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 99EB52EA16D; Tue, 22 Jul 2025 14:10:40 +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=1753193440; cv=none; b=rA10cFHtPUR+m7gMFreDlHm4tx05+k8HDnyW7Pmlt2+oJ/V69dzzyW5BY5Y8iha/kk7xi9sIK84mvkhv51WhlGhF3G+i1R1ya6RuYpXMB4d0suq4i8OpOYakvtknzkcSi0DQI7SauVcT7R4ouWYmqEITH4iUsq2Y4Na3rKEhu/4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1753193440; c=relaxed/simple; bh=t7ldgaEhcIsBvc/wt+ehFVeQwS3ubJxiuQ0I/h0jU6U=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=FTLzxRQbUnYqLVn+0jY9MsYWFFEvm148PL3IdvnpsE30O2rEiUZSHzWTRjH6B8MJzW9INGcn7/SiAOLAkgWjkQVU7Zp02Y/SQQhgVnXF6UvTHGy5fSc3xnhkZxGjjX5BEfdw+mufOM9LcUH37pDZ1PsZouo976UUGn3HxGl5B74= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=PSLEac5I; 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="PSLEac5I" Received: by smtp.kernel.org (Postfix) with ESMTPSA id C0D4CC4CEEB; Tue, 22 Jul 2025 14:10:39 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1753193440; bh=t7ldgaEhcIsBvc/wt+ehFVeQwS3ubJxiuQ0I/h0jU6U=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=PSLEac5IK000kUGDBHKGeeebaHAZcojuE3nYIRZK/WEqT95UA4HdQdLL2FL7gjjTB MRSSHu5FnSYsTWg6vK+5quh4By8IMep0TtX+8VW1/1vgGE0OAThl1vApTL7u+AGu78 9YIFPGv+eN3RXgsCPHKRj5cA1ZI1BGovVgmRPkNY= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Ian Abbott Subject: [PATCH 6.15 092/187] comedi: comedi_test: Fix possible deletion of uninitialized timers Date: Tue, 22 Jul 2025 15:44:22 +0200 Message-ID: <20250722134349.163382340@linuxfoundation.org> X-Mailer: git-send-email 2.50.1 In-Reply-To: <20250722134345.761035548@linuxfoundation.org> References: <20250722134345.761035548@linuxfoundation.org> User-Agent: quilt/0.68 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 6.15-stable review patch. If anyone has any objections, please let me know. ------------------ From: Ian Abbott commit 1b98304c09a0192598d0767f1eb8c83d7e793091 upstream. In `waveform_common_attach()`, the two timers `&devpriv->ai_timer` and `&devpriv->ao_timer` are initialized after the allocation of the device private data by `comedi_alloc_devpriv()` and the subdevices by `comedi_alloc_subdevices()`. The function may return with an error between those function calls. In that case, `waveform_detach()` will be called by the Comedi core to clean up. The check that `waveform_detach()` uses to decide whether to delete the timers is incorrect. It only checks that the device private data was allocated, but that does not guarantee that the timers were initialized. It also needs to check that the subdevices were allocated. Fix it. Fixes: 73e0e4dfed4c ("staging: comedi: comedi_test: fix timer lock-up") Cc: stable@vger.kernel.org # 6.15+ Signed-off-by: Ian Abbott Link: https://lore.kernel.org/r/20250708130627.21743-1-abbotti@mev.co.uk Signed-off-by: Greg Kroah-Hartman --- drivers/comedi/drivers/comedi_test.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/drivers/comedi/drivers/comedi_test.c +++ b/drivers/comedi/drivers/comedi_test.c @@ -790,7 +790,7 @@ static void waveform_detach(struct comed { struct waveform_private *devpriv = dev->private; - if (devpriv) { + if (devpriv && dev->n_subdevices) { timer_delete_sync(&devpriv->ai_timer); timer_delete_sync(&devpriv->ao_timer); }