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SubjectRe: [syzbot] [net?] [nfc?] KASAN: slab-use-after-free Read in nfc_alloc_send_skb
From
#syz test https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master

diff --git a/net/nfc/llcp_sock.c b/net/nfc/llcp_sock.c
index 645677f84dba..ea0e6c85866d 100644
--- a/net/nfc/llcp_sock.c
+++ b/net/nfc/llcp_sock.c
@@ -796,6 +796,11 @@ static int llcp_sock_sendmsg(struct socket *sock, struct msghdr *msg,
}

if (sk->sk_type == SOCK_DGRAM) {
+ if (sk->sk_state != LLCP_BOUND) {
+ release_sock(sk);
+ return -ENOLINK;
+ }
+
DECLARE_SOCKADDR(struct sockaddr_nfc_llcp *, addr,
msg->msg_name);

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