Alban Crequy 7c0cdf0b39 bpf, lpm: fix lookup bug in map_delete_elem ... trie_delete_elem() was deleting an entry even though it was not matching if the prefixlen was correct. This patch adds a check on matchlen. Reproducer: $ sudo bpftool map create /sys/fs/bpf/mylpm type lpm_trie key 8 value 1 entries 128 name mylpm flags 1 $ sudo bpftool map update pinned /sys/fs/bpf/mylpm key hex 10 00 00 00 aa bb cc dd value hex 01 $ sudo bpftool map dump pinned /sys/fs/bpf/mylpm key: 10 00 00 00 aa bb cc dd value: 01 Found 1 element $ sudo bpftool map delete pinned /sys/fs/bpf/mylpm key hex 10 00 00 00 ff ff ff ff $ echo $? 0 $ sudo bpftool map dump pinned /sys/fs/bpf/mylpm Found 0 elements A similar reproducer is added in the selftests. Without the patch: $ sudo ./tools/testing/selftests/bpf/test_lpm_map test_lpm_map: test_lpm_map.c:485: test_lpm_delete: Assertion `bpf_map_delete_elem(map_fd, key) == -1 && errno == ENOENT' failed. Aborted With the patch: test_lpm_map runs without errors. Fixes: e454cf5958 ("bpf: Implement map_delete_elem for BPF_MAP_TYPE_LPM_TRIE") Cc: Craig Gallek <kraig@google.com> Signed-off-by: Alban Crequy <alban@kinvolk.io> Acked-by: Craig Gallek <kraig@google.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>		2019-02-22 16:17:53 +01:00
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accounting
arch	powerpc fixes for 5.0 #3	2019-01-19 05:55:42 +12:00
bpf	tools: bpftool: fix crash with un-owned prog arrays	2019-01-28 23:59:46 +01:00
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include	tools uapi: fix Alpha support	2019-02-10 19:16:24 -08:00
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lib	bpf: libbpf: retry loading program on EAGAIN	2019-01-15 21:35:34 +01:00
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perf	perf script python: Add Python3 support to tests/attr.py	2019-02-05 10:31:08 -03:00
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testing	bpf, lpm: fix lookup bug in map_delete_elem	2019-02-22 16:17:53 +01:00
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