Lennart Poettering
524ea5852a
The overflow check was hosed in two ways: overflows in C are undefined, hence gcc was free to just optimize the whole thing away. We need to catch overflows before we run into them, not after. It checked for an overflow against size_t, but the field we need to write this in is unsigned. i.e. typically 32bit rather than 64bit. Hence check for the right maximum. (The whole check is paranoia anyway, the kernel really shouldn't return values that would induce an overflow, but you never know, the syscall turned out to be problematic in so many other ways, hence let's stick to this.)
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