Bad error return after find_vma() in PR_SET_MM code

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[Bother! Resending with corrected subject line (was "[PATCH 1/2]
prctl: Add PR_SET_MM option description")]

Cyrill,

While reviewing your patch to the prctl() manual page, I noticed the
following code in kernel/sys.c::prctl_set_mm():

       if (opt != PR_SET_MM_START_BRK && opt != PR_SET_MM_BRK) {
               /* It must be existing VMA */
               if (!vma || vma->vm_start > addr)
                       goto out;
       }

At this point, the code causes an exit with error set to zero (i.e.,
success). This looks unintended to me. Is the code correct? I suspect
a return of -EFAULT or -ENOMEM is warranted.

Cheers,

Michael

--
Michael Kerrisk
Linux man-pages maintainer; http://www.kernel.org/doc/man-pages/
Author of "The Linux Programming Interface"; http://man7.org/tlpi/
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