Re: [patch] pipe: Don't oops when pipe filesystem isn't mounted

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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 

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