https://llvm.org/bugs/show_bug.cgi?id=25701
Bug ID: 25701
Summary: False positive: memory leak reported for cast to union
Product: clang
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: Static Analyzer
Assignee: kreme...@apple.com
Reporter: war...@icouldbedeadwrong.net
CC: llvm-bugs@lists.llvm.org
Classification: Unclassified
Created attachment 15378
--> https://llvm.org/bugs/attachment.cgi?id=15378&action=edit
Test case
Platform: Ubuntu 14.04.2 LTS
Tool version (svn info):
URL: http://llvm.org/svn/llvm-project/cfe/trunk/tools/scan-build
Relative URL: ^/cfe/trunk/tools/scan-build
Repository Root: http://llvm.org/svn/llvm-project
Repository UUID: 91177308-0d34-0410-b5e6-96231b3b80d8
Revision: 254388
I have written a small test case (see attachment) - this code compiles and
passes through valgrind without issue. However, scan-build complains about a
possible memory leak, as follows:
/opt/llvm/libexec/ccc-analyzer -o union -g -Wall -Wextra union.c
union.c:25:5: warning: Potential leak of memory pointed to by 'ret'
return (request_un)ret;
^~~~~~~~~~~~~~~~~~~~~~
1 warning generated.
(Note that the memory in question is freed on line 42).
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