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mm/large system hash: avoid possible NULL deref in alloc_large_system_hash

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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@gmail.com
Fixes: 121e6f3258 ("mm/vmalloc: hugepage vmalloc mappings")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Eric Dumazet 2021-11-05 13:39:59 -07:00 committed by Linus Torvalds
parent 34b46efd6e
commit 084f7e2377
1 changed files with 2 additions and 1 deletions
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3
mm/page_alloc.c
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@ -8762,7 +8762,8 @@ void *__init alloc_large_system_hash(const char *tablename,
} 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