The functions nfc_genl_llc_set_params and nfc_genl_llc_sdreq drops the reference to dev via nfc_put_device on the error branch that no local device is found. However, the error handling block reads dev's field and then put dev again. This may result in use-after-free bugs. The patch removes the unexpected call to nfc_put_device. Signed-off-by: Pan Bian <bianpan2016@xxxxxxx> --- net/nfc/netlink.c | 2 -- 1 file changed, 2 deletions(-) diff --git a/net/nfc/netlink.c b/net/nfc/netlink.c index 376181c..e1f2057 100644 --- a/net/nfc/netlink.c +++ b/net/nfc/netlink.c @@ -1107,7 +1107,6 @@ static int nfc_genl_llc_set_params(struct sk_buff *skb, struct genl_info *info) local = nfc_llcp_find_local(dev); if (!local) { - nfc_put_device(dev); rc = -ENODEV; goto exit; } @@ -1167,7 +1166,6 @@ static int nfc_genl_llc_sdreq(struct sk_buff *skb, struct genl_info *info) local = nfc_llcp_find_local(dev); if (!local) { - nfc_put_device(dev); rc = -ENODEV; goto exit; } -- 2.7.4