[PATCH] nfc: st-nci: Fix potential memory leak llt_ndlc_send_queue()

[Abdun Nihaal]

The skb dequeued from the ndlc->send_q is dropped without freeing or
queueing it back to the send_q. The two function targets of
ndlc->ops->write : st_nci_i2c_write() and st_nci_spi_write() don't alter
or free the skb on error. Fix this by queueing back the skb into the
head of send_q to be processed again later.

Fixes: 35630df68d60 ("NFC: st21nfcb: Add driver for STMicroelectronics ST21NFCB NFC chip")
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Abdun Nihaal <nihaal@xxxxxxxxxxxxxx>
---
Compile tested only. Issue found using static analysis.

 drivers/nfc/st-nci/ndlc.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/nfc/st-nci/ndlc.c b/drivers/nfc/st-nci/ndlc.c
index be4808859cfa..480a30acd996 100644
--- a/drivers/nfc/st-nci/ndlc.c
+++ b/drivers/nfc/st-nci/ndlc.c
@@ -101,6 +101,7 @@ static void llt_ndlc_send_queue(struct llt_ndlc *ndlc)
 		r = ndlc->ops->write(ndlc->phy_id, skb);
 		if (r < 0) {
 			ndlc->hard_fault = r;
+			skb_queue_head(&ndlc->send_q, skb);
 			break;
 		}
 		time_sent = jiffies;
-- 
2.43.0