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libbpf: Potential NULL dereference in usdt_manager_attach_usdt()

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link could be null but still dereference bpf_link__destroy(&link->link)
and it will lead to a null pointer access.

Signed-off-by: Haowen Bai <baihaowen@meizu.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/1649299098-2069-1-git-send-email-baihaowen@meizu.com
This commit is contained in:
Haowen Bai
2022-04-07 10:38:17 +08:00
committed by Andrii Nakryiko
parent 13fe7fedfa
commit 462e3f600a
1 changed files with 2 additions and 2 deletions
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4
src/usdt.c
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@@ -1071,8 +1071,8 @@ struct bpf_link *usdt_manager_attach_usdt(struct usdt_manager *man, const struct
return &link->link; return &link->link;
err_out: err_out:
bpf_link__destroy(&link->link); if (link)
bpf_link__destroy(&link->link);
free(targets); free(targets);
hashmap__free(specs_hash); hashmap__free(specs_hash);
if (elf) if (elf)