[PATCH] test_meminit: use GFP_ATOMIC in RCU critical section

[Alexander Potapenko]

kmalloc() shouldn't sleep while in RCU critical section, therefore
use GFP_ATOMIC instead of GFP_KERNEL.

The bug has been spotted by the 0day kernel testing robot.

Fixes: 7e659650cbda ("lib: introduce test_meminit module")
Signed-off-by: Alexander Potapenko <gli...@google.com>
Cc: Kees Cook <keesc...@chromium.org>
Cc: Andrew Morton <a...@linux-foundation.org>
Cc: linux-kernel@vger.kernel.org
Cc: linux...@kvack.org
Cc: linux-security-mod...@vger.kernel.org
---
 lib/test_meminit.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/test_meminit.c b/lib/test_meminit.c
index 62d19f270cad..9729f271d150 100644
--- a/lib/test_meminit.c
+++ b/lib/test_meminit.c
@@ -222,7 +222,7 @@ static int __init do_kmem_cache_size(size_t size, bool 
want_ctor,
                 * Copy the buffer to check that it's not wiped on
                 * free().
                 */
-               buf_copy = kmalloc(size, GFP_KERNEL);
+               buf_copy = kmalloc(size, GFP_ATOMIC);
                if (buf_copy)
                        memcpy(buf_copy, buf, size);
 
-- 
2.22.0.657.g960e92d24f-goog