git.kernel.dk Git - linux-2.6-block.git/commit

author	Miaohe Lin <linmiaohe@huawei.com>
	Fri, 29 Apr 2022 06:40:43 +0000 (14:40 +0800)
committer	akpm <akpm@linux-foundation.org>
	Fri, 27 May 2022 16:33:43 +0000 (09:33 -0700)
commit	7c61c35bbd6a888416e5a6de8ff8782a70d013d4
tree	d062095fadf78cede1c32b05ceb42f05ad98d234	tree \| snapshot
parent	4c6bdb36408fbe4697eb9f1d95a3ddc1d2348448	commit \| diff

mm/z3fold: fix possible null pointer dereferencing

alloc_slots could fail to allocate memory under heavy memory pressure. So
we should check zhdr->slots against NULL to avoid future null pointer
dereferencing.

Link: https://lkml.kernel.org/r/20220429064051.61552-3-linmiaohe@huawei.com
Fixes: fc5488651c7d ("z3fold: simplify freeing slots")
Signed-off-by: Miaohe Lin <linmiaohe@huawei.com>
Reviewed-by: Vitaly Wool <vitaly.wool@konsulko.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>