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| author | Long Li <lonuxli.64@gmail.com> | 2020-08-06 23:18:28 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2020-08-07 11:33:22 -0700 |
| commit | 444050990db4abdf0c85ca6050542b888ba316a1 (patch) | |
| tree | 94acbfbb4ec5aef67b237176977b953c7c8ad929 /mm/slab.h | |
| parent | dabc3e291d56e3125113101bc6d53d1a1738294d (diff) | |
| download | linux-stable-444050990db4abdf0c85ca6050542b888ba316a1.tar.gz linux-stable-444050990db4abdf0c85ca6050542b888ba316a1.tar.bz2 linux-stable-444050990db4abdf0c85ca6050542b888ba316a1.zip | |
mm, slab: check GFP_SLAB_BUG_MASK before alloc_pages in kmalloc_order
kmalloc cannot allocate memory from HIGHMEM. Allocating large amounts of
memory currently bypasses the check and will simply leak the memory when
page_address() returns NULL. To fix this, factor the GFP_SLAB_BUG_MASK
check out of slab & slub, and call it from kmalloc_order() as well. In
order to make the code clear, the warning message is put in one place.
Signed-off-by: Long Li <lonuxli.64@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Reviewed-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Pekka Enberg <penberg@kernel.org>
Acked-by: David Rientjes <rientjes@google.com>
Cc: Christoph Lameter <cl@linux.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Link: http://lkml.kernel.org/r/20200704035027.GA62481@lilong
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/slab.h')
| -rw-r--r-- | mm/slab.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/mm/slab.h b/mm/slab.h index 74f7e09a7cfd..58ed025a0b23 100644 --- a/mm/slab.h +++ b/mm/slab.h @@ -152,6 +152,7 @@ void create_kmalloc_caches(slab_flags_t); struct kmem_cache *kmalloc_slab(size_t, gfp_t); #endif +gfp_t kmalloc_fix_flags(gfp_t flags); /* Functions provided by the slab allocators */ int __kmem_cache_create(struct kmem_cache *, slab_flags_t flags); |