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    SubjectRe: [patch] pipe: Don't oops when pipe filesystem isn't mounted
    Linus Torvalds wrote:
    >
    > On Mon, 11 Dec 2006, Chuck Ebbert wrote:
    >> Prevent oops when an app tries to create a pipe while pipefs
    >> is not mounted.
    >
    > Have you actually seen this, or is this just from looking at code?
    >
    > Quite frankly, if "pipe_mnt" is ever NULL, we're dead for lots of other
    > reasons.
    >
    > In fact, pipe_mnt can't be NULL. The way it is initialized is:
    >
    > pipe_mnt = kern_mount(&pipe_fs_type);
    >
    > and pipe_mnt doesn't even return NULL - it returns an error pointer, so if
    > "kern_mount()" were to have failed, pipe_mnt will be some random invalid
    > pointer that could only be tested with IS_ERR(), not by comparing against
    > NULL.

    http://marc.theaimsgroup.com/?t=116510390600001&r=1&w=2

    /mjt
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