usercopy: Add parentheses around assignment in test_copy_struct_from_user

Clang warns:

lib/test_user_copy.c:96:10: warning: using the result of an assignment
as a condition without parentheses [-Wparentheses]
        if (ret |= test(umem_src == NULL, "kmalloc failed"))
            ~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
lib/test_user_copy.c:96:10: note: place parentheses around the
assignment to silence this warning
        if (ret |= test(umem_src == NULL, "kmalloc failed"))
                ^
            (                                              )
lib/test_user_copy.c:96:10: note: use '!=' to turn this compound
assignment into an inequality comparison
        if (ret |= test(umem_src == NULL, "kmalloc failed"))
                ^~
                !=

Add the parentheses as it suggests because this is intentional.

Fixes: f5a1a536fa14 ("lib: introduce copy_struct_from_user() helper")
Link: https://github.com/ClangBuiltLinux/linux/issues/731
Signed-off-by: Nathan Chancellor <natechancellor@gmail.com>
Acked-by: Aleksa Sarai <cyphar@cyphar.com>
Acked-by: Christian Brauner <christian.brauner@ubuntu.com>
Link: https://lore.kernel.org/r/20191003171121.2723619-1-natechancellor@gmail.com
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

diff --git a/lib/test_user_copy.c b/lib/test_user_copy.c
index 950ee88..e365ace 100644 (file)
--- a/lib/test_user_copy.c
+++ b/lib/test_user_copy.c
@@ -93,11 +93,11 @@ static int test_copy_struct_from_user(char *kmem, char __user *umem,
        size_t ksize, usize;
 
        umem_src = kmalloc(size, GFP_KERNEL);
-       if (ret |= test(umem_src == NULL, "kmalloc failed"))
+       if ((ret |= test(umem_src == NULL, "kmalloc failed")))
                goto out_free;
 
        expected = kmalloc(size, GFP_KERNEL);
-       if (ret |= test(expected == NULL, "kmalloc failed"))
+       if ((ret |= test(expected == NULL, "kmalloc failed")))
                goto out_free;
 
        /* Fill umem with a fixed byte pattern. */