add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/net/batman-adv/fragmentation.c
..
..
@@ -1,19 +1,7 @@
1
1
 // SPDX-License-Identifier: GPL-2.0
2
-/* Copyright (C) 2013-2018  B.A.T.M.A.N. contributors:
2
+/* Copyright (C) 2013-2020  B.A.T.M.A.N. contributors:
3
3
  *
4
4
  * Martin Hundebøll <martin@hundeboll.net>
5
- *
6
- * This program is free software; you can redistribute it and/or
7
- * modify it under the terms of version 2 of the GNU General Public
8
- * License as published by the Free Software Foundation.
9
- *
10
- * This program is distributed in the hope that it will be useful, but
11
- * WITHOUT ANY WARRANTY; without even the implied warranty of
12
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13
- * General Public License for more details.
14
- *
15
- * You should have received a copy of the GNU General Public License
16
- * along with this program; if not, see <http://www.gnu.org/licenses/>.
17
5
  */
18
6
 
19
7
 #include "fragmentation.h"
..
..
@@ -114,8 +102,8 @@
114
102
  *
115
103
  * Caller must hold chain->lock.
116
104
  *
117
- * Return: true if chain is empty and caller can just insert the new fragment
118
- * without searching for the right position.
105
+ * Return: true if chain is empty and the caller can just insert the new
106
+ * fragment without searching for the right position.
119
107
  */
120
108
 static bool batadv_frag_init_chain(struct batadv_frag_table_entry *chain,
121
109
 				   u16 seqno)
..
..
@@ -318,7 +306,7 @@
318
306
  * set *skb to merged packet; 2) Packet is buffered: Return true and set *skb
319
307
  * to NULL; 3) Error: Return false and free skb.
320
308
  *
321
- * Return: true when packet is merged or buffered, false when skb is not not
309
+ * Return: true when the packet is merged or buffered, false when skb is not
322
310
  * used.
323
311
  */
324
312
 bool batadv_frag_skb_buffer(struct sk_buff **skb,
..
..
@@ -490,6 +478,17 @@
490
478
 		goto free_skb;
491
479
 	}
492
480
 
481
+	/* GRO might have added fragments to the fragment list instead of
482
+	 * frags[]. But this is not handled by skb_split and must be
483
+	 * linearized to avoid incorrect length information after all
484
+	 * batman-adv fragments were created and submitted to the
485
+	 * hard-interface
486
+	 */
487
+	if (skb_has_frag_list(skb) && __skb_linearize(skb)) {
488
+		ret = -ENOMEM;
489
+		goto free_skb;
490
+	}
491
+
493
492
 	/* Create one header to be copied to all fragments */
494
493
 	frag_header.packet_type = BATADV_UNICAST_FRAG;
495
494
 	frag_header.version = BATADV_COMPAT_VERSION;