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band: check the operating class band before checking e4
After the band is established we check the e4 table for the channel that matches. The problem here is we will end up checking all the operating classes, even those that are not within the band that was determined. This could result in false positives and return a channel that doesn't make sense.
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@ -1352,6 +1352,10 @@ check_e4:
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const struct operating_class_info *info =
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&e4_operating_classes[i];
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if (band != band_oper_class_to_band(NULL,
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info->operating_class))
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continue;
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if (e4_has_frequency(info, freq) == 0 ||
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e4_has_ccfi(info, freq) == 0) {
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if (out_band)
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