mm: initialize return of vm_insert_pages

clang static analysis reports a garbage return

  In file included from mm/memory.c:84:
  mm/memory.c:1612:2: warning: Undefined or garbage value returned to caller [core.uninitialized.UndefReturn]
          return err;
          ^~~~~~~~~~

The setting of err depends on a loop executing.  So initialize err.

Signed-off-by: Tom Rix <trix@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Link: http://lkml.kernel.org/r/20200703155354.29132-1-trix@redhat.com
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/mm/memory.c b/mm/memory.c
index 87ec87c..3ecad55 100644 (file)
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -1601,7 +1601,7 @@ int vm_insert_pages(struct vm_area_struct *vma, unsigned long addr,
        return insert_pages(vma, addr, pages, num, vma->vm_page_prot);
 #else
        unsigned long idx = 0, pgcount = *num;
-       int err;
+       int err = -EINVAL;
 
        for (; idx < pgcount; ++idx) {
                err = vm_insert_page(vma, addr + (PAGE_SIZE * idx), pages[idx]);