修改4g拨号为QMI,需要在系统里后台执行quectel-CM

hc

2024-10-22 8ac6c7a54ed1b98d142dce24b11c6de6a1e239a5

 kernel/net/dccp/proto.c
..
..
@@ -171,12 +171,18 @@
171
171
 
172
172
 EXPORT_SYMBOL_GPL(dccp_packet_name);
173
173
 
174
-static void dccp_sk_destruct(struct sock *sk)
174
+void dccp_destruct_common(struct sock *sk)
175
175
 {
176
176
 	struct dccp_sock *dp = dccp_sk(sk);
177
177
 
178
178
 	ccid_hc_tx_delete(dp->dccps_hc_tx_ccid, sk);
179
179
 	dp->dccps_hc_tx_ccid = NULL;
180
+}
181
+EXPORT_SYMBOL_GPL(dccp_destruct_common);
182
+
183
+static void dccp_sk_destruct(struct sock *sk)
184
+{
185
+	dccp_destruct_common(sk);
180
186
 	inet_sock_destruct(sk);
181
187
 }
182
188
 
..
..
@@ -318,11 +324,15 @@
318
324
 __poll_t dccp_poll(struct file *file, struct socket *sock,
319
325
 		       poll_table *wait)
320
326
 {
321
-	__poll_t mask;
322
327
 	struct sock *sk = sock->sk;
328
+	__poll_t mask;
329
+	u8 shutdown;
330
+	int state;
323
331
 
324
332
 	sock_poll_wait(file, sock, wait);
325
-	if (sk->sk_state == DCCP_LISTEN)
333
+
334
+	state = inet_sk_state_load(sk);
335
+	if (state == DCCP_LISTEN)
326
336
 		return inet_csk_listen_poll(sk);
327
337
 
328
338
 	/* Socket is not locked. We are protected from async events
..
..
@@ -331,20 +341,21 @@
331
341
 	 */
332
342
 
333
343
 	mask = 0;
334
-	if (sk->sk_err)
344
+	if (READ_ONCE(sk->sk_err))
335
345
 		mask = EPOLLERR;
346
+	shutdown = READ_ONCE(sk->sk_shutdown);
336
347
 
337
-	if (sk->sk_shutdown == SHUTDOWN_MASK || sk->sk_state == DCCP_CLOSED)
348
+	if (shutdown == SHUTDOWN_MASK || state == DCCP_CLOSED)
338
349
 		mask |= EPOLLHUP;
339
-	if (sk->sk_shutdown & RCV_SHUTDOWN)
350
+	if (shutdown & RCV_SHUTDOWN)
340
351
 		mask |= EPOLLIN | EPOLLRDNORM | EPOLLRDHUP;
341
352
 
342
353
 	/* Connected? */
343
-	if ((1 << sk->sk_state) & ~(DCCPF_REQUESTING | DCCPF_RESPOND)) {
354
+	if ((1 << state) & ~(DCCPF_REQUESTING | DCCPF_RESPOND)) {
344
355
 		if (atomic_read(&sk->sk_rmem_alloc) > 0)
345
356
 			mask |= EPOLLIN | EPOLLRDNORM;
346
357
 
347
-		if (!(sk->sk_shutdown & SEND_SHUTDOWN)) {
358
+		if (!(shutdown & SEND_SHUTDOWN)) {
348
359
 			if (sk_stream_is_writeable(sk)) {
349
360
 				mask |= EPOLLOUT | EPOLLWRNORM;
350
361
 			} else {  /* send SIGIO later */
..
..
@@ -362,7 +373,6 @@
362
373
 	}
363
374
 	return mask;
364
375
 }
365
-
366
376
 EXPORT_SYMBOL_GPL(dccp_poll);
367
377
 
368
378
 int dccp_ioctl(struct sock *sk, int cmd, unsigned long arg)
..
..
@@ -633,7 +643,7 @@
633
643
 		return dccp_getsockopt_service(sk, len,
634
644
 					       (__be32 __user *)optval, optlen);
635
645
 	case DCCP_SOCKOPT_GET_CUR_MPS:
636
-		val = dp->dccps_mss_cache;
646
+		val = READ_ONCE(dp->dccps_mss_cache);
637
647
 		break;
638
648
 	case DCCP_SOCKOPT_AVAILABLE_CCIDS:
639
649
 		return ccid_getsockopt_builtin_ccids(sk, len, optval, optlen);
..
..
@@ -742,7 +752,7 @@
742
752
 
743
753
 	trace_dccp_probe(sk, len);
744
754
 
745
-	if (len > dp->dccps_mss_cache)
755
+	if (len > READ_ONCE(dp->dccps_mss_cache))
746
756
 		return -EMSGSIZE;
747
757
 
748
758
 	lock_sock(sk);
..
..
@@ -775,6 +785,12 @@
775
785
 		goto out_discard;
776
786
 	}
777
787
 
788
+	/* We need to check dccps_mss_cache after socket is locked. */
789
+	if (len > dp->dccps_mss_cache) {
790
+		rc = -EMSGSIZE;
791
+		goto out_discard;
792
+	}
793
+
778
794
 	skb_reserve(skb, sk->sk_prot->max_header);
779
795
 	rc = memcpy_from_msg(skb_put(skb, len), msg, len);
780
796
 	if (rc != 0)