linux-kernel - Re: next: LTP: syscalls: epoll_clt() if fd is an invalid fd expected EBADF: EINVAL (22)

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Message-ID: <b7d8193c-7e15-f5cd-08d4-8ef788d9bb36@kernel.dk>
Date:   Wed, 7 Dec 2022 09:22:45 -0700
From:   Jens Axboe <axboe@...nel.dk>
To:     Naresh Kamboju <naresh.kamboju@...aro.org>,
        open list <linux-kernel@...r.kernel.org>,
        linux-fsdevel@...r.kernel.org, regressions@...ts.linux.dev,
        lkft-triage@...ts.linaro.org,
        Linux-Next Mailing List <linux-next@...r.kernel.org>,
        LTP List <ltp@...ts.linux.it>
Cc:     Alexander Viro <viro@...iv.linux.org.uk>,
        Anders Roxell <anders.roxell@...aro.org>,
        Arnd Bergmann <arnd@...db.de>, chrubis <chrubis@...e.cz>
Subject: Re: next: LTP: syscalls: epoll_clt() if fd is an invalid fd expected
 EBADF: EINVAL (22)

On 12/7/22 8:58?AM, Naresh Kamboju wrote:
> LTP syscalls epoll_ctl02 is failing on Linux next master.
> The reported problem is always reproducible and starts from next-20221205.
> 
> GOOD tag: next-20221202
> BAD tag: next-20221205
> 
> tst_test.c:1524: TINFO: Timeout per run is 0h 05m 00s
> epoll_ctl02.c:87: TPASS: epoll_clt(...) if epfd is an invalid fd : EBADF (9)
> epoll_ctl02.c:87: TPASS: epoll_clt(...) if fd does not support epoll : EPERM (1)
> epoll_ctl02.c:87: TFAIL: epoll_clt(...) if fd is an invalid fd
> expected EBADF: EINVAL (22)
> epoll_ctl02.c:87: TPASS: epoll_clt(...) if op is not supported : EINVAL (22)
> epoll_ctl02.c:87: TPASS: epoll_clt(...) if fd is the same as epfd : EINVAL (22)
> epoll_ctl02.c:87: TPASS: epoll_clt(...) if events is NULL : EFAULT (14)
> epoll_ctl02.c:87: TPASS: epoll_clt(...) if fd is not registered with
> EPOLL_CTL_DEL : ENOENT (2)
> epoll_ctl02.c:87: TPASS: epoll_clt(...) if fd is not registered with
> EPOLL_CTL_MOD : ENOENT (2)
> epoll_ctl02.c:87: TPASS: epoll_clt(...) if fd is already registered
> with EPOLL_CTL_ADD : EEXIST (17)

This should fix it:


diff --git a/fs/eventpoll.c b/fs/eventpoll.c
index ec7ffce8265a..de9c551e1993 100644
--- a/fs/eventpoll.c
+++ b/fs/eventpoll.c
@@ -2195,6 +2195,7 @@ int do_epoll_ctl(int epfd, int op, int fd, struct epoll_event *epds,
 	}
 
 	/* Get the "struct file *" for the target file */
+	error = -EBADF;
 	tf = fdget(fd);
 	if (!tf.file)
 		goto error_fput;

-- 
Jens Axboe