lib: test_user_copy: style cleanup

While writing the tests for copy_struct_from_user(), I used a construct
that Linus doesn't appear to be too fond of:

On 2019-10-04, Linus Torvalds <torvalds@linux-foundation.org> wrote:
> Hmm. That code is ugly, both before and after the fix.
>
> This just doesn't make sense for so many reasons:
>
>         if ((ret |= test(umem_src == NULL, "kmalloc failed")))
>
> where the insanity comes from
>
>  - why "|=" when you know that "ret" was zero before (and it had to
>    be, for the test to make sense)
>
>  - why do this as a single line anyway?
>
>  - don't do the stupid "double parenthesis" to hide a warning. Make it
>    use an actual comparison if you add a layer of parentheses.

So instead, use a bog-standard check that isn't nearly as ugly.

Fixes: 341115822f88 ("usercopy: Add parentheses around assignment in test_copy_struct_from_user")
Fixes: f5a1a536fa14 ("lib: introduce copy_struct_from_user() helper")
Signed-off-by: Aleksa Sarai <cyphar@cyphar.com>
Reviewed-by: Nathan Chancellor <natechancellor@gmail.com>
Reviewed-by: Christian Brauner <christian.brauner@ubuntu.com>
Link: https://lore.kernel.org/r/20191005233028.18566-1-cyphar@cyphar.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 e365ace..ad23727 100644 (file)
--- a/lib/test_user_copy.c
+++ b/lib/test_user_copy.c
@@ -52,13 +52,14 @@ static int test_check_nonzero_user(char *kmem, char __user *umem, size_t size)
        size_t zero_end = size - zero_start;
 
        /*
-        * We conduct a series of check_nonzero_user() tests on a block of memory
-        * with the following byte-pattern (trying every possible [start,end]
-        * pair):
+        * We conduct a series of check_nonzero_user() tests on a block of
+        * memory with the following byte-pattern (trying every possible
+        * [start,end] pair):
         *
         *   [ 00 ff 00 ff ... 00 00 00 00 ... ff 00 ff 00 ]
         *
-        * And we verify that check_nonzero_user() acts identically to memchr_inv().
+        * And we verify that check_nonzero_user() acts identically to
+        * memchr_inv().
         */
 
        memset(kmem, 0x0, size);
@@ -93,11 +94,13 @@ 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")))
+       ret = test(umem_src == NULL, "kmalloc failed");
+       if (ret)
                goto out_free;
 
        expected = kmalloc(size, GFP_KERNEL);
-       if ((ret |= test(expected == NULL, "kmalloc failed")))
+       ret = test(expected == NULL, "kmalloc failed");
+       if (ret)
                goto out_free;
 
        /* Fill umem with a fixed byte pattern. */