bpf: refactor __bpf_list_add to take insertion point via **prev_ptr

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Refactor __bpf_list_add to accept (node, head, struct list_head **prev_ptr,
..) instead of (node, head, bool tail, ..). Load prev from *prev_ptr after
INIT_LIST_HEAD(h), so we never dereference an uninitialized h->prev when
head was 0-initialized (e.g. push_back passes &h->prev).

When prev is not the list head, validate that prev is in the list via
its owner.

Prepares for bpf_list_add(head, new, prev, ..) to insert after a given
list node.

Signed-off-by: Kaitao Cheng <chengkaitao@kylinos.cn>
Reviewed-by: Eduard Zingerman <eddyz87@gmail.com>
Link: https://lore.kernel.org/r/20260521032306.97118-6-kaitao.cheng@linux.dev
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

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This commit is contained in:

Kaitao Cheng 2026-05-21 11:23:03 +08:00 • committed by Alexei Starovoitov

parent 187baa1096

commit e6919ff67c

1 changed files with 26 additions and 10 deletions

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kernel/bpf/helpers.c

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