libbpf: don't close(-1) in multi-uprobe feature detector
Guard close(link_fd) with extra link_fd >= 0 check to prevent close(-1).
Detected by Coverity static analysis.
Fixes: 04d939a2ab
("libbpf: detect broken PID filtering logic for multi-uprobe")
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Link: https://lore.kernel.org/r/20240529231212.768828-1-andrii@kernel.org
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
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@ -393,7 +393,8 @@ static int probe_uprobe_multi_link(int token_fd)
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err = -errno; /* close() can clobber errno */
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if (link_fd >= 0 || err != -EBADF) {
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close(link_fd);
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if (link_fd >= 0)
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close(link_fd);
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close(prog_fd);
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return 0;
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}
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