filldir[64] oddness

[Dave Jones <davej@redhat.com>]

I'm puzzled by an aparent use of uninitialised memory
that coverity's checker picked up.

fs/readdir.c

#define NAME_OFFSET(de) ((int) ((de)->d_name - (char __user *) (de)))
#define ROUND_UP(x) (((x)+sizeof(long)-1) & ~(sizeof(long)-1))

140  	static int filldir(void * __buf, const char * name, int namlen, loff_t offset,
141  			   ino_t ino, unsigned int d_type)
142  	{
143  		struct linux_dirent __user * dirent;
144  		struct getdents_callback * buf = (struct getdents_callback *) __buf
145  		int reclen = ROUND_UP(NAME_OFFSET(dirent) + namlen + 2);

How come that NAME_OFFSET isn't causing an oops when
it dereferences stackjunk->d_name ?

		Dave

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