RFR: 8332589: ubsan: unix/native/libjava/ProcessImpl_md.c:562:5: runtime error: null pointer passed as argument 2, which is declared to never be null [v2]

[Matthias Baesken]

> When building with ubsan enabled (--enable-uban) on Linux x86_64 and doing jtreg tests afterwards I run into this error :
> 
> /jdk/src/java.base/unix/native/libjava/ProcessImpl_md.c:562:5: runtime error: null pointer passed as argument 2, which is declared to never be null
>     #0 0x7fd95bec78d8 in spawnChild /jdk/src/java.base/unix/native/libjava/ProcessImpl_md.c:562
>     #1 0x7fd95bec78d8 in startChild /jdk/src/java.base/unix/native/libjava/ProcessImpl_md.c:612
>     #2 0x7fd95bec78d8 in Java_java_lang_ProcessImpl_forkAndExec /jdk/src/java.base/unix/native/libjava/ProcessImpl_md.c:712
>     #3 0x7fd93797a06d (<unknown module>)
> 
> this is the memcpy call getting an unexpected null pointer :
>     memcpy(buf+offset, c->pdir, sp.dirlen); gets a second parameter null.
> Something similar was discussed and fixed here https://bugs.python.org/issue27570 for Python .
> 
> Similar issue in OpenJDK _ 
> https://bugs.openjdk.org/browse/JDK-8332473
> 8332473: ubsan: growableArray.hpp:290:10: runtime error: null pointer passed as argument 1, which is declared to never be null

Matthias Baesken has updated the pull request incrementally with one additional commit since the last revision:

  remarks Roger Riggs

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/19329/files
  - new: https://git.openjdk.org/jdk/pull/19329/files/f2bebda2..b03ff0c5

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=19329&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=19329&range=00-01

  Stats: 3 lines in 1 file changed: 1 ins; 1 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/19329.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/19329/head:pull/19329

PR: https://git.openjdk.org/jdk/pull/19329