exec: setup_arg_pages() fails to return errors

In setup_arg_pages we work hard to assign a value to ret, but on exit we
always return 0.

Also remove a now duplicated exit path and branch to out_unlock instead.

Signed-off-by: Anton Blanchard <anton@samba.org>
Acked-by: Serge Hallyn <serue@us.ibm.com>
Reviewed-by: WANG Cong <xiyou.wangcong@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 3 insertions, 5 deletions

diff --git a/fs/exec.c b/fs/exec.c
index d49be6bc1793..ba112bd4a339 100644
--- a/fs/exec.c
+++ b/fs/exec.c
@@ -624,10 +624,8 @@ int setup_arg_pages(struct linux_binprm *bprm,
         /* Move stack pages down in memory. */
         if (stack_shift) {
                 ret = shift_arg_pages(vma, stack_shift);
-                if (ret) {
-                        up_write(&mm->mmap_sem);
-                        return ret;
-                }
+                if (ret)
+                        goto out_unlock;
         }
 
 #ifdef CONFIG_STACK_GROWSUP
@@ -641,7 +639,7 @@ int setup_arg_pages(struct linux_binprm *bprm,
 
 out_unlock:
         up_write(&mm->mmap_sem);
-        return 0;
+        return ret;
 }
 EXPORT_SYMBOL(setup_arg_pages);