[PATCH] D70596: [analyzer][docs] NFC: Extend documentation for MallocOverflow checker

[Balázs Benics via Phabricator via cfe-commits]

steakhal created this revision.
steakhal added reviewers: Szelethus, NoQ, krememek.
Herald added subscribers: cfe-commits, Charusso, donat.nagy, dexonsmith, mikhail.ramalho, a.sidorin, szepet, baloghadamsoftware, xazax.hun, whisperity.
Herald added a project: clang.

Adds and example for `MallocOverflow` checker how to suppress the warning via checking the upper bound of the allocation size.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D70596

Files:
  clang/docs/analyzer/checkers.rst


Index: clang/docs/analyzer/checkers.rst
===================================================================
--- clang/docs/analyzer/checkers.rst
+++ clang/docs/analyzer/checkers.rst
@@ -1974,6 +1974,12 @@
    void *p = malloc(n * sizeof(int)); // warn
  }
 
+ void test2(int n) {
+   if (n > 100) // gives an upper-bound
+     return;
+   void *p = malloc(n * sizeof(int)); // no warning
+ }
+
 .. _alpha-security-MmapWriteExec:
 
 alpha.security.MmapWriteExec (C)


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