[PATCH 5.1 204/371] Bluetooth: hci_bcsp: Fix memory leak in rx_skb

[Greg Kroah-Hartman]

[ Upstream commit 4ce9146e0370fcd573f0372d9b4e5a211112567c ]

Syzkaller found that it is possible to provoke a memory leak by
never freeing rx_skb in struct bcsp_struct.

Fix by freeing in bcsp_close()

Signed-off-by: Tomas Bortoli <tomasbort...@gmail.com>
Reported-by: syzbot+98162c885993b72f1...@syzkaller.appspotmail.com
Signed-off-by: Marcel Holtmann <mar...@holtmann.org>
Signed-off-by: Sasha Levin <sas...@kernel.org>
---
 drivers/bluetooth/hci_bcsp.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/bluetooth/hci_bcsp.c b/drivers/bluetooth/hci_bcsp.c
index 1a7f0c82fb36..66fe1e6dc631 100644
--- a/drivers/bluetooth/hci_bcsp.c
+++ b/drivers/bluetooth/hci_bcsp.c
@@ -759,6 +759,11 @@ static int bcsp_close(struct hci_uart *hu)
        skb_queue_purge(&bcsp->rel);
        skb_queue_purge(&bcsp->unrel);
 
+       if (bcsp->rx_skb) {
+               kfree_skb(bcsp->rx_skb);
+               bcsp->rx_skb = NULL;
+       }
+
        kfree(bcsp);
        return 0;
 }
-- 
2.20.1