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dangling pointer

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For example, a phone number for a person who has since changed phones is a real-world example of a dangling pointer. en.wikipedia.org

A variable whose extent ends before its scope may become a dangling pointer and deemed uninitialized once more since its value has been destroyed. en.wikipedia.org

In systems with explicit memory allocation, it is possible to create a dangling pointer by deallocating the memory region it points into. en.wikipedia.org

When a dangling pointer is used after it has been freed without allocating a new chunk of memory to it, this becomes known as a use after free vulnerability. en.wikipedia.org

This approach completely eliminates dangling pointer errors by disabling frees, and reclaiming objects by garbage collection. en.wikipedia.org

However, as variables are not destroyed until they go out of context, the analog of a dangling pointer does not exist. en.wikipedia.org

Attempting to use a dangling pointer typically results in program failure. en.wikipedia.org

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