Adding some missing Null Checks. #1
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Added to avoid possible Null Pointer dereference.
In case if condition ad line 776 is false, value of errp_arg will be NULL which is dereference in call v_execute_function (S_name, u_variable, erpp_arg); at line 802. this causes crash.
sprintf can cause buffer overflow problem as it does not check length of src. snprintf takes only given no of bytes and hence avoids buffer overflow problem.
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Added to avoid possible Null Pointer dereference.