# \[PATCH\] NFC: Fix possible NULL ptr deref when getting the name of a socket

- From: Sasha Levin \<hidden\>
- Date: 2012-06-06 21:01:55 
- List: netdev
- Page: https://ratatoskr.run/netdev/2012/06/3875406
- Thread: https://ratatoskr.run/linux-wireless/2012/06/3875406/t.md

```text
llcp_sock_getname() might get called before the LLCP socket was created.
This condition isn't checked, and llcp_sock_getname will simply deref a
NULL ptr in that case.

This exists starting with d646960 ("NFC: Initial LLCP support").

Signed-off-by: Sasha Levin <redacted>
---
 net/nfc/llcp/sock.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/net/nfc/llcp/sock.c b/net/nfc/llcp/sock.c
index 3f339b1..17a707d 100644
--- a/net/nfc/llcp/sock.c
+++ b/net/nfc/llcp/sock.c
@@ -292,6 +292,9 @@ static int llcp_sock_getname(struct socket *sock, struct sockaddr *addr,
 
 	pr_debug("%p\n", sk);
 
+	if (llcp_sock == NULL)
+		return -EBADFD;
+
 	addr->sa_family = AF_NFC;
 	*len = sizeof(struct sockaddr_nfc_llcp);
 
-- 
1.7.8.6
```