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 E924F352FEC; Tue, 26 Aug 2025 14:28:29 +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=1756218510; cv=none; b=MzGEJyTSYRPeU5lmmcl7KJukb84I8+nCz0b/BUgqZSQiy8v8E8yoxSORdsfHoKXplneVZHrRGCmOHLhuKzw/ZSGUWFC7VdN2NEbD0e+fJ78NnEPp6jKye9DtFVa4i4eRRTN9jdK3Rs0/dJfQ9O5O8uxUNEC6xeYfrnvGGhB6TB8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1756218510; c=relaxed/simple; bh=LiRvn+o7xchiFniUR8aRwekq2RI331iT6F3ZaHjbbqU=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=FWZ6H6lD1NaysoNK2vzR5xFDs6aGpipLHJyM4DSBP9FLrNXc2UjvqQcL7cmpn500MU2glFX3ExBII62r2fEUpbIS99m3d2ILIOKv0LCGC1ZnIQopzXYjz67+Z3QSQmM3LSBPOv/clz5pGzviU49cpFPhCTkAnz7JZdyBJtEvMTU= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=J60IztIx; 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="J60IztIx" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 6D4DEC4CEF1; Tue, 26 Aug 2025 14:28:29 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1756218509; bh=LiRvn+o7xchiFniUR8aRwekq2RI331iT6F3ZaHjbbqU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=J60IztIxD+ssHXWw3eUtspgeWmcchcdeWlqyE+NH9OHP58W4iL7Xc7oXaB0RHMgCG 4HKHizsI6obHhalRJJ1F3ktinl+8oD5jeiZAC9DqJUbfIec8cNb43P772lp0xiyPuR Gi3CyBh4zgTFfrVRIhTYALO7CelcJ+n3nlMvQA6g= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Ian Abbott Subject: [PATCH 5.4 028/403] comedi: das6402: Fix bit shift out of bounds Date: Tue, 26 Aug 2025 13:05:54 +0200 Message-ID: <20250826110906.581409184@linuxfoundation.org> X-Mailer: git-send-email 2.50.1 In-Reply-To: <20250826110905.607690791@linuxfoundation.org> References: <20250826110905.607690791@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 5.4-stable review patch. If anyone has any objections, please let me know. ------------------ From: Ian Abbott commit 70f2b28b5243df557f51c054c20058ae207baaac upstream. When checking for a supported IRQ number, the following test is used: /* IRQs 2,3,5,6,7, 10,11,15 are valid for "enhanced" mode */ if ((1 << it->options[1]) & 0x8cec) { However, `it->options[i]` is an unchecked `int` value from userspace, so the shift amount could be negative or out of bounds. Fix the test by requiring `it->options[1]` to be within bounds before proceeding with the original test. Valid `it->options[1]` values that select the IRQ will be in the range [1,15]. The value 0 explicitly disables the use of interrupts. Fixes: 79e5e6addbb1 ("staging: comedi: das6402: rewrite broken driver") Cc: stable@vger.kernel.org # 5.13+ Signed-off-by: Ian Abbott Link: https://lore.kernel.org/r/20250707135737.77448-1-abbotti@mev.co.uk Signed-off-by: Greg Kroah-Hartman --- drivers/staging/comedi/drivers/das6402.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) --- a/drivers/staging/comedi/drivers/das6402.c +++ b/drivers/staging/comedi/drivers/das6402.c @@ -569,7 +569,8 @@ static int das6402_attach(struct comedi_ das6402_reset(dev); /* IRQs 2,3,5,6,7, 10,11,15 are valid for "enhanced" mode */ - if ((1 << it->options[1]) & 0x8cec) { + if (it->options[1] > 0 && it->options[1] < 16 && + (1 << it->options[1]) & 0x8cec) { ret = request_irq(it->options[1], das6402_interrupt, 0, dev->board_name, dev); if (ret == 0) {