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 B99E13815F4; Thu, 12 Mar 2026 20:27:50 +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=1773347270; cv=none; b=CD7yfi5lKmYWJaVuhLbdSYntflFfzklBVVAIfXFzP07qARBh5/BiRUVvUv0i/+P8+i65yx7qQ9v9hoRBuFFAEfdts0jOyfU/ggxN9hArxIe37Cyi86s9C8hyAzgDr+2QViJYqQJm0AuW3Rxtqmrq1jQkBM1FGbVOSF0NNJyzi08= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1773347270; c=relaxed/simple; bh=oUAB3NcqHf8W1TVlpT7YQOvfW97sMTuYsw+dOSLgxnA=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=RAGnrB2nyrFoclewPjXf4NaQmhwGQNllGvyZaZoC0AQ1LKJCU3dG3qLW1g/o76ceYF9/Dcd4EmEGkTazFc45leTyjfeKgQe3RAJ6ADeXXqesAKaEWOvalxw014g11Y9VBwVgLJxque4jS01qeaOWBCoVCJXOPM2PXRxTnD2/mZg= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=yEtXvNHj; 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="yEtXvNHj" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 011AFC4CEF7; Thu, 12 Mar 2026 20:27:49 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1773347270; bh=oUAB3NcqHf8W1TVlpT7YQOvfW97sMTuYsw+dOSLgxnA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=yEtXvNHjttNu5JHviOpIPdNt0GGxXDubKV5U3xW/qpNYqRAsTM2bjsFUtNVnem1jS f6efwV3hxwiDCz8KXkoLGKa+HSlWKRsR3A2arEzkP3a0Yc1k2j6EYPXSZywfRUC4hk P0XHBBCIbdeiQFgoWTKRaa5dAjk59nAARnsWYpJA= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Miaoqian Lin , Masami Hiramatsu , Mathieu Desnoyers , "Steven Rostedt (Google)" , Guenter Roeck , Sasha Levin Subject: [PATCH 6.12 248/265] tracing: Add NULL pointer check to trigger_data_free() Date: Thu, 12 Mar 2026 21:10:35 +0100 Message-ID: <20260312201027.296856742@linuxfoundation.org> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260312201018.128816016@linuxfoundation.org> References: <20260312201018.128816016@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: Guenter Roeck [ Upstream commit 457965c13f0837a289c9164b842d0860133f6274 ] If trigger_data_alloc() fails and returns NULL, event_hist_trigger_parse() jumps to the out_free error path. While kfree() safely handles a NULL pointer, trigger_data_free() does not. This causes a NULL pointer dereference in trigger_data_free() when evaluating data->cmd_ops->set_filter. Fix the problem by adding a NULL pointer check to trigger_data_free(). The problem was found by an experimental code review agent based on gemini-3.1-pro while reviewing backports into v6.18.y. Cc: Miaoqian Lin Cc: Masami Hiramatsu Cc: Mathieu Desnoyers Cc: Steven Rostedt (Google) Link: https://patch.msgid.link/20260305193339.2810953-1-linux@roeck-us.net Fixes: 0550069cc25f ("tracing: Properly process error handling in event_hist_trigger_parse()") Assisted-by: Gemini:gemini-3.1-pro Signed-off-by: Guenter Roeck Signed-off-by: Steven Rostedt (Google) Signed-off-by: Sasha Levin --- kernel/trace/trace_events_trigger.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/kernel/trace/trace_events_trigger.c b/kernel/trace/trace_events_trigger.c index d5dbda9b0e4b0..1e4e699c25478 100644 --- a/kernel/trace/trace_events_trigger.c +++ b/kernel/trace/trace_events_trigger.c @@ -19,6 +19,9 @@ static DEFINE_MUTEX(trigger_cmd_mutex); void trigger_data_free(struct event_trigger_data *data) { + if (!data) + return; + if (data->cmd_ops->set_filter) data->cmd_ops->set_filter(NULL, data, NULL); -- 2.51.0