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bpf: Simplify code of destroy_mem_alloc() with kmemdup(). 

Use kmemdup() to simplify the code.

Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Hou Tao <houtao1@huawei.com>
Link: https://lore.kernel.org/bpf/20230706033447.54696-3-alexei.starovoitov@gmail.com
This commit is contained in:
Alexei Starovoitov 2023-07-05 20:34:35 -07:00 committed by Daniel Borkmann
parent 12c8d0f4c8
commit a80672d7e1
1 changed files with 2 additions and 5 deletions
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7
kernel/bpf/memalloc.c
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@ -499,7 +499,7 @@ static void destroy_mem_alloc(struct bpf_mem_alloc *ma, int rcu_in_progress)
return;
}
copy = kmalloc(sizeof(*ma), GFP_KERNEL);
copy = kmemdup(ma, sizeof(*ma), GFP_KERNEL);
if (!copy) {
/* Slow path with inline barrier-s */
free_mem_alloc(ma);
@ -507,10 +507,7 @@ static void destroy_mem_alloc(struct bpf_mem_alloc *ma, int rcu_in_progress)
}
/* Defer barriers into worker to let the rest of map memory to be freed */
copy->cache = ma->cache;
ma->cache = NULL;
copy->caches = ma->caches;
ma->caches = NULL;
memset(ma, 0, sizeof(*ma));
INIT_WORK(&copy->work, free_mem_alloc_deferred);
queue_work(system_unbound_wq, &copy->work);
}