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    Subject[patch 10/55] proc: mem_release() should check mm != NULL
    3.0-stable review patch.  If anyone has any objections, please let me know.

    ------------------

    From: Oleg Nesterov <oleg@redhat.com>

    commit 71879d3cb3dd8f2dfdefb252775c1b3ea04a3dd4 upstream.

    mem_release() can hit mm == NULL, add the necessary check.

    Signed-off-by: Oleg Nesterov <oleg@redhat.com>
    Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

    ---
    fs/proc/base.c | 4 ++--
    1 file changed, 2 insertions(+), 2 deletions(-)

    --- a/fs/proc/base.c
    +++ b/fs/proc/base.c
    @@ -886,8 +886,8 @@ loff_t mem_lseek(struct file *file, loff
    static int mem_release(struct inode *inode, struct file *file)
    {
    struct mm_struct *mm = file->private_data;
    -
    - mmput(mm);
    + if (mm)
    + mmput(mm);
    return 0;
    }




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