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    Subject[patch 15/26] wrong error path in dup_fd() leading to oopses in RCU

    From: Kirill Korotaev <>

    [PATCH] wrong error path in dup_fd() leading to oopses in RCU

    Wrong error path in dup_fd() - it should return NULL on error,
    not an address of already freed memory :/

    Triggered by OpenVZ stress test suite.

    What is interesting is that it was causing different oopses in RCU like
    Call Trace:
    [<c013492c>] rcu_do_batch+0x2c/0x80
    [<c0134bdd>] rcu_process_callbacks+0x3d/0x70
    [<c0126cf3>] tasklet_action+0x73/0xe0
    [<c01269aa>] __do_softirq+0x10a/0x130
    [<c01058ff>] do_softirq+0x4f/0x60
    [<c0113817>] smp_apic_timer_interrupt+0x77/0x110
    [<c0103b54>] apic_timer_interrupt+0x1c/0x24
    Code: Bad EIP value.
    <0>Kernel panic - not syncing: Fatal exception in interrupt

    Signed-Off-By: Pavel Emelianov <>
    Signed-Off-By: Dmitry Mishin <>
    Signed-Off-By: Kirill Korotaev <>
    Signed-Off-By: Linus Torvalds <>
    Signed-off-by: Greg Kroah-Hartman <>

    kernel/fork.c | 2 +-
    1 file changed, 1 insertion(+), 1 deletion(-)

    --- linux-
    +++ linux-
    @@ -720,7 +720,7 @@ out_release:
    free_fdset (new_fdt->open_fds, new_fdt->max_fdset);
    free_fd_array(new_fdt->fd, new_fdt->max_fds);
    kmem_cache_free(files_cachep, newf);
    - goto out;
    + return NULL;

    static int copy_files(unsigned long clone_flags, struct task_struct * tsk)
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      Last update: 2006-04-05 02:09    [W:0.020 / U:52.704 seconds]
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