linux-kernel - Re: next: qemu-arm64: kernel BUG at fs/inode.c:1763!

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Message-ID: <5d48dd9a-1822-4917-a77e-193a48ed3bd8@kili.mountain>
Date:   Fri, 19 May 2023 19:14:10 +0300
From:   Dan Carpenter <dan.carpenter@...aro.org>
To:     Chuck Lever III <chuck.lever@...cle.com>
Cc:     Naresh Kamboju <naresh.kamboju@...aro.org>,
        Linux-Next Mailing List <linux-next@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>,
        linux-fsdevel <linux-fsdevel@...r.kernel.org>,
        linux-mm <linux-mm@...ck.org>,
        "lkft-triage@...ts.linaro.org" <lkft-triage@...ts.linaro.org>,
        Al Viro <viro@...iv.linux.org.uk>,
        Christian Brauner <brauner@...nel.org>,
        "Paul E. McKenney" <paulmck@...nel.org>,
        "frederic@...nel.org" <frederic@...nel.org>,
        Arnd Bergmann <arnd@...db.de>,
        Anders Roxell <anders.roxell@...aro.org>,
        Jakub Kacinski <kuba@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Netdev <netdev@...r.kernel.org>
Subject: Re: next: qemu-arm64: kernel BUG at fs/inode.c:1763!

Btw, Smatch doesn't like that file at all...

	sock->file = sock_alloc_file(sock, O_NONBLOCK, NULL);
        ^^^^                         ^^^^

sock_alloc_file() calls release_sock() on error but the left hand
side of the assignment dereferences "sock".  This isn't the bug and I
didn't report this earlier because there is an assert that it doesn't
fail.

net/handshake/handshake-test.c:221 handshake_req_submit_test4() error: dereferencing freed memory 'sock'
net/handshake/handshake-test.c:233 handshake_req_submit_test4() warn: 'req' was already freed.
net/handshake/handshake-test.c:254 handshake_req_submit_test5() error: dereferencing freed memory 'sock'
net/handshake/handshake-test.c:290 handshake_req_submit_test6() error: dereferencing freed memory 'sock'
net/handshake/handshake-test.c:321 handshake_req_cancel_test1() error: dereferencing freed memory 'sock'
net/handshake/handshake-test.c:355 handshake_req_cancel_test2() error: dereferencing freed memory 'sock'
net/handshake/handshake-test.c:367 handshake_req_cancel_test2() warn: 'req' was already freed.
net/handshake/handshake-test.c:395 handshake_req_cancel_test3() error: dereferencing freed memory 'sock'
net/handshake/handshake-test.c:407 handshake_req_cancel_test3() warn: 'req' was already freed.
net/handshake/handshake-test.c:451 handshake_req_destroy_test1() error: dereferencing freed memory 'sock'
net/handshake/handshake-test.c:463 handshake_req_destroy_test1() warn: 'req' was already freed.

regards,
dan carpenter