h4_recv_buf() callers store the return value to socket buffer and
recursively pass the buffer to h4_recv_buf() without protection. So,
ERR_PTR returned from h4_recv_buf() can be dereferenced, if called again
before setting the socket buffer to NULL from previous error. Check if
skb is ERR_PTR in h4_recv_buf().
Reported-by: syzbot+017a32f149406df32703@xxxxxxxxxxxxxxxxxxxxxxxxx
Signed-off-by: Myungho Jung <mhjungk@xxxxxxxxx>
---
drivers/bluetooth/h4_recv.h | 4 ++++
drivers/bluetooth/hci_h4.c | 4 ++++
2 files changed, 8 insertions(+)
diff --git a/drivers/bluetooth/h4_recv.h b/drivers/bluetooth/h4_recv.h
index b432651f8236..285cf72190b7 100644
--- a/drivers/bluetooth/h4_recv.h
+++ b/drivers/bluetooth/h4_recv.h
@@ -60,6 +60,10 @@ static inline struct sk_buff *h4_recv_buf(struct hci_dev *hdev,
const struct h4_recv_pkt *pkts,
int pkts_count)
{
+ /* Check if socket buffer is not reset yet from previous error */
+ if (IS_ERR(skb))
+ skb = NULL;
+
while (count) {
int i, len;
diff --git a/drivers/bluetooth/hci_h4.c b/drivers/bluetooth/hci_h4.c
index fb97a3bf069b..dea48090d2dc 100644
--- a/drivers/bluetooth/hci_h4.c
+++ b/drivers/bluetooth/hci_h4.c
@@ -174,6 +174,10 @@ struct sk_buff *h4_recv_buf(struct hci_dev *hdev, struct sk_buff *skb,
struct hci_uart *hu = hci_get_drvdata(hdev);
u8 alignment = hu->alignment ? hu->alignment : 1;
+ /* Check if socket buffer is not reset yet from previous error */
+ if (IS_ERR(skb))
+ skb = NULL;
+
while (count) {
int i, len;
--
2.17.1
