[PATCH 7.2 40/82] nfc: pn533: purge fragmented skbs during cleanup

7.2-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Xu Rao <[email protected]>

commit 5718fc62198c38c2de5316020a90506f9e75e0bb upstream.

pn53x_common_clean() purges resp_q before freeing the common PN533 state,
but it leaves fragment_skb untouched.  The fragmentation helpers queue
transmit fragments there while sending large initiator or target-mode
frames, and those skbs remain owned by the driver until they are sent or
discarded.

If the device is removed while fragments are still queued, the common
cleanup path frees the PN533 state without releasing the queued fragment
skbs, leaking them.

Purge fragment_skb during cleanup alongside resp_q.

Fixes: 963a82e07d4e ("NFC: pn533: Split large Tx frames in chunks")
Cc: [email protected]
Signed-off-by: Xu Rao <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: David Heidelberg <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
 drivers/nfc/pn533/pn533.c |    1 +
 1 file changed, 1 insertion(+)

--- a/drivers/nfc/pn533/pn533.c
+++ b/drivers/nfc/pn533/pn533.c
@@ -2799,6 +2799,7 @@ void pn53x_common_clean(struct pn533 *pr
 	destroy_workqueue(priv->wq);
 
 	skb_queue_purge(&priv->resp_q);
+	skb_queue_purge(&priv->fragment_skb);
 
 	list_for_each_entry_safe(cmd, n, &priv->cmd_queue, queue) {
 		list_del(&cmd->queue);