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 5A5183590D4; Wed, 3 Dec 2025 16:36:11 +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=1764779772; cv=none; b=fnN7EBdepy5X7XX63rGkgDug4BJlWxiy7LwtUxrTwINtRI7Nnd6LXGBmvWvge1lmkxfv+N5UIvcil4YF6rLb/1A4yZzE0uWp8kuMUqOfodMZ9B+EkjglNfw/dwYb9aUdJ30qM/76CQBBHrMiIt2pFqaYwu78jlOHjD0wq2Bl4d0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1764779772; c=relaxed/simple; bh=cPfWueQwGYAoljf1y8OscaRghY3WBfFkAGK6WRXkvPo=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=NUc3bGQ0/+NHka6P4IsGJYJ3maxCwKozgyAk6QVbMhq87tgyV8dck3Cef2/6YtAULzYBwfIkTZphOUQ9ihs55/IvTslb06GWVF1nKNIbhehmZtaOM9hyjMK42JBA+NvcTX8jKHCRKD3Gu5mQ6yluE5W7EGk9AKpXBRuwMJngt7M= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=yrCtxosc; 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="yrCtxosc" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 63062C4CEF5; Wed, 3 Dec 2025 16:36:11 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1764779771; bh=cPfWueQwGYAoljf1y8OscaRghY3WBfFkAGK6WRXkvPo=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=yrCtxoscE8GHiG1bWxAQNcjWlVfp78Aasqu2eiqOQC8y4gh6tdbc1GiWtOG7yJExn zaEuiAalQY+QpVsoztCmv8awfdVGoIAFlYL8gIHi7FGEObEgfTpojzb55ADMqO11N1 fMCgncAMx26B8BPNwsV2IxSS+90Uy24VBeKNXDGU= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Zilin Guan , "Steven Rostedt (Google)" , Sasha Levin Subject: [PATCH 6.1 324/568] tracing: Fix memory leaks in create_field_var() Date: Wed, 3 Dec 2025 16:25:26 +0100 Message-ID: <20251203152452.578511007@linuxfoundation.org> X-Mailer: git-send-email 2.52.0 In-Reply-To: <20251203152440.645416925@linuxfoundation.org> References: <20251203152440.645416925@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.1-stable review patch. If anyone has any objections, please let me know. ------------------ From: Zilin Guan [ Upstream commit 80f0d631dcc76ee1b7755bfca1d8417d91d71414 ] The function create_field_var() allocates memory for 'val' through create_hist_field() inside parse_atom(), and for 'var' through create_var(), which in turn allocates var->type and var->var.name internally. Simply calling kfree() to release these structures will result in memory leaks. Use destroy_hist_field() to properly free 'val', and explicitly release the memory of var->type and var->var.name before freeing 'var' itself. Link: https://patch.msgid.link/20251106120132.3639920-1-zilin@seu.edu.cn Fixes: 02205a6752f22 ("tracing: Add support for 'field variables'") Signed-off-by: Zilin Guan Signed-off-by: Steven Rostedt (Google) Signed-off-by: Sasha Levin --- kernel/trace/trace_events_hist.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/kernel/trace/trace_events_hist.c b/kernel/trace/trace_events_hist.c index c53be68bcd111..31d60758053d1 100644 --- a/kernel/trace/trace_events_hist.c +++ b/kernel/trace/trace_events_hist.c @@ -3210,14 +3210,16 @@ static struct field_var *create_field_var(struct hist_trigger_data *hist_data, var = create_var(hist_data, file, field_name, val->size, val->type); if (IS_ERR(var)) { hist_err(tr, HIST_ERR_VAR_CREATE_FIND_FAIL, errpos(field_name)); - kfree(val); + destroy_hist_field(val, 0); ret = PTR_ERR(var); goto err; } field_var = kzalloc(sizeof(struct field_var), GFP_KERNEL); if (!field_var) { - kfree(val); + destroy_hist_field(val, 0); + kfree_const(var->type); + kfree(var->var.name); kfree(var); ret = -ENOMEM; goto err; -- 2.51.0