From nobody Sun Feb 8 12:14:01 2026 Received: from m16.mail.163.com (m16.mail.163.com [117.135.210.5]) (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 DF9A22F12BB for ; Fri, 19 Dec 2025 07:43:31 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=117.135.210.5 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1766130215; cv=none; b=G5MBnHseUUGKboSJctNxFaFmPOio08ZwUF+4TOP8CXgpi6IGgczBoJGua5ahrkRIZatg2kXqb51LgoPuOHjsQr0VMBG9YuWZbmz7jgYxi6noLDdxucvreT720++puqU/LgovIwKzzklP1eHD2gXiBYYMzwPSnTjV9OplHphnWv8= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1766130215; c=relaxed/simple; bh=4nkIpQx/kcOd35h/QBxG7I2md901VJQr3kLibmZz/iI=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=o5qZn7GlTG+vzIEDREqobXhOycKY2hOaGEmRXfOQM4Kp/mPB4nP1E3ip1Z8FWW+0Gj1bShRDVGyAMoJ/XMHH2il2HxCsFN5DLyD7+6kN8RA4ivO2R465pAvszvY90HOoM/MHQflMeX71vR3HlGgHxQmLR/jgZ0rmLGgTEtaeR5g= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=163.com; spf=pass smtp.mailfrom=163.com; dkim=pass (1024-bit key) header.d=163.com header.i=@163.com header.b=QYFdxmOP; arc=none smtp.client-ip=117.135.210.5 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=163.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=163.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=163.com header.i=@163.com header.b="QYFdxmOP" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=163.com; s=s110527; h=From:To:Subject:Date:Message-ID:MIME-Version; bh=jv s0EDui5lz1TF1uIZ9gkaF5c3Y2j5uvMrhkKCIxrF4=; b=QYFdxmOPtqBtGlbebb tiqFeZS9ANembrIFaEHwG1AJYxzPrqOFIlsFPoHMP6m0uZLd9IzixCnDHu1cyL1E kP8beb4vkVfuZSaYgM15xKKuCZUxyfCIdQla4lZo5Ubwr52Qrk+qkF8QfLjsIdra gIRE1QGtn3/TTEqf5QhBaE4eY= Received: from ubuntu24-z.. (unknown []) by gzsmtp4 (Coremail) with SMTP id PygvCgA3BJbqAUVpKFv+Hw--.120S2; Fri, 19 Dec 2025 15:42:37 +0800 (CST) From: ranxiaokai627@163.com To: akpm@linux-foundation.org, vbabka@suse.cz, surenb@google.com, mhocko@suse.com, jackmanb@google.com, hannes@cmpxchg.org, ziy@nvidia.com, elver@google.com, andreyknvl@gmail.com, =osalvador@suse.de Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org, ran.xiaokai@zte.com.cn, ranxiaokai627@163.com Subject: [PATCH] mm/page_owner: fix memory leak in page_owner_stack_fops->release() Date: Fri, 19 Dec 2025 07:42:32 +0000 Message-ID: <20251219074232.136482-1-ranxiaokai627@163.com> X-Mailer: git-send-email 2.43.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-CM-TRANSID: PygvCgA3BJbqAUVpKFv+Hw--.120S2 X-Coremail-Antispam: 1Uf129KBjvdXoW7JFy3uw47tr1UWry8tw48tFb_yoWfuFcE9w 429rykCr4Yy39xZ348uan3Xr42y34DCr9YyF1qgFW7ta48tayfXrn2vwsxJr1DXr4UKr43 Krn3ZF15Jw1fWjkaLaAFLSUrUUUUjb8apTn2vfkv8UJUUUU8Yxn0WfASr-VFAUDa7-sFnT 9fnUUvcSsGvfC2KfnxnUUI43ZEXa7sRtuc_UUUUUU== X-CM-SenderInfo: xudq5x5drntxqwsxqiywtou0bp/xtbC7g4nc2lFAe48GAAA3T Content-Type: text/plain; charset="utf-8" From: Ran Xiaokai The page_owner_stack_fops->open() callback invokes seq_open_private(), therefore its corresponding ->release() callback must call seq_release_priv= ate(). Otherwise it will cause a memory leak of struct stack_print_ctx. Fixes: 765973a098037 ("mm,page_owner: display all stacks and their count") Signed-off-by: Ran Xiaokai Acked-by: Michal Hocko Acked-by: Vlastimil Babka --- mm/page_owner.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/mm/page_owner.c b/mm/page_owner.c index 27d19f01009c..b6a394a130ec 100644 --- a/mm/page_owner.c +++ b/mm/page_owner.c @@ -952,7 +952,7 @@ static const struct file_operations page_owner_stack_fo= ps =3D { .open =3D page_owner_stack_open, .read =3D seq_read, .llseek =3D seq_lseek, - .release =3D seq_release, + .release =3D seq_release_private, }; =20 static int page_owner_threshold_get(void *data, u64 *val) --=20 2.25.1