DivestOS/Patches/LineageOS-14.1/android_system_bt/338000.patch

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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Venkata Jagadeesh Garaga <quic_vgaraga@quicinc.com>
Date: Tue, 22 Mar 2022 13:35:43 +0530
Subject: [PATCH] Fix OOB in reassemble_and_dispatch
Fix OOB while reading L2cap length in HCI pkt
Change-Id: I7f32b171e8c68b9724f95fcf2327959539e2d0d5
CRs-Fixed: 3155132
---
hci/src/packet_fragmenter.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/hci/src/packet_fragmenter.c b/hci/src/packet_fragmenter.c
index f1d302238..b2ebefe0e 100644
--- a/hci/src/packet_fragmenter.c
+++ b/hci/src/packet_fragmenter.c
@@ -130,12 +130,10 @@ static void reassemble_and_dispatch(UNUSED_ATTR BT_HDR *packet) {
if ((packet->event & MSG_EVT_MASK) == MSG_HC_TO_STACK_HCI_ACL) {
uint8_t *stream = packet->data;
uint16_t handle;
- uint16_t l2cap_length;
uint16_t acl_length;
STREAM_TO_UINT16(handle, stream);
STREAM_TO_UINT16(acl_length, stream);
- STREAM_TO_UINT16(l2cap_length, stream);
assert(acl_length == packet->len - HCI_ACL_PREAMBLE_SIZE);
@@ -166,6 +164,9 @@ static void reassemble_and_dispatch(UNUSED_ATTR BT_HDR *packet) {
return;
}
+ uint16_t l2cap_length;
+ STREAM_TO_UINT16(l2cap_length, stream);
+
uint16_t full_length = l2cap_length + L2CAP_HEADER_SIZE + HCI_ACL_PREAMBLE_SIZE;
// Check for buffer overflow and that the full packet size + BT_HDR size is less than