[PATCH 5.10 669/798] nfc: llcp: read llcp_sock->local under the socket lock in getsockopt

5.10-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Breno Leitao <leitao@debian.org>

[ Upstream commit 36812527052c5bfb1ec6c1e292d67a5bf76b750f ]

nfc_llcp_getsockopt() read llcp_sock->local before lock_sock(sk) and
then dereferenced the cached pointer inside the locked region.
llcp_sock_bind() assigns and clears llcp_sock->local under the same
socket lock, dropping the last reference on its error path. A
getsockopt() racing an in-flight bind() can observe the pointer, block
on lock_sock(), and then dereference a freed nfc_llcp_local once bind()
has unwound.

Move the llcp_sock->local read and the NULL check inside the
lock_sock(sk) region so bind() cannot mutate or free the pointer between
the load and the use.

Fixes: 26fd76cab2e6 ("NFC: llcp: Implement socket options")
Signed-off-by: Breno Leitao <leitao@debian.org>
Reviewed-by: Simon Horman <horms@kernel.org>
Link: https://patch.msgid.link/20260521-fix_llc-v2-2-ab44cc09179c@debian.org (local)
Signed-off-by: David Heidelberg <david@ixit.cz>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 net/nfc/llcp_sock.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/net/nfc/llcp_sock.c b/net/nfc/llcp_sock.c
index 0ba5ffe0ce6d1..85767c13543b5 100644
--- a/net/nfc/llcp_sock.c
+++ b/net/nfc/llcp_sock.c

@@ -320,14 +320,16 @@ static int nfc_llcp_getsockopt(struct socket *sock, int level, int optname,
 	if (len < sizeof(u32))
 		return -EINVAL;
 
-	local = llcp_sock->local;
-	if (!local)
-		return -ENODEV;
-
 	len = min_t(u32, len, sizeof(u32));
 
 	lock_sock(sk);
 
+	local = llcp_sock->local;
+	if (!local) {
+		release_sock(sk);
+		return -ENODEV;
+	}
+
 	switch (optname) {
 	case NFC_LLCP_RW:
 		rw = llcp_sock->rw > LLCP_MAX_RW ? local->rw : llcp_sock->rw;

-- 
2.53.0