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linux/drivers/net/ppp
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Asim Viladi Oglu Manizada 6eed5ae788 pppoe: reload header pointer after dev_hard_header() 
commit e9c238f6fe upstream.

pppoe_sendmsg() saves a pointer to the PPPoE header before calling
dev_hard_header(). Device header callbacks are allowed to reallocate the
skb head, invalidating pointers into it.

This can happen when a send is blocked in copy_from_user() while the first
non-Ethernet port is added to an empty team device. The team's delegated
GRE header callback then expands the skb head. PPPoE subsequently writes
six bytes through the stale pointer into the freed head.

Reload the PPPoE header through the skb's network-header offset after
device header creation. pskb_expand_head() updates that offset when it
relocates the head.

Fixes: 1da177e4c3 ("Linux-2.6.12-rc2")
Cc: stable@vger.kernel.org
Signed-off-by: Asim Viladi Oglu Manizada <manizada@pm.me>
Reviewed-by: Vadim Fedorenko <vadim.fedorenko@linux.dev>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Link: https://patch.msgid.link/20260722093814.3017176-1-manizada@pm.me
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
History 2026-08-19 17:14:04 +02:00
..
bsd_comp.c net: ppp: remove leading spaces before tabs 2021-05-20 15:10:57 -07:00
Kconfig treewide: replace '---help---' in Kconfig files with 'help' 2020-06-14 01:57:21 +09:00
Makefile License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
ppp_async.c ppp: fix ppp_async_encode() illegal access 2024-10-17 15:11:58 +02:00
ppp_deflate.c ppp: deflate: Remove useless call "zlib_inflateEnd" 2021-03-30 16:59:30 -07:00
ppp_generic.c ppp: defer channel free to an RCU grace period to fix pppol2tp RX UAF 2026-08-19 17:13:53 +02:00
ppp_mppe.c mm, treewide: rename kzfree() to kfree_sensitive() 2020-08-07 11:33:22 -07:00
ppp_mppe.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
ppp_synctty.c net: ppp: Add bound checking for skb data on ppp_sync_txmung 2025-05-02 07:43:52 +02:00
pppoe.c pppoe: reload header pointer after dev_hard_header() 2026-08-19 17:14:04 +02:00
pppox.c compat_ioctl: pppoe: fix PPPOEIOCSFWD handling 2019-07-30 14:42:13 -07:00
pptp.c pptp: fix pptp_xmit() error path 2025-08-28 16:24:14 +02:00