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Do not dereference NULL environment variable value, GitHub issue 2304.
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@ -1432,7 +1432,7 @@ yylex_token_variable(char **buf, size_t *len)
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name[namelen] = '\0';
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envent = environ_find(global_environ, name);
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if (envent != NULL) {
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if (envent != NULL && envent->value != NULL) {
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value = envent->value;
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log_debug("%s: %s -> %s", __func__, name, value);
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yylex_append(buf, len, value, strlen(value));
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