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Fix panic on malformed Dot11 InformationElement packets #1232

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Fix panic on malformed Dot11 InformationElement packets #1232

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8 changes: 4 additions & 4 deletions layers/dot11.go
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Original file line number Diff line number Diff line change
Expand Up @@ -1470,12 +1470,12 @@ func (m *Dot11InformationElement) DecodeFromBytes(data []byte, df gopacket.Decod
df.SetTruncated()
return fmt.Errorf("Dot11InformationElement length %v too short, %v required", len(data), offset+int(m.Length))
}
if len(data) < offset+4 {
df.SetTruncated()
return fmt.Errorf("vendor extension size < %d", offset+int(m.Length))
}
if m.ID == 221 {
// Vendor extension
if int(m.Length) < 4 {
df.SetTruncated()
return fmt.Errorf("Dot11InformationElement vendor IE length %d too short, 4 required", m.Length)
}
m.OUI = data[offset : offset+4]
m.Info = data[offset+4 : offset+int(m.Length)]
} else {
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