bpf: Compare parent_id in refsafe() for REF_TYPE_PTR

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refsafe() compared each reference's id and type but not its parent_id,
so two states whose PTR references differ only in the parent object they
were derived from could be wrongly treated as equivalent and pruned. Fix
it by checking parent_id too.

Fixes: 308c7a0ae8 ("bpf: Refactor object relationship tracking and fix dynptr UAF bug")
Signed-off-by: Amery Hung <ameryhung@gmail.com>
Link: https://lore.kernel.org/r/20260605202056.1780352-4-ameryhung@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

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Amery Hung 2026-06-05 13:20:54 -07:00 • committed by Alexei Starovoitov

parent 73d475dc6c

commit 41025f441f

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kernel/bpf/states.c

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