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

[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

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Commit messages:
 - JDK-8332589

Changes: https://git.openjdk.org/jdk/pull/19329/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=19329&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8332589
  Stats: 4 lines in 1 file changed: 2 ins; 0 del; 2 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