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| author | Kees Cook <keescook@chromium.org> | 2020-06-03 13:28:45 -0700 |
|---|---|---|
| committer | Kees Cook <keescook@chromium.org> | 2020-07-16 12:32:26 -0700 |
| commit | fea1120c56e2d5db1cfea67d455edea3f4f97947 (patch) | |
| tree | e38e912036167ddca003347353221935eb1da9c3 /mm | |
| parent | 4df7a75f690a2651d766cc45d442824b955f9e4b (diff) | |
| download | lwn-fea1120c56e2d5db1cfea67d455edea3f4f97947.tar.gz lwn-fea1120c56e2d5db1cfea67d455edea3f4f97947.zip | |
mm/debug_vm_pgtable: Remove uninitialized_var() usage
Using uninitialized_var() is dangerous as it papers over real bugs[1]
(or can in the future), and suppresses unrelated compiler warnings (e.g.
"unused variable"). If the compiler thinks it is uninitialized, either
simply initialize the variable or make compiler changes. As a precursor
to removing[2] this[3] macro[4], just initialize this variable to NULL.
[1] https://lore.kernel.org/lkml/20200603174714.192027-1-glider@google.com/
[2] https://lore.kernel.org/lkml/CA+55aFw+Vbj0i=1TGqCR5vQkCzWJ0QxK6CernOU6eedsudAixw@mail.gmail.com/
[3] https://lore.kernel.org/lkml/CA+55aFwgbgqhbp1fkxvRKEpzyR5J8n1vKT1VZdz9knmPuXhOeg@mail.gmail.com/
[4] https://lore.kernel.org/lkml/CA+55aFz2500WfbKXAx8s67wrm9=yVJu65TpLgN_ybYNv0VEOKA@mail.gmail.com/
Fixes: 399145f9eb6c ("mm/debug: add tests validating architecture page table helpers")
Reviewed-by: Nick Desaulniers <ndesaulniers@google.com>
Signed-off-by: Kees Cook <keescook@chromium.org>
Diffstat (limited to 'mm')
| -rw-r--r-- | mm/debug_vm_pgtable.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/mm/debug_vm_pgtable.c b/mm/debug_vm_pgtable.c index 61ab16fb2e36..d315ff544f05 100644 --- a/mm/debug_vm_pgtable.c +++ b/mm/debug_vm_pgtable.c @@ -307,7 +307,7 @@ static int __init debug_vm_pgtable(void) phys_addr_t paddr; unsigned long vaddr, pte_aligned, pmd_aligned; unsigned long pud_aligned, p4d_aligned, pgd_aligned; - spinlock_t *uninitialized_var(ptl); + spinlock_t *ptl = NULL; pr_info("Validating architecture page table helpers\n"); prot = vm_get_page_prot(VMFLAGS); |