libbpf: Restore errno after pr_warn.
pr_warn calls into user-provided callback, which can clobber errno, so
`errno = saved_errno` should happen after pr_warn.
Fixes: 0745324562
("libbpf: fix errno is overwritten after being closed.")
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
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@ -544,8 +544,10 @@ static inline int ensure_good_fd(int fd)
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saved_errno = errno;
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close(old_fd);
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errno = saved_errno;
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if (fd < 0)
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if (fd < 0) {
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pr_warn("failed to dup FD %d to FD > 2: %d\n", old_fd, -saved_errno);
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errno = saved_errno;
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}
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}
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return fd;
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}
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