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authorLong Li <lonuxli.64@gmail.com>2020-08-06 23:18:28 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2020-08-07 11:33:22 -0700
commit444050990db4abdf0c85ca6050542b888ba316a1 (patch)
tree94acbfbb4ec5aef67b237176977b953c7c8ad929 /mm/slab.h
parentdabc3e291d56e3125113101bc6d53d1a1738294d (diff)
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.h1
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);