mirror of
https://github.com/github/codeql.git
synced 2026-07-22 03:32:03 +02:00
28 lines
795 B
XML
28 lines
795 B
XML
<!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>
|