[PATCH v2 net] nfc: close a race condition in llcp_sock_getname()

llcp_sock_getname() checks llcp_sock->dev to make sure
llcp_sock is already connected or bound, however, we could
be in the middle of llcp_sock_bind() where llcp_sock->dev
is bound and llcp_sock->service_name_len is set,
but llcp_sock->service_name is not, in this case we would
lead to copy some bytes from a NULL pointer.

Just lock the sock since this is not a hot path anyway.

Reported-by: Dmitry Vyukov <redacted>
Cc: Lauro Ramos Venancio <redacted>
Cc: Aloisio Almeida Jr <redacted>
Cc: Samuel Ortiz <sameo-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
Signed-off-by: Cong Wang <redacted>
---
 net/nfc/llcp_sock.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/net/nfc/llcp_sock.c b/net/nfc/llcp_sock.c
index ecf0a01..b9edf5f 100644
--- a/net/nfc/llcp_sock.c
+++ b/net/nfc/llcp_sock.c

@@ -509,6 +509,11 @@ static int llcp_sock_getname(struct socket *sock, struct sockaddr *uaddr,
 	memset(llcp_addr, 0, sizeof(*llcp_addr));
 	*len = sizeof(struct sockaddr_nfc_llcp);
 
+	lock_sock(sk);
+	if (!llcp_sock->dev) {
+		release_sock(sk);
+		return -EBADFD;
+	}
 	llcp_addr->sa_family = AF_NFC;
 	llcp_addr->dev_idx = llcp_sock->dev->idx;
 	llcp_addr->target_idx = llcp_sock->target_idx;

@@ -518,6 +523,7 @@ static int llcp_sock_getname(struct socket *sock, struct sockaddr *uaddr,
 	llcp_addr->service_name_len = llcp_sock->service_name_len;
 	memcpy(llcp_addr->service_name, llcp_sock->service_name,
 	       llcp_addr->service_name_len);
+	release_sock(sk);
 
 	return 0;
 }

-- 
1.8.3.1

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On Fri, Jan 29, 2016 at 11:37 AM, Cong Wang [off-list ref] wrote:

llcp_sock_getname() checks llcp_sock->dev to make sure
llcp_sock is already connected or bound, however, we could
be in the middle of llcp_sock_bind() where llcp_sock->dev
is bound and llcp_sock->service_name_len is set,
but llcp_sock->service_name is not, in this case we would
lead to copy some bytes from a NULL pointer.

Just lock the sock since this is not a hot path anyway.

Reported-by: Dmitry Vyukov <dvyukov@google.com>
Cc: Lauro Ramos Venancio <redacted>
Cc: Aloisio Almeida Jr <redacted>
Cc: Samuel Ortiz <redacted>
Signed-off-by: Cong Wang <redacted>

Samuel, please take a look at this one too.

Hi Cong,

On Fri, Jan 29, 2016 at 11:37:40AM -0800, Cong Wang wrote:

llcp_sock_getname() checks llcp_sock->dev to make sure
llcp_sock is already connected or bound, however, we could
be in the middle of llcp_sock_bind() where llcp_sock->dev
is bound and llcp_sock->service_name_len is set,
but llcp_sock->service_name is not, in this case we would
lead to copy some bytes from a NULL pointer.

Just lock the sock since this is not a hot path anyway.

Reported-by: Dmitry Vyukov <dvyukov@google.com>
Cc: Lauro Ramos Venancio <redacted>
Cc: Aloisio Almeida Jr <redacted>
Cc: Samuel Ortiz <redacted>
Signed-off-by: Cong Wang <redacted>
---
 net/nfc/llcp_sock.c | 6 ++++++
 1 file changed, 6 insertions(+)

Applied as well, thanks.

Cheers,
Samuel.