjcA1L6yIaTB0yMKnozAeSnpnMXVP2x fv5MM3axWP0stAIuD6SYnIayoOlKraqNWhgZiSZZalU2BWXuJ0A3X3bMpMg8fY/9CDhNyrIJ1VFB /D4yTKK2rxp8O8m6ojeoV+zsLsQ67PotMcgvsXCG2LGg3KrNzRXnQoFLQIxHWf/H4BeGyvPMuGwd hM7gOGUGFhxpwuQOBMZX1SMbdoZUy9yqCJVzq1uu4tEjkVcTDr0hd8hjeMucI5HCvJjwyk5XdGWv eZnny9BulXrKC0kRalvcSHFK/HQJ1DmtQ4cxUJArd2vJRhE9lDBPeTPzdrNJiKdPg2h3s5RQM= X-QQ-XMRINFO: Nq+8W0+stu50tPAe92KXseR0ZZmBTk3gLg== From: Edward Adam Davis To: syzbot+33e571025d88efd1312c@syzkaller.appspotmail.com Cc: linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com Subject: Re: [syzbot] [cgroups?] KASAN: slab-use-after-free Read in pressure_write Date: Thu, 9 Apr 2026 21:35:32 +0800 X-OQ-MSGID: <20260409133531.108705-2-eadavis@qq.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <69d779b0.a00a0220.468cb.0018.GAE@google.com> References: <69d779b0.a00a0220.468cb.0018.GAE@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit #syz test diff --git a/kernel/cgroup/cgroup.c b/kernel/cgroup/cgroup.c index 4ca3cb993da2..5a34bd70ef7b 100644 --- a/kernel/cgroup/cgroup.c +++ b/kernel/cgroup/cgroup.c @@ -4280,8 +4280,10 @@ static void cgroup_file_release(struct kernfs_open_file *of) if (cft->release) cft->release(of); put_cgroup_ns(ctx->ns); + mutex_lock(&of->mutex); kfree(ctx); of->priv = NULL; + mutex_unlock(&of->mutex); } static ssize_t cgroup_file_write(struct kernfs_open_file *of, char *buf,