From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 6011D288C2D; Tue, 6 Jan 2026 17:38:39 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1767721119; cv=none; b=nlFcPp1cgW1TrAtewSVjqvPU56gCUenqq2mPRcHMneGRa46N98oARSiTOxN1SmsMu0fMlpGh80bGeFL4awNmzD2z0ciCwfW4uvuGkxwtyolEDjB+9jeMgHMOx8/V+kT+mIN9XavmvS3zKCqpYZJORFKX9v07Gptmy2aq2Nx88Ss= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1767721119; c=relaxed/simple; bh=n+47NVzc0nHQBiStI77/MJm+1tznnsXv8eqiW9CGCLM=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=Q6PZ+nd2YghFkJ/4gIg2pB828A+0QxhB9RVVdG5Nwp0QVZ8mB/aOXcj0Gs4knTWtzbVvVSHgVQf0wof3Rgz/FA3OzRmSNlBsiV1Tf1EDLXGhE+zTE0FGTsh8vDVItgRPU/qK2D1BYkDa8LSBSYCi3P1fTeoDh8NuNSQ2ZB3XOF8= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=nrEIb4fp; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="nrEIb4fp" Received: by smtp.kernel.org (Postfix) with ESMTPSA id DDF26C116C6; Tue, 6 Jan 2026 17:38:38 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1767721119; bh=n+47NVzc0nHQBiStI77/MJm+1tznnsXv8eqiW9CGCLM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=nrEIb4fpx7Xyf646ljwJ7SM+GOlzUUELMT6QWlcvmLuN4fRKMYYSKw/Z8nXIvO4Vs K9jm+r6I/Z4CxVakfWOpbiYN/Ejjf4mJSI5II+gik7l+ecWJxAGhjkg90Go0eOC3G/ ROvPc87XQHfvKjv6xOfFnMWUmMm/3w7zrfl/Z1xw= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Ran Xiaokai , Michal Hocko , Vlastimil Babka , Andrey Konovalov , Brendan Jackman , Johannes Weiner , Marco Elver , Suren Baghdasaryan , Zi Yan , Andrew Morton Subject: [PATCH 6.12 441/567] mm/page_owner: fix memory leak in page_owner_stack_fops->release() Date: Tue, 6 Jan 2026 18:03:43 +0100 Message-ID: <20260106170507.666343896@linuxfoundation.org> X-Mailer: git-send-email 2.52.0 In-Reply-To: <20260106170451.332875001@linuxfoundation.org> References: <20260106170451.332875001@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.12-stable review patch. If anyone has any objections, please let me know. ------------------ From: Ran Xiaokai commit a76a5ae2c6c645005672c2caf2d49361c6f2500f upstream. The page_owner_stack_fops->open() callback invokes seq_open_private(), therefore its corresponding ->release() callback must call seq_release_private(). Otherwise it will cause a memory leak of struct stack_print_ctx. Link: https://lkml.kernel.org/r/20251219074232.136482-1-ranxiaokai627@163.com Fixes: 765973a09803 ("mm,page_owner: display all stacks and their count") Signed-off-by: Ran Xiaokai Acked-by: Michal Hocko Acked-by: Vlastimil Babka Cc: Andrey Konovalov Cc: Brendan Jackman Cc: Johannes Weiner Cc: Marco Elver Cc: Suren Baghdasaryan Cc: Zi Yan Cc: Signed-off-by: Andrew Morton Signed-off-by: Greg Kroah-Hartman --- mm/page_owner.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/mm/page_owner.c +++ b/mm/page_owner.c @@ -933,7 +933,7 @@ static const struct file_operations page .open = page_owner_stack_open, .read = seq_read, .llseek = seq_lseek, - .release = seq_release, + .release = seq_release_private, }; static int page_owner_threshold_get(void *data, u64 *val)