From patchwork Tue Oct 8 15:40:05 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Luiz Augusto von Dentz X-Patchwork-Id: 833673 Received: from mail-ot1-f41.google.com (mail-ot1-f41.google.com [209.85.210.41]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 91CB0DF71 for ; Tue, 8 Oct 2024 15:40:13 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.210.41 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1728402015; cv=none; b=m3RVhz3jbb+ecFc5EaWI+AzEzeDRZp/ax7QARkgdEJSkJSTAGLJhgF7H/Id4XBipLhivuhN9mFzxL7q63gboz2Luchsc4rAEeduAfrFEXLiNP2+eXRWc60Aaq0RncfQFzB05ickshYNqBEOAjhU3LMmmDMA9VY9Pexe8GvZ0R5M= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1728402015; c=relaxed/simple; bh=9ogav7tvCq3mr4R4Qtr3XDeaG07xIixxnGkZK9Lejfc=; h=From:To:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=WP/h+vgx11d5unpu/6RRYy1FAMwgRy2YTUlPCT2Q2H7zx1cL44P3QYE96jdKbuHURyiGpzmGliiTO/B1qHTeBY7qbY36Wz1/jLGLwi4CtUgjsmdoNi1q/Hhy7sj2vJsI7pWLSJ03tk2L2/s+80+PuA9HdBHBplb+j/yKEoOo3Zs= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=NJNw6bIw; arc=none smtp.client-ip=209.85.210.41 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="NJNw6bIw" Received: by mail-ot1-f41.google.com with SMTP id 46e09a7af769-710e489860bso2994564a34.1 for ; Tue, 08 Oct 2024 08:40:13 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1728402011; x=1729006811; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:to:from:from:to:cc:subject:date:message-id :reply-to; bh=13TgSGIvfwmAijIF7qwuCiqdeSBpqVT2dwtZm/OOmqQ=; b=NJNw6bIwt7dRHKAZXK0CC10TcLeNVpT5IdiOjqs4yshYWEc2GaWRhcdJH6unYpefdA bMuMZe4mYHKe0UteHMORd9m/LTSBuuxt8U/X6h25Q8RWReahr3tLPuK8JafXB0I4mxAc FFGOHKfzK+ETWN++fgah3+ETv1gV2DMtfQl48i/M3E9xxTK2eqOiRKlrrp2/vqqyGftW ltgZ/2CnmQzbpQcoilTlyNrTiS/OFYHhcB4G8zMtpEDybEpfIUx0dyqFjWr/TbmsHJhe M8jZJ/BaoS790JpbabCef/yrtoBxpC+A12PbXPe7a896G+E0fVi3UVF+yJkFBDw3k5qu CFhQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1728402011; x=1729006811; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=13TgSGIvfwmAijIF7qwuCiqdeSBpqVT2dwtZm/OOmqQ=; b=pwug6B7cMZtCcGc9sTvob1u7Nib74+vDP5Dvcg6WBR+EuqWAgDOwRZqYQFlF3XixaG 6ltbnldweoIvWkW1WOX1dRIzqHcvdF4OJDR3wSTZPdnp9hYgVaf0UXiIF2iBljZzqSxZ 6RZNdLN44PoDS7vmoIplXRdVoLSNUNXweau8el6k1C0+SNcQ2WZWf0qvFtnzqJY02Lrc nDY5FvygNEun+I10OMuN6jJOv81o+G3DS4AzLMZDKHG0/2FEaJsCssHBdgF7RhBxCkxh Jn+aESlp+kj886w710E2YcrOkLNd8nU5ixN85BwudJubZQytgV7KvODSNX5V5hJ789en BZWQ== X-Gm-Message-State: AOJu0YwGM7uVCmJqmTjkvfz2ZaUHTGsyLPOez4MuWgE6yJRIy1uG5KQa v8SRdSfTXpBG+nLYxqbBIAV2gkureu4yR4TzRzAlgBYV4A3E7vbkXon0rw== X-Google-Smtp-Source: AGHT+IHe5ZEvdZCs/MHd7yonW58DwHbP9LMwo8NG/VlmNDiEc6oKaZPqcZrNFwWSiR+JwKhk+hOgvQ== X-Received: by 2002:a05:6830:3c8f:b0:703:6a50:9097 with SMTP id 46e09a7af769-7154e837169mr15591194a34.8.1728402011508; Tue, 08 Oct 2024 08:40:11 -0700 (PDT) Received: from lvondent-mobl5.. (syn-107-146-107-067.res.spectrum.com. [107.146.107.67]) by smtp.gmail.com with ESMTPSA id a1e0cc1a2514c-84f95e3f19asm374840241.8.2024.10.08.08.40.08 for (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 08 Oct 2024 08:40:09 -0700 (PDT) From: Luiz Augusto von Dentz To: linux-bluetooth@vger.kernel.org Subject: [PATCH v1 2/2] Bluetooth: hci_core: Fix not checking skb length on hci_scodata_packet Date: Tue, 8 Oct 2024 11:40:05 -0400 Message-ID: <20241008154005.595169-2-luiz.dentz@gmail.com> X-Mailer: git-send-email 2.46.1 In-Reply-To: <20241008154005.595169-1-luiz.dentz@gmail.com> References: <20241008154005.595169-1-luiz.dentz@gmail.com> Precedence: bulk X-Mailing-List: linux-bluetooth@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 From: Luiz Augusto von Dentz This fixes not checking if skb really contains an SCO header otherwise the code may attempt to access some uninitilized/invalid memory past the valid skb->data. Signed-off-by: Luiz Augusto von Dentz --- net/bluetooth/hci_core.c | 13 +++++++++---- 1 file changed, 9 insertions(+), 4 deletions(-) diff --git a/net/bluetooth/hci_core.c b/net/bluetooth/hci_core.c index d5f917076e0e..462522098129 100644 --- a/net/bluetooth/hci_core.c +++ b/net/bluetooth/hci_core.c @@ -3808,18 +3808,22 @@ static void hci_acldata_packet(struct hci_dev *hdev, struct sk_buff *skb) /* SCO data packet */ static void hci_scodata_packet(struct hci_dev *hdev, struct sk_buff *skb) { - struct hci_sco_hdr *hdr = (void *) skb->data; + struct hci_sco_hdr *hdr; struct hci_conn *conn; __u16 handle, flags; - skb_pull(skb, HCI_SCO_HDR_SIZE); + hdr = skb_pull_data(skb, sizeof(*hdr)); + if (!hdr) { + bt_dev_err(hdev, "SCO packet too small"); + goto drop; + } handle = __le16_to_cpu(hdr->handle); flags = hci_flags(handle); handle = hci_handle(handle); - BT_DBG("%s len %d handle 0x%4.4x flags 0x%4.4x", hdev->name, skb->len, - handle, flags); + bt_dev_dbg(hdev, "%s len %d handle 0x%4.4x flags 0x%4.4x", skb->len, + handle, flags); hdev->stat.sco_rx++; @@ -3837,6 +3841,7 @@ static void hci_scodata_packet(struct hci_dev *hdev, struct sk_buff *skb) handle); } +drop: kfree_skb(skb); }