* [PATCH] NFC: netlink: remove unexpected nfc_put_device
@ 2018-11-27 7:54 Pan Bian
0 siblings, 0 replies; only message in thread
From: Pan Bian @ 2018-11-27 7:54 UTC (permalink / raw)
To: Samuel Ortiz, David S. Miller
Cc: linux-wireless, netdev, linux-kernel, Pan Bian
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@163.com>
---
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
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2018-11-27 7:54 [PATCH] NFC: netlink: remove unexpected nfc_put_device Pan Bian
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