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In this example, the memory referred to by x may be freed twice: once if error_condition is true and again at the end of the code.
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size_t number; int error_condition = 0; /* initialize number */ int *x = (int *)malloc (number * sizeof(int)); if (x == NULL) { /* Handle Allocation Error */ } /* ... */ if (error_condition == 1) { /* Handle Error Condition*/ free(x); } /* ... */ free(x); |
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Only free a pointer to dynamic memory referred to by x once. This is accomplished by removing the call to free() in the section of code executed when error_condition is true.
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size_t number; int error_condition = 0; /* initialize number */ if (number > SIZE_MAX/sizeof(int)) { /* handle overflow */ } int *x = (int *)malloc(number * sizeof(int)); if (x == NULL) { /* Handle Allocation Error */ } /* ... */ if (error_condition == 1) { /* Handle Error Condition*/ } /* ... */ free(x); x = NULL; |
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