The patch titled
Subject: mm/large system hash: avoid possible NULL deref in alloc_large_system_hash
has been added to the -mm tree. Its filename is
mm-large-system-hash-avoid-possible-null-deref-in-alloc_large_system_hash.patch
This patch should soon appear at
https://ozlabs.org/~akpm/mmots/broken-out/mm-large-system-hash-avoid-possible-null-deref-in-alloc_large_system_hash.patch
and later at
https://ozlabs.org/~akpm/mmotm/broken-out/mm-large-system-hash-avoid-possible-null-deref-in-alloc_large_system_hash.patch
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------------------------------------------------------
From: Eric Dumazet <edumazet@xxxxxxxxxx>
Subject: mm/large system hash: avoid possible NULL deref in alloc_large_system_hash
If __vmalloc() returned NULL, is_vm_area_hugepages(NULL) will fault if
CONFIG_HAVE_ARCH_HUGE_VMALLOC=y
Link: https://lkml.kernel.org/r/20210915212530.2321545-1-eric.dumazet@xxxxxxxxx
Fixes: 121e6f3258fe ("mm/vmalloc: hugepage vmalloc mappings")
Signed-off-by: Eric Dumazet <edumazet@xxxxxxxxxx>
Reviewed-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Cc: Nicholas Piggin <npiggin@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/page_alloc.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
--- a/mm/page_alloc.c~mm-large-system-hash-avoid-possible-null-deref-in-alloc_large_system_hash
+++ a/mm/page_alloc.c
@@ -8756,7 +8756,8 @@ void *__init alloc_large_system_hash(con
} else if (get_order(size) >= MAX_ORDER || hashdist) {
table = __vmalloc(size, gfp_flags);
virt = true;
- huge = is_vm_area_hugepages(table);
+ if (table)
+ huge = is_vm_area_hugepages(table);
} else {
/*
* If bucketsize is not a power-of-two, we may free
_
Patches currently in -mm which might be from edumazet@xxxxxxxxxx are
mm-large-system-hash-avoid-possible-null-deref-in-alloc_large_system_hash.patch
