diff options
| author | Eric Dumazet <edumazet@google.com> | 2021-11-05 13:39:59 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2021-11-06 13:30:37 -0700 |
| commit | 084f7e2377e89ccbc8375b5486c6b4c16682f602 (patch) | |
| tree | a938f200a844765a359ffbe5783b0eba4e7c2fdd /mm/page_alloc.c | |
| parent | 34b46efd6ec6a6f2d6a57be4216b820c879a0030 (diff) | |
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@gmail.com
Fixes: 121e6f3258fe ("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>
Diffstat (limited to 'mm/page_alloc.c')
| -rw-r--r-- | mm/page_alloc.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/mm/page_alloc.c b/mm/page_alloc.c index 23d3339ac4e8..133dad9f4669 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -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 |