From: Luiz Augusto von Dentz luiz.von.dentz@intel.com
[ Upstream commit 3fe288a8214e7dd784d1f9b7c9e448244d316b47 ]
This fixes not checking if skb really contains an ACL header otherwise the code may attempt to access some uninitilized/invalid memory past the valid skb->data.
Reported-by: syzbot+6ea290ba76d8c1eb1ac2@syzkaller.appspotmail.com Tested-by: syzbot+6ea290ba76d8c1eb1ac2@syzkaller.appspotmail.com Closes: https://syzkaller.appspot.com/bug?extid=6ea290ba76d8c1eb1ac2 Signed-off-by: Luiz Augusto von Dentz luiz.von.dentz@intel.com Signed-off-by: Sasha Levin sashal@kernel.org --- 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 789f7f4a09089..3cd7c212375fc 100644 --- a/net/bluetooth/hci_core.c +++ b/net/bluetooth/hci_core.c @@ -3829,18 +3829,22 @@ static void hci_tx_work(struct work_struct *work) /* ACL data packet */ static void hci_acldata_packet(struct hci_dev *hdev, struct sk_buff *skb) { - struct hci_acl_hdr *hdr = (void *) skb->data; + struct hci_acl_hdr *hdr; struct hci_conn *conn; __u16 handle, flags;
- skb_pull(skb, HCI_ACL_HDR_SIZE); + hdr = skb_pull_data(skb, sizeof(*hdr)); + if (!hdr) { + bt_dev_err(hdev, "ACL 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, "len %d handle 0x%4.4x flags 0x%4.4x", skb->len, + handle, flags);
hdev->stat.acl_rx++;
@@ -3859,6 +3863,7 @@ static void hci_acldata_packet(struct hci_dev *hdev, struct sk_buff *skb) handle); }
+drop: kfree_skb(skb); }