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由 valis 提交于
stable inclusion from stable-v5.10.190 commit a8d478200b104ff356f51e1f63499fe46ba8c9b8 category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/I7SAP1 CVE: CVE-2023-4128 Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=a8d478200b104ff356f51e1f63499fe46ba8c9b8 --------------------------- [ Upstream commit 76e42ae831991c828cffa8c37736ebfb831ad5ec ] 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: e35a8ee5 ("net: sched: fw use RCU") Reported-by: Nvalis <sec@valis.email> Reported-by: NBing-Jhong Billy Jheng <billy@starlabs.sg> Signed-off-by: Nvalis <sec@valis.email> Signed-off-by: NJamal Hadi Salim <jhs@mojatatu.com> Reviewed-by: NVictor Nogueira <victor@mojatatu.com> Reviewed-by: NPedro Tammela <pctammela@mojatatu.com> Reviewed-by: NM A Ramdhan <ramdhan@starlabs.sg> Link: https://lore.kernel.org/r/20230729123202.72406-3-jhs@mojatatu.comSigned-off-by: NJakub Kicinski <kuba@kernel.org> Signed-off-by: NSasha Levin <sashal@kernel.org> Signed-off-by: NLiu Jian <liujian56@huawei.com> (cherry picked from commit 11d19448)
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