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[ARGUS] Fix: ERROR runtime error: invalid memory address or nil pointer dereference gorout... #9

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[ARGUS] Fix: ERROR runtime error: invalid memory address or nil pointer dereference gorout... #9

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11 changes: 6 additions & 5 deletions helloserver/server.go
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Original file line number Diff line number Diff line change
Expand Up @@ -82,10 +82,11 @@ var users = map[string]string{

func userInfo(w http.ResponseWriter, r *http.Request) {
username := r.URL.Query().Get("name")
displayName := users[username]
displayName, ok := users[username]
if !ok {
http.Error(w, "User not found", http.StatusNotFound)
return
}

// Bug: displayName is "" for unknown users, but we dereference
// a nil *http.Request later by shadowing r.
var detail *http.Request
fmt.Fprintf(w, "User: %s, Host: %s\n", displayName, detail.Host)
fmt.Fprintf(w, "User: %s, Host: %s\n", displayName, r.Host)
}