Jakub Kicinski c376227845 net: mpls: fix stale pointer if allocation fails during device rename ... commit fda6c89fe3 upstream. lianhui reports that when MPLS fails to register the sysctl table under new location (during device rename) the old pointers won't get overwritten and may be freed again (double free). Handle this gracefully. The best option would be unregistering the MPLS from the device completely on failure, but unfortunately mpls_ifdown() can fail. So failing fully is also unreliable. Another option is to register the new table first then only remove old one if the new one succeeds. That requires more code, changes order of notifications and two tables may be visible at the same time. sysctl point is not used in the rest of the code - set to NULL on failures and skip unregister if already NULL. Reported-by: lianhui tang <bluetlh@gmail.com> Fixes: 0fae3bf018 ("mpls: handle device renames for per-device sysctls") Signed-off-by: Jakub Kicinski <kuba@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2023-02-22 12:59:53 +01:00
..
Kconfig	treewide: replace '---help---' in Kconfig files with 'help'	2020-06-14 01:57:21 +09:00
Makefile	treewide: Add SPDX license identifier - Makefile/Kconfig	2019-05-21 10:50:46 +02:00
af_mpls.c	net: mpls: fix stale pointer if allocation fails during device rename	2023-02-22 12:59:53 +01:00
internal.h	Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net	2021-12-02 11:44:56 -08:00
mpls_gso.c	net: avoid infinite loop in mpls_gso_segment when mpls_hlen == 0	2021-03-09 16:12:20 -08:00
mpls_iptunnel.c	mpls: load mpls_gso after mpls_iptunnel	2020-10-20 21:16:45 -07:00