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SubjectRe: KASAN: use-after-free Read in tcindex_dump
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Hello,

syzbot has tested the proposed patch and the reproducer did not trigger crash:

Reported-and-tested-by: syzbot+653090db2562495901dc@syzkaller.appspotmail.com

Tested on:

commit: 2c19e526 net_sched: hold rtnl lock for tcindex_partial_des..
git tree: https://github.com/congwang/linux.git tcindex
kernel config: https://syzkaller.appspot.com/x/.config?x=bcbe864577669742
dashboard link: https://syzkaller.appspot.com/bug?extid=653090db2562495901dc
compiler: gcc (GCC) 9.0.0 20181231 (experimental)

Note: testing is done by a robot and is best-effort only.

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