From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (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 3126530EF7D; Sat, 30 May 2026 17:53:29 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1780163610; cv=none; b=RPdMUTsNAjAaOjMbSEPjqqtH5jSaIxZb5DB97s2uOEYA+F8OLZXUtfD/Hj0graWMpui+4jku8M/QUF0l8NveqdLeRoCMD9c4bKz7sIvIYcN8bVZbOpF2NEhFFGmSytlruPmPehoE7HJtaZFtg2aFtK2S7vpgWOl+9oLaqq6tBbg= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1780163610; c=relaxed/simple; bh=IVf59HmkctsbkKjNovB+8THHT7wWRRhTK8mDZiMfvMU=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=LezGY3YgZmJp2rr0vr992SZr8/nHn+6qeb4azlLwymRpn3IV1PkzPFVBTMN4zz2CJpnRuVrzZaO9MgqAtHQoHMOtG2h9IcPcNQLN2Rqpvzx6kJSYS3N/66X5lzKc573a/Djmj2jUNL09kfnGk3ENZK1pvRqxxptfVwNvFWDbRoc= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=BXnGVbrL; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="BXnGVbrL" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 760531F00893; Sat, 30 May 2026 17:53:28 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1780163609; bh=n8kZG0Dim0Y05762bIabJZpARB4Q2V7a1omT7HOnFlA=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=BXnGVbrLAONFKZnH73e9REXyxRUe88bpHiPtiHCwtcdvkT1sYY21GobmhIkprfVbR 9HXDuGG/tvAuhrFryIU/S/A3eOq84HECE18eElXuCVU6vCbFmPJOXpeflf2y6E6ujr EiuPV3fL/gZu1YDVGbjKPYOqczUH/17XRbrXx8DY= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, SeungJu Cheon , Takashi Iwai Subject: [PATCH 5.15 310/776] sound: ua101: fix division by zero at probe Date: Sat, 30 May 2026 18:00:24 +0200 Message-ID: <20260530160248.579689985@linuxfoundation.org> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260530160240.228940103@linuxfoundation.org> References: <20260530160240.228940103@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 5.15-stable review patch. If anyone has any objections, please let me know. ------------------ From: SeungJu Cheon commit d1f73f169c1014463b5060e3f60813e13ddc7b87 upstream. Add a missing sanity check for bNrChannels in detect_usb_format() to prevent a division by zero in playback_urb_complete() and capture_urb_complete(). USB core does not validate class-specific descriptor fields such as bNrChannels, so drivers must verify them before use. If a device provides bNrChannels = 0, frame_bytes becomes zero and is later used as a divisor in the URB completion handlers, leading to a kernel crash. Fixes: 63978ab3e3e9 ("sound: add Edirol UA-101 support") Cc: stable@vger.kernel.org Signed-off-by: SeungJu Cheon Link: https://patch.msgid.link/20260426111239.103296-1-suunj1331@gmail.com Signed-off-by: Takashi Iwai Signed-off-by: Greg Kroah-Hartman --- sound/usb/misc/ua101.c | 7 +++++++ 1 file changed, 7 insertions(+) --- a/sound/usb/misc/ua101.c +++ b/sound/usb/misc/ua101.c @@ -994,6 +994,13 @@ static int detect_usb_format(struct ua10 ua->capture.channels = fmt_capture->bNrChannels; ua->playback.channels = fmt_playback->bNrChannels; + if (!ua->capture.channels || !ua->playback.channels) { + dev_err(&ua->dev->dev, + "invalid channel count: capture %u, playback %u\n", + ua->capture.channels, ua->playback.channels); + return -EINVAL; + } + ua->capture.frame_bytes = fmt_capture->bSubframeSize * ua->capture.channels; ua->playback.frame_bytes =