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libbpf: Fix null pointer dereference in btf_dump__free on allocation failure

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[ Upstream commit aa485e8789 ]

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: 351131b51c ("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
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Yuan Chen 2025-06-18 09:19:33 +08:00 committed by Greg Kroah-Hartman
parent 451b9495fe
commit d6c6216a7e
1 changed files with 3 additions and 0 deletions
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3
tools/lib/bpf/btf_dump.c
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@ -193,6 +193,9 @@ 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->key);