]> git.proxmox.com Git - mirror_ubuntu-kernels.git/commit
mm, slab: check GFP_SLAB_BUG_MASK before alloc_pages in kmalloc_order
authorLong Li <lonuxli.64@gmail.com>
Fri, 7 Aug 2020 06:18:28 +0000 (23:18 -0700)
committerLinus Torvalds <torvalds@linux-foundation.org>
Fri, 7 Aug 2020 18:33:22 +0000 (11:33 -0700)
commit444050990db4abdf0c85ca6050542b888ba316a1
tree94acbfbb4ec5aef67b237176977b953c7c8ad929
parentdabc3e291d56e3125113101bc6d53d1a1738294d
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>
mm/slab.c
mm/slab.h
mm/slab_common.c
mm/slub.c