From 300108740b659c2380a731f147dd85ca0365db4f Mon Sep 17 00:00:00 2001 From: Kees Cook Date: Tue, 19 Jul 2016 13:04:14 -0700 Subject: [PATCH] lkdtm: fix false positive warning from -Wmaybe-uninitialized The variable in use here doesn't matter (it's just used to exercise taking up stack space), but this changes its use to pass its address instead, to avoid a compiler warning: drivers/misc/lkdtm_usercopy.c:54:15: warning: 'bad_stack' may be used uninitialized in this function [-Wmaybe-uninitialized] Reported-by: Arnd Bergmann Signed-off-by: Kees Cook --- drivers/misc/lkdtm_usercopy.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/misc/lkdtm_usercopy.c b/drivers/misc/lkdtm_usercopy.c index 5a3fd76..5525a20 100644 --- a/drivers/misc/lkdtm_usercopy.c +++ b/drivers/misc/lkdtm_usercopy.c @@ -49,7 +49,7 @@ static noinline void do_usercopy_stack(bool to_user, bool bad_frame) /* This is a pointer to outside our current stack frame. */ if (bad_frame) { - bad_stack = do_usercopy_stack_callee((uintptr_t)bad_stack); + bad_stack = do_usercopy_stack_callee((uintptr_t)&bad_stack); } else { /* Put start address just inside stack. */ bad_stack = task_stack_page(current) + THREAD_SIZE; -- 2.7.4