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 AB2E33C09EB; Tue, 12 May 2026 17:52:17 +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=1778608337; cv=none; b=MOhbEs9tPHbJZU/VDSMeT29mveWyVt+CKZrH+veBcxcM/AK60IqkZMpUkP2EAXw7bPP0cWqgw5Ah/RrkLYMa10Nx06964S3r6GFtyMLRlo1aIblg3v6bPUxQaOM/Xemyovewa0ssdhl/pssjAri/FFMUH0IvhHlAt7CxxV4SqM0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1778608337; c=relaxed/simple; bh=HGro0a5lHzTYJlTATbjnpTkNRpfyI/WVvZbUm0878QQ=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=g2zARzyeI6nFNDuVKHM9sNmRMHjIY0dEupHgA6cXRhPxtwxV3JGD6yV+3d8qA/soBWSkmWqeNhUb0MbupzlejZ30n81D3YdI9R02X2bfH3D3FLp0yTEkLGGkBw1VNfmhbqR80uhh+iY3RsEriZQJeKXM+s6Aw9iebdM6j1hT3J0= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=oHIEBGOQ; 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="oHIEBGOQ" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 425C6C2BCC7; Tue, 12 May 2026 17:52:17 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1778608337; bh=HGro0a5lHzTYJlTATbjnpTkNRpfyI/WVvZbUm0878QQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=oHIEBGOQM8/aySN+rd3l+SvoyktDpuPgoOn6+oc/monvTVbxzfOB+st92UYGK4aWb g61pg/0ISUVY6OmJkx2IFc9wrBQQPDve51Ff+hT3C7kCHSDzOg+1ha5zKMIti3Qt6m dJ22eSmHc4HNt1k7r6mNXSDhx53tNZ9cdT0pmkw8= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Takashi Iwai Subject: [PATCH 6.18 041/270] ALSA: usb-audio: Avoid potential endless loop in convert_chmap_v3() Date: Tue, 12 May 2026 19:37:22 +0200 Message-ID: <20260512173939.319090072@linuxfoundation.org> X-Mailer: git-send-email 2.54.0 In-Reply-To: <20260512173938.452574370@linuxfoundation.org> References: <20260512173938.452574370@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 6.18-stable review patch. If anyone has any objections, please let me know. ------------------ From: Takashi Iwai commit 6e7247d8f5fefeceb0bb9cc80a5388a636b219cd upstream. The convert_chmap_v3() has a loop with its increment size of cs_desc->wLength, but we forgot to validate cs_desc->wLength itself, which may lead to potential endless loop by a malformed descriptor. Add a proper size check to abort the loop for plugging the hole. Fixes: ecfd41166b72 ("ALSA: usb-audio: Validate UAC3 cluster segment descriptors") Cc: Link: https://patch.msgid.link/20260427152224.15276-1-tiwai@suse.de Signed-off-by: Takashi Iwai Signed-off-by: Greg Kroah-Hartman --- sound/usb/stream.c | 2 ++ 1 file changed, 2 insertions(+) --- a/sound/usb/stream.c +++ b/sound/usb/stream.c @@ -352,6 +352,8 @@ snd_pcm_chmap_elem *convert_chmap_v3(str if (len < sizeof(*cs_desc)) break; cs_len = le16_to_cpu(cs_desc->wLength); + if (cs_len < sizeof(*cs_desc)) + break; if (len < cs_len) break; cs_type = cs_desc->bSegmentType;