2fa4861ad5a203bff604cac660136834e3b70108
Coverity was complaining about TOCTOU (CID #745806). Indeed, it seems better to open the file and avoid the stat altogether: - O_NOFOLLOW means we'll get ELOOP, which we can translate to EINVAL as before, - similarly, open(O_WRONLY) on a directory will fail with EISDIR, - and finally, it makes no sense to check access mode ourselves: just let the kernel do it and propagate the error. v2: - fix memleak, don't clober input arg
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