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libbpf: Fix null pointer dereference in btf_dump__free on allocation failure #5475

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libbpf: Fix null pointer dereference in btf_dump__free on allocation failure #5475

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Pull request for series with
subject: libbpf: Fix null pointer dereference in btf_dump__free on allocation failure
version: 1
url: https://patchwork.kernel.org/project/netdevbpf/list/?series=972865

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Upstream branch: f66b4aa
series: https://patchwork.kernel.org/project/netdevbpf/list/?series=972865
version: 1

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Upstream branch: a633dab
series: https://patchwork.kernel.org/project/netdevbpf/list/?series=972865
version: 1

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Upstream branch: 66ab68c
series: https://patchwork.kernel.org/project/netdevbpf/list/?series=972865
version: 1

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At least one diff in series https://patchwork.kernel.org/project/netdevbpf/list/?series=972865 expired. Closing PR.

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Upstream branch: bd07bd1
series: https://patchwork.kernel.org/project/netdevbpf/list/?series=973172
version: 2

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Upstream branch: cd7312a
series: https://patchwork.kernel.org/project/netdevbpf/list/?series=973172
version: 2

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Upstream branch: e30329b
series: https://patchwork.kernel.org/project/netdevbpf/list/?series=973172
version: 2

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Upstream branch: 99fe8af
series: https://patchwork.kernel.org/project/netdevbpf/list/?series=973172
version: 2

@chenyuan0001
libbpf: Fix null pointer dereference in btf_dump__free on allocation …
4d808c5 
…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.

Fix: 351131b ("libbpf: add btf_dump API for BTF-to-C conversion")
Signed-off-by: chenyuan <[email protected]>
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