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Subject[PATCH v2 2/2] mm/memory-failure.c: Don't access uninitialized memmaps in memory_failure()
Date
We should check for pfn_to_online_page() to not access uninitialized
memmaps. Reshuffle the code so we don't have to duplicate the error
message.

Cc: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Michal Hocko <mhocko@kernel.org>
Signed-off-by: David Hildenbrand <david@redhat.com>
---
mm/memory-failure.c | 14 ++++++++------
1 file changed, 8 insertions(+), 6 deletions(-)

diff --git a/mm/memory-failure.c b/mm/memory-failure.c
index 7ef849da8278..e866e6e5660b 100644
--- a/mm/memory-failure.c
+++ b/mm/memory-failure.c
@@ -1253,17 +1253,19 @@ int memory_failure(unsigned long pfn, int flags)
if (!sysctl_memory_failure_recovery)
panic("Memory failure on page %lx", pfn);

- if (!pfn_valid(pfn)) {
+ p = pfn_to_online_page(pfn);
+ if (!p) {
+ if (pfn_valid(pfn)) {
+ pgmap = get_dev_pagemap(pfn, NULL);
+ if (pgmap)
+ return memory_failure_dev_pagemap(pfn, flags,
+ pgmap);
+ }
pr_err("Memory failure: %#lx: memory outside kernel control\n",
pfn);
return -ENXIO;
}

- pgmap = get_dev_pagemap(pfn, NULL);
- if (pgmap)
- return memory_failure_dev_pagemap(pfn, flags, pgmap);
-
- p = pfn_to_page(pfn);
if (PageHuge(p))
return memory_failure_hugetlb(pfn, flags);
if (TestSetPageHWPoison(p)) {
--
2.21.0
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