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Commit 9a3efb6b authored by Yonghong Song's avatar Yonghong Song Committed by Alexei Starovoitov
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bpf: fix memory leak in lpm_trie map_free callback function



There is a memory leak happening in lpm_trie map_free callback
function trie_free. The trie structure itself does not get freed.

Also, trie_free function did not do synchronize_rcu before freeing
various data structures. This is incorrect as some rcu_read_lock
region(s) for lookup, update, delete or get_next_key may not complete yet.
The fix is to add synchronize_rcu in the beginning of trie_free.
The useless spin_lock is removed from this function as well.

Fixes: b95a5c4d ("bpf: add a longest prefix match trie map implementation")
Reported-by: default avatarMathieu Malaterre <malat@debian.org>
Reported-by: default avatarAlexei Starovoitov <ast@kernel.org>
Tested-by: default avatarMathieu Malaterre <malat@debian.org>
Signed-off-by: default avatarYonghong Song <yhs@fb.com>
Signed-off-by: default avatarAlexei Starovoitov <ast@kernel.org>
parent d4014d8c
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