From: Lv Yunlong lyl2019@mail.ustc.edu.cn
[ Upstream commit 75258586793efc521e5dd52a5bf6c7a4cf7002be ]
In digital_tg_recv_dep_req, it calls nfc_tm_data_received(..,resp). If nfc_tm_data_received() failed, the callee will free the resp via kfree_skb() and return error. But in the exit branch, the resp will be freed again.
My patch sets resp to NULL if nfc_tm_data_received() failed, to avoid the double free.
Fixes: 1c7a4c24fbfd9 ("NFC Digital: Add target NFC-DEP support") Signed-off-by: Lv Yunlong lyl2019@mail.ustc.edu.cn Signed-off-by: David S. Miller davem@davemloft.net Signed-off-by: Sasha Levin sashal@kernel.org --- net/nfc/digital_dep.c | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/net/nfc/digital_dep.c b/net/nfc/digital_dep.c index 65aaa9d7c813..bcd4d74e8a82 100644 --- a/net/nfc/digital_dep.c +++ b/net/nfc/digital_dep.c @@ -1276,6 +1276,8 @@ static void digital_tg_recv_dep_req(struct nfc_digital_dev *ddev, void *arg, }
rc = nfc_tm_data_received(ddev->nfc_dev, resp); + if (rc) + resp = NULL;
exit: kfree_skb(ddev->chaining_skb);