9p/trans_fd: Fix concurrency del of req_list in p9_fd_cancelled/p9_read_work

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p9_read_work and p9_fd_cancelled may be called concurrently.
In some cases, req->req_list may be deleted by both p9_read_work
and p9_fd_cancelled.

We can fix it by ignoring replies associated with a cancelled
request and ignoring cancelled request if message has been received
before lock.

Link: http://lkml.kernel.org/r/20200612090833.36149-1-wanghai38@huawei.com
Fixes: 60ff779c4a ("9p: client: remove unused code and any reference to "cancelled" function")
Cc: <stable@vger.kernel.org> # v3.12+
Reported-by: syzbot+77a25acfa0382e06ab23@syzkaller.appspotmail.com
Signed-off-by: Wang Hai <wanghai38@huawei.com>
Signed-off-by: Dominique Martinet <asmadeus@codewreck.org>

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Wang Hai 2020-06-12 17:08:33 +08:00 • committed by Dominique Martinet

parent a39c46067c

commit 74d6a5d566

1 changed files with 14 additions and 1 deletions

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net/9p/trans_fd.c

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