[PATCH] nfc: st21nfca: fix possible double free in st21nfca_im_recv_dep_res_cb()
From: Hangyu Hua
Date: Wed Jun 22 2022 - 02:51:37 EST
nfc_tm_data_received will free skb internally when it fails. There is no
need to free skb in st21nfca_im_recv_dep_res_cb again.
Fix this by setting skb to NULL when nfc_tm_data_received fails.
Fixes: 1892bf844ea0 ("NFC: st21nfca: Adding P2P support to st21nfca in Initiator & Target mode")
Signed-off-by: Hangyu Hua <hbh25y@xxxxxxxxx>
---
drivers/nfc/st21nfca/dep.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/nfc/st21nfca/dep.c b/drivers/nfc/st21nfca/dep.c
index 1ec651e31064..07ac5688011c 100644
--- a/drivers/nfc/st21nfca/dep.c
+++ b/drivers/nfc/st21nfca/dep.c
@@ -594,7 +594,8 @@ static void st21nfca_im_recv_dep_res_cb(void *context, struct sk_buff *skb,
ST21NFCA_NFC_DEP_PFB_PNI(dep_res->pfb + 1);
size++;
skb_pull(skb, size);
- nfc_tm_data_received(info->hdev->ndev, skb);
+ if (nfc_tm_data_received(info->hdev->ndev, skb))
+ skb = NULL;
break;
case ST21NFCA_NFC_DEP_PFB_SUPERVISOR_PDU:
pr_err("Received a SUPERVISOR PDU\n");
--
2.25.1