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fix null pointer deref
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@ -2804,12 +2804,12 @@ MYSQLND_METHOD(mysqlnd_conn_data, tx_begin)(MYSQLND_CONN_DATA * conn, const unsi
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smart_str_free(&tmp_str);
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break;
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} else if (mode & TRANS_START_READ_WRITE) {
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if (tmp_str.s->len) {
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if (tmp_str.s && tmp_str.s->len) {
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smart_str_appendl(&tmp_str, ", ", sizeof(", ") - 1);
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}
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smart_str_appendl(&tmp_str, "READ WRITE", sizeof("READ WRITE") - 1);
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} else if (mode & TRANS_START_READ_ONLY) {
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if (tmp_str.s->len) {
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if (tmp_str.s && tmp_str.s->len) {
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smart_str_appendl(&tmp_str, ", ", sizeof(", ") - 1);
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}
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smart_str_appendl(&tmp_str, "READ ONLY", sizeof("READ ONLY") - 1);
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