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Eric Dumazet 7162fb242c tcp: do not underestimate skb->truesize in tcp_trim_head() 
Andrey found a way to trigger the WARN_ON_ONCE(delta < len) in
skb_try_coalesce() using syzkaller and a filter attached to a TCP
socket over loopback interface.

I believe one issue with looped skbs is that tcp_trim_head() can end up
producing skb with under estimated truesize.

It hardly matters for normal conditions, since packets sent over
loopback are never truncated.

Bytes trimmed from skb->head should not change skb truesize, since
skb->head is not reallocated.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Reported-by: Andrey Konovalov <andreyknvl@google.com>
Tested-by: Andrey Konovalov <andreyknvl@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
 		2017-04-28 16:05:22 -04:00
..
6lowpan 6lowpan: use rb_entry() 2017-01-22 16:46:13 -05:00
9p Merge branch 'work.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2017-03-03 21:44:35 -08:00
802 Replace <asm/uaccess.h> with <linux/uaccess.h> globally 2016-12-24 11:46:01 -08:00
8021q net: remove ndo_neigh_{construct, destroy} from stacked devices 2017-02-06 11:25:57 -05:00
appletalk lib/vsprintf.c: remove %Z support 2017-02-27 18:43:47 -08:00
atm net: Work around lockdep limitation in sockets that use sockets 2017-03-09 18:23:27 -08:00
ax25 net: Work around lockdep limitation in sockets that use sockets 2017-03-09 18:23:27 -08:00
batman-adv Here are two batman-adv bugfixes: 2017-03-16 12:05:38 -07:00
bluetooth net: Work around lockdep limitation in sockets that use sockets 2017-03-09 18:23:27 -08:00
bridge bridge: move bridge multicast cleanup to ndo_uninit 2017-04-25 14:02:39 -04:00
caif sched/headers: Prepare for new header dependencies before moving code to <linux/sched/signal.h> 2017-03-02 08:42:29 +01:00
can can: bcm: fix hrtimer/tasklet termination in bcm op removal 2017-01-30 11:05:04 +01:00
ceph libceph: force GFP_NOIO for socket allocations 2017-03-23 12:03:36 +01:00
core net: core: Prevent from dereferencing null pointer when releasing SKB 2017-04-26 14:47:14 -04:00
dcb net: dcb: set error code on failures 2016-12-03 23:54:25 -05:00
dccp dccp: fix memory leak during tear-down of unsuccessful connection request 2017-03-13 22:00:42 -07:00
decnet net: Work around lockdep limitation in sockets that use sockets 2017-03-09 18:23:27 -08:00
dns_resolver Merge branch 'WIP.sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2017-03-03 10:16:38 -08:00
dsa Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2017-02-11 02:31:11 -05:00
ethernet Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/klassert/ipsec-next 2017-02-16 21:25:49 -05:00
hsr net/hsr: use eth_hw_addr_random() 2017-02-21 13:25:22 -05:00
ieee802154 lib/vsprintf.c: remove %Z support 2017-02-27 18:43:47 -08:00
ife net: Introduce ife encapsulation module 2017-02-03 15:16:45 -05:00
ipv4 tcp: do not underestimate skb->truesize in tcp_trim_head() 2017-04-28 16:05:22 -04:00
ipv6 ipv6: check raw payload size correctly in ioctl 2017-04-26 14:59:35 -04:00
ipx ktime: Get rid of the union 2016-12-25 17:21:22 +01:00
irda net: Work around lockdep limitation in sockets that use sockets 2017-03-09 18:23:27 -08:00
iucv net: Work around lockdep limitation in sockets that use sockets 2017-03-09 18:23:27 -08:00
kcm kcm: return immediately after copy_from_user() failure 2017-03-24 13:13:53 -07:00
key af_key: Fix sadb_x_ipsecrequest parsing 2017-04-18 08:26:03 +02:00
l2tp l2tp: don't mask errors in pppol2tp_getsockopt() 2017-04-08 08:29:04 -07:00
l3mdev net: ipv6: Remove l3mdev_get_saddr6 2016-09-10 23:12:53 -07:00
lapb Replace <asm/uaccess.h> with <linux/uaccess.h> globally 2016-12-24 11:46:01 -08:00
llc net: Work around lockdep limitation in sockets that use sockets 2017-03-09 18:23:27 -08:00
mac80211 mac80211: reject ToDS broadcast data frames 2017-04-20 15:37:46 -04:00
mac802154 sched/headers: Prepare to use <linux/rcuupdate.h> instead of <linux/rculist.h> in <linux/sched.h> 2017-03-02 08:42:38 +01:00
mpls net: mpls: Fix nexthop alive tracking on down events 2017-03-16 20:22:18 -07:00
ncsi net/ncsi: Improve HNCDSC AEN handler 2016-10-20 11:23:08 -04:00
netfilter netfilter: nft_hash: do not dump the auto generated seed 2017-04-13 23:20:13 +02:00
netlabel netlabel: add CALIPSO to the list of built-in protocols 2017-01-06 22:20:45 -05:00
netlink genetlink: fix counting regression on ctrl_dumpfamily() 2017-03-22 15:38:43 -07:00
netrom net: Work around lockdep limitation in sockets that use sockets 2017-03-09 18:23:27 -08:00
nfc net: Work around lockdep limitation in sockets that use sockets 2017-03-09 18:23:27 -08:00
openvswitch openvswitch: Fix ovs_flow_key_update() 2017-04-01 12:16:46 -07:00
packet net/packet: check length in getsockopt() called with PACKET_HDRLEN 2017-04-25 14:05:52 -04:00
phonet net: Work around lockdep limitation in sockets that use sockets 2017-03-09 18:23:27 -08:00
psample net: Introduce psample, a new genetlink channel for packet sampling 2017-01-24 13:44:28 -05:00
qrtr net: qrtr: potential use after free in qrtr_sendmsg() 2017-04-21 15:19:27 -04:00
rds net: Work around lockdep limitation in sockets that use sockets 2017-03-09 18:23:27 -08:00
rfkill rfkill: remove rfkill-regulator 2017-01-24 11:07:35 +01:00
rose net: Work around lockdep limitation in sockets that use sockets 2017-03-09 18:23:27 -08:00
rxrpc rxrpc: Ignore BUSY packets on old calls 2017-03-16 21:27:57 -07:00
sched net sched actions: allocate act cookie early 2017-04-20 16:32:07 -04:00
sctp sctp: listen on the sock only when it's state is listening or closed 2017-04-06 13:55:51 -07:00
smc net: Work around lockdep limitation in sockets that use sockets 2017-03-09 18:23:27 -08:00
strparser strparser: destroy workqueue on module exit 2017-03-03 20:43:26 -08:00
sunrpc The restriction of NFSv4 to TCP went overboard and also broke the 2017-04-01 10:43:37 -07:00
switchdev Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2016-10-30 12:42:58 -04:00
tipc tipc: close the connection if protocol messages contain errors 2017-04-28 12:20:42 -04:00
unix net: unix: properly re-increment inflight counter of GC discarded candidates 2017-03-21 15:25:10 -07:00
vmw_vsock vsock: cancel packets when failing to connect 2017-03-21 14:41:47 -07:00
wimax genetlink: mark families as __ro_after_init 2016-10-27 16:16:09 -04:00
wireless cfg80211: check rdev resume callback only for registered wiphy 2017-03-29 09:11:29 +02:00
x25 net: Work around lockdep limitation in sockets that use sockets 2017-03-09 18:23:27 -08:00
xfrm xfrm: fix GRO for !CONFIG_NETFILTER 2017-04-27 12:20:19 +02:00
Kconfig bpf: make jited programs visible in traces 2017-02-17 13:40:05 -05:00
Makefile net: Introduce ife encapsulation module 2017-02-03 15:16:45 -05:00
compat.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next 2017-02-22 10:15:09 -08:00
socket.c tcp: mark skbs with SCM_TIMESTAMPING_OPT_STATS 2017-03-21 18:44:17 -07:00
sysctl_net.c Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace 2016-10-06 09:52:23 -07:00