tree 26089ab11444318b9ba783753c3515bdda6da7cf
parent 2bc3d6ac704ea7263175ea3da663fdbbb7f3dd8b
author valis <sec@valis.email> 1690633921 -0400
committer Greg Kroah-Hartman <gregkh@linuxfoundation.org> 1695458826 +0200

net/sched: cls_fw: No longer copy tcf_result on update to avoid use-after-free

commit 76e42ae831991c828cffa8c37736ebfb831ad5ec upstream.

When fw_change() is called on an existing filter, the whole
tcf_result struct is always copied into the new instance of the filter.

This causes a problem when updating a filter bound to a class,
as tcf_unbind_filter() is always called on the old instance in the
success path, decreasing filter_cnt of the still referenced class
and allowing it to be deleted, leading to a use-after-free.

Fix this by no longer copying the tcf_result struct from the old filter.

Fixes: e35a8ee5993b ("net: sched: fw use RCU")
Reported-by: valis <sec@valis.email>
Reported-by: Bing-Jhong Billy Jheng <billy@starlabs.sg>
Signed-off-by: valis <sec@valis.email>
Signed-off-by: Jamal Hadi Salim <jhs@mojatatu.com>
Reviewed-by: Victor Nogueira <victor@mojatatu.com>
Reviewed-by: Pedro Tammela <pctammela@mojatatu.com>
Reviewed-by: M A Ramdhan <ramdhan@starlabs.sg>
Link: https://lore.kernel.org/r/20230729123202.72406-3-jhs@mojatatu.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
[ Fixed small conflict as 'fnew->ifindex' assignment is not protected by
  CONFIG_NET_CLS_IND on upstream since a51486266c3 ]
Signed-off-by: Luiz Capitulino <luizcap@amazon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>