From: Tomas Bortoli <tomasbortoli@gmail.com>
To: marcel@holtmann.org, johan.hedberg@gmail.com
Cc: davem@davemloft.net, linux-bluetooth@vger.kernel.org,
netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
syzkaller@googlegroups.com,
Tomas Bortoli <tomasbortoli@gmail.com>
Subject: [PATCH] net/bluetooth: Fix bound check in event handling
Date: Thu, 28 Feb 2019 20:59:39 +0100 [thread overview]
Message-ID: <20190228195939.30685-1-tomasbortoli@gmail.com> (raw)
hci_inquiry_result_with_rssi_evt() can perform out of bound reads
on skb->data as a bound check is missing.
Signed-off-by: Tomas Bortoli <tomasbortoli@gmail.com>
Reported-by: syzbot+cec7a50c412a2c03f8f5@syzkaller.appspotmail.com
Reported-by: syzbot+660883c56e2fa65d4497@syzkaller.appspotmail.com
---
Syzkaler reports:
https://syzkaller.appspot.com/bug?id=d708485af9edc3af35f3b4d554e827c6c8bf6b0f
https://syzkaller.appspot.com/bug?id=3acd1155d48a5acc5d76711568b04926945a6885
net/bluetooth/hci_event.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/net/bluetooth/hci_event.c b/net/bluetooth/hci_event.c
index ac2826ce162b..aa953d23bb72 100644
--- a/net/bluetooth/hci_event.c
+++ b/net/bluetooth/hci_event.c
@@ -3983,6 +3983,10 @@ static void hci_inquiry_result_with_rssi_evt(struct hci_dev *hdev,
for (; num_rsp; num_rsp--, info++) {
u32 flags;
+ if ((void *)(info + sizeof(info)) >
+ (void *)(skb->data + skb->len))
+ break;
+
bacpy(&data.bdaddr, &info->bdaddr);
data.pscan_rep_mode = info->pscan_rep_mode;
data.pscan_period_mode = info->pscan_period_mode;
--
2.11.0
next reply other threads:[~2019-02-28 20:00 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-02-28 19:59 Tomas Bortoli [this message]
2019-03-02 16:46 ` [PATCH] net/bluetooth: Fix bound check in event handling Marcel Holtmann
2019-03-02 23:17 ` Tomas Bortoli
2019-03-04 15:04 ` Dan Carpenter
2019-03-04 19:58 ` Tomas Bortoli
2019-03-04 20:20 ` Tomas Bortoli
2019-03-30 7:17 ` Dan Carpenter
2019-03-30 8:23 ` [kbuild] " Dan Carpenter
2019-03-30 22:37 ` Tomas Bortoli
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