Sven Eckelmann d7d8bbb40a batman-adv: Expand merged fragment buffer for full packet ... The complete size ("total_size") of the fragmented packet is stored in the fragment header and in the size of the fragment chain. When the fragments are ready for merge, the skbuff's tail of the first fragment is expanded to have enough room after the data pointer for at least total_size. This means that it gets expanded by total_size - first_skb->len. But this is ignoring the fact that after expanding the buffer, the fragment header is pulled by from this buffer. Assuming that the tailroom of the buffer was already 0, the buffer after the data pointer of the skbuff is now only total_size - len(fragment_header) large. When the merge function is then processing the remaining fragments, the code to copy the data over to the merged skbuff will cause an skb_over_panic when it tries to actually put enough data to fill the total_size bytes of the packet. The size of the skb_pull must therefore also be taken into account when the buffer's tailroom is expanded. Fixes: 610bfc6bc9 ("batman-adv: Receive fragmented packets and merge") Reported-by: Martin Weinelt <martin@darmstadt.freifunk.net> Co-authored-by: Linus Lüssing <linus.luessing@c0d3.blue> Signed-off-by: Sven Eckelmann <sven@narfation.org> Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>		2018-11-12 10:41:29 +01:00
..
Kconfig	batman-adv: Provide debug messages as trace events	2018-09-15 09:51:08 +02:00
Makefile	batman-adv: Provide debug messages as trace events	2018-09-15 09:51:08 +02:00
bat_algo.c	batman-adv: Update copyright years for 2018	2018-02-26 17:57:39 +01:00
bat_algo.h	batman-adv: Update copyright years for 2018	2018-02-26 17:57:39 +01:00
bat_iv_ogm.c	batman-adv: Move OGM rebroadcast stats to orig_ifinfo	2018-09-15 09:51:10 +02:00
bat_iv_ogm.h	batman-adv: Unify include guards style	2018-07-07 22:02:17 +02:00
bat_v.c	batman-adv: Fix bat_v best gw refcnt after netlink dump	2018-06-23 10:29:33 +02:00
bat_v.h	batman-adv: Update copyright years for 2018	2018-02-26 17:57:39 +01:00
bat_v_elp.c	batman-adv: Use explicit tvlv padding for ELP packets	2018-11-12 10:41:29 +01:00
bat_v_elp.h	batman-adv: Update copyright years for 2018	2018-02-26 17:57:39 +01:00
bat_v_ogm.c	batman-adv: Update copyright years for 2018	2018-02-26 17:57:39 +01:00
bat_v_ogm.h	batman-adv: Unify include guards style	2018-07-07 22:02:17 +02:00
bitarray.c	batman-adv: Update copyright years for 2018	2018-02-26 17:57:39 +01:00
bitarray.h	batman-adv: Update copyright years for 2018	2018-02-26 17:57:39 +01:00
bridge_loop_avoidance.c	batman-adv: fix backbone_gw refcount on queue_work() failure	2018-09-07 08:14:26 +02:00
bridge_loop_avoidance.h	batman-adv: Update copyright years for 2018	2018-02-26 17:57:39 +01:00
debugfs.c	batman-adv: Mark debugfs functionality as deprecated	2018-09-14 10:50:26 +02:00
debugfs.h	batman-adv: Mark debugfs functionality as deprecated	2018-09-14 10:50:26 +02:00
distributed-arp-table.c	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net	2018-03-23 11:31:58 -04:00
distributed-arp-table.h	batman-adv: add DAT cache netlink support	2018-03-14 10:15:08 +01:00
fragmentation.c	batman-adv: Expand merged fragment buffer for full packet	2018-11-12 10:41:29 +01:00
fragmentation.h	batman-adv: Update copyright years for 2018	2018-02-26 17:57:39 +01:00
gateway_client.c	batman-adv: Prevent duplicated gateway_node entry	2018-09-06 13:55:20 +02:00
gateway_client.h	batman-adv: Update copyright years for 2018	2018-02-26 17:57:39 +01:00
gateway_common.c	batman-adv: Update copyright years for 2018	2018-02-26 17:57:39 +01:00
gateway_common.h	batman-adv: Update copyright years for 2018	2018-02-26 17:57:39 +01:00
hard-interface.c	batman-adv: Move OGM rebroadcast stats to orig_ifinfo	2018-09-15 09:51:10 +02:00
hard-interface.h	batman-adv: Update copyright years for 2018	2018-02-26 17:57:39 +01:00
hash.c	batman-adv: Update copyright years for 2018	2018-02-26 17:57:39 +01:00
hash.h	batman-adv: Update copyright years for 2018	2018-02-26 17:57:39 +01:00
icmp_socket.c	batman-adv: Mark debugfs functionality as deprecated	2018-09-14 10:50:26 +02:00
icmp_socket.h	batman-adv: Update copyright years for 2018	2018-02-26 17:57:39 +01:00
log.c	batman-adv: Provide debug messages as trace events	2018-09-15 09:51:08 +02:00
log.h	batman-adv: Update copyright years for 2018	2018-02-26 17:57:39 +01:00
main.c	batman-adv: Update copyright years for 2018	2018-02-26 17:57:39 +01:00
main.h	batman-adv: Increase version number to 2018.3	2018-09-14 17:59:20 +02:00
multicast.c	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net	2018-05-26 19:46:15 -04:00
multicast.h	batman-adv: add multicast flags netlink support	2018-03-14 10:15:34 +01:00
netlink.c	batman-adv: add multicast flags netlink support	2018-03-14 10:15:34 +01:00
netlink.h	batman-adv: Update copyright years for 2018	2018-02-26 17:57:39 +01:00
network-coding.c	batman-adv: Prevent duplicated nc_node entry	2018-09-06 13:55:58 +02:00
network-coding.h	batman-adv: Update copyright years for 2018	2018-02-26 17:57:39 +01:00
originator.c	batman-adv: Move OGM rebroadcast stats to orig_ifinfo	2018-09-15 09:51:10 +02:00
originator.h	batman-adv: Move OGM rebroadcast stats to orig_ifinfo	2018-09-15 09:51:10 +02:00
routing.c	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net	2018-03-23 11:31:58 -04:00
routing.h	batman-adv: Update copyright years for 2018	2018-02-26 17:57:39 +01:00
send.c	batman-adv: Update copyright years for 2018	2018-02-26 17:57:39 +01:00
send.h	batman-adv: Update copyright years for 2018	2018-02-26 17:57:39 +01:00
soft-interface.c	Merge ra.kernel.org:/pub/scm/linux/kernel/git/davem/net	2018-09-25 10:35:29 -07:00
soft-interface.h	batman-adv: Update copyright years for 2018	2018-02-26 17:57:39 +01:00
sysfs.c	batman-adv: Fix segfault when writing to sysfs elp_interval	2018-09-06 13:54:48 +02:00
sysfs.h	batman-adv: Update copyright years for 2018	2018-02-26 17:57:39 +01:00
tp_meter.c	batman-adv: Update copyright years for 2018	2018-02-26 17:57:39 +01:00
tp_meter.h	batman-adv: Update copyright years for 2018	2018-02-26 17:57:39 +01:00
trace.c	batman-adv: Provide debug messages as trace events	2018-09-15 09:51:08 +02:00
trace.h	batman-adv: Provide debug messages as trace events	2018-09-15 09:51:08 +02:00
translation-table.c	batman-adv: Prevent duplicated global TT entry	2018-09-06 14:37:12 +02:00
translation-table.h	batman-adv: Update copyright years for 2018	2018-02-26 17:57:39 +01:00
tvlv.c	batman-adv: Prevent duplicated tvlv handler	2018-09-06 14:37:13 +02:00
tvlv.h	batman-adv: Update copyright years for 2018	2018-02-26 17:57:39 +01:00
types.h	batman-adv: Move OGM rebroadcast stats to orig_ifinfo	2018-09-15 09:51:10 +02:00