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| author |   Yuan Chen <chenyuan@kylinos.cn> | 2025-06-18 09:19:33 +0800 |
|---|---|---|
| committer |   Andrii Nakryiko <andrii@kernel.org> | 2025-06-23 11:13:40 -0700 |
| commit | aa485e8789d56a4573f7c8d000a182b749eaa64d (patch) | |
| tree | 5ae84d0ea7fd6c9b972950601d6a5ab7eada9fae /tools/lib/bpf/btf_dump.c | |
| parent | bpf: Adjust free target to avoid global starvation of LRU map (diff) | |
| download | wireguard-linux-aa485e8789d56a4573f7c8d000a182b749eaa64d.tar.xz wireguard-linux-aa485e8789d56a4573f7c8d000a182b749eaa64d.zip | |
libbpf: Fix null pointer dereference in btf_dump__free on allocation failure
When btf_dump__new() fails to allocate memory for the internal hashmap
(btf_dump->type_names), it returns an error code. However, the cleanup
function btf_dump__free() does not check if btf_dump->type_names is NULL
before attempting to free it. This leads to a null pointer dereference
when btf_dump__free() is called on a btf_dump object.
Fixes: 351131b51c7a ("libbpf: add btf_dump API for BTF-to-C conversion")
Signed-off-by: Yuan Chen <chenyuan@kylinos.cn>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20250618011933.11423-1-chenyuan_fl@163.com
Diffstat (limited to '')
| -rw-r--r-- | tools/lib/bpf/btf_dump.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/tools/lib/bpf/btf_dump.c b/tools/lib/bpf/btf_dump.c index 460c3e57fadb..0381f209920a 100644 --- a/tools/lib/bpf/btf_dump.c +++ b/tools/lib/bpf/btf_dump.c @@ -226,6 +226,9 @@ static void btf_dump_free_names(struct hashmap *map) size_t bkt; struct hashmap_entry *cur; + if (!map) + return; + hashmap__for_each_entry(map, cur, bkt) free((void *)cur->pkey); |