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QL code and tests for C#/C++/JavaScript.

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Pavel Avgustinov
2018-08-02 17:53:23 +01:00
commit b55526aa58
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cpp/ql/src/Critical/InconsistentNullnessTesting.qhelp Normal file
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<!DOCTYPE qhelp PUBLIC
"-//Semmle//qhelp//EN"
"qhelp.dtd">
<qhelp>
<overview>
<p>This rule finds pointer dereferences that do not check the pointer for nullness, while the same pointer is checked for nullness in other
places in the code. It is most likely that the nullness check was omitted, and that a NULL pointer dereference can occur.
Dereferencing a null pointer and attempting to modify its contents can lead to anything from a segfault to corrupting
important system data (i.e. the interrupt table in some architectures).
</p>
<include src="pointsToWarning.qhelp" />
</overview>
<recommendation>
<p>Make the nullness check on the pointer consistent across all dereferences.</p>
</recommendation>
<example><sample src="InconsistentNullnessTesting.cpp" />
</example>
</qhelp>