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ie: Fix up broken Access Point with too many rates added

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According to the specification, Supported rates IE is supposed
to have a maximum length of eight rate bytes. In the wild an
Access Point is found to add 12 bytes of data instead of placing
excess rate bytes in an Extended Rates IE.

BSS: len 480
    BSSID 44:39:C4:XX:XX:XX
    Probe Response: true
    TSF: 0 (0x0000000000000000)
    IEs: len 188
...
        Supported rates:
            1.0(B) 2.0(B) 5.5(B) 6.0(B) 9.0 11.0(B) 12.0(B) 18.0 Mbit/s
            24.0(B) 36.0 48.0 54.0 Mbit/s
            82 84 8b 8c 12 96 98 24 b0 48 60 6c              .......$.H`l
        DSSS parameter set: channel 3
            03
...

Any following IEs decode nicely, thus it seems that we can relax
Supported Rates IE length handling to support this thermostat.
This commit is contained in:
Patrik Flykt 2018-11-05 10:13:26 -07:00 committed by Denis Kenzior
parent c68ae2f00b
commit 7ec8fd6776
1 changed files with 1 additions and 2 deletions
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3
src/ie.c
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@ -1371,8 +1371,7 @@ int ie_parse_supported_rates(struct ie_tlv_iter *iter,
len = ie_tlv_iter_get_length(iter);
if (ie_tlv_iter_get_tag(iter) == IE_TYPE_SUPPORTED_RATES &&
(len == 0 || len > 8))
if (ie_tlv_iter_get_tag(iter) == IE_TYPE_SUPPORTED_RATES && len == 0)
return -EINVAL;
rates = ie_tlv_iter_get_data(iter);