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Risk Assessment
Setting pointers to null NULL after memory has been freed is a simple and easily implemented solution for reducing dangling pointers. Dangling pointers can result in freeing memory multiple times or in writing to memory that has already been freed. Both of these problems can lead to an attacker executing arbitrary code with the permissions of the vulnerable process.
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Search for vulnerabilities resulting from the violation of this rule on the CERT website.
References
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\[[ISO/IEC 9899-1999|AA. C References#ISO/IEC 9899-1999]\] Section 7.20.3.2, "The free function" \[[Seacord 05|AA. C References#Seacord 05]\] Chapter 4, "Dynamic Memory Management" \[[Plakosh 05|AA. C References#Plakosh 05]\] |