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authorAleksa Sarai <cyphar@cyphar.com>2019-10-06 10:30:28 +1100
committerChristian Brauner <christian.brauner@ubuntu.com>2019-10-07 02:03:07 +0200
commitc90012ac85c24547e5c3468ef00aabf44aa7332d (patch)
treebd1f9f766105c864a30c4278ad1cbc59887a74aa /lib/test_user_copy.c
parentda0c9ea146cbe92b832f1b0f694840ea8eb33cce (diff)
downloadlwn-c90012ac85c24547e5c3468ef00aabf44aa7332d.tar.gz
lwn-c90012ac85c24547e5c3468ef00aabf44aa7332d.zip
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>
Diffstat (limited to 'lib/test_user_copy.c')
-rw-r--r--lib/test_user_copy.c15
1 files changed, 9 insertions, 6 deletions
diff --git a/lib/test_user_copy.c b/lib/test_user_copy.c
index e365ace06538..ad2372727b1b 100644
--- 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. */