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8263893: getPrinterNames() leaks nameArray if Java String allocation fails #3096

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@aivanov-jdk aivanov-jdk commented Mar 19, 2021

If JNU_NewStringPlatform fails to allocate new Java String object for printer name, std::bad_alloc is thrown. The handler for the exception does not release the local reference to the nameArray, thus it will be leaked.


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  • JDK-8263893: getPrinterNames() leaks nameArray if Java String allocation fails



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bridgekeeper bot commented Mar 19, 2021

👋 Welcome back aivanov! A progress list of the required criteria for merging this PR into master will be added to the body of your pull request. There are additional pull request commands available for use with this pull request.

@openjdk openjdk bot added the rfr label Mar 19, 2021
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openjdk bot commented Mar 19, 2021

@aivanov-jdk The following label will be automatically applied to this pull request:

  • 2d

When this pull request is ready to be reviewed, an "RFR" email will be sent to the corresponding mailing list. If you would like to change these labels, use the /label pull request command.

@openjdk openjdk bot added the 2d label Mar 19, 2021
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mlbridge bot commented Mar 19, 2021


prrace approved these changes Mar 19, 2021
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@prrace prrace left a comment

This is fine but there's not really a leak since when the caller returns to Java localrefs are released anyway.

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openjdk bot commented Mar 19, 2021

@aivanov-jdk This change now passes all automated pre-integration checks.

ℹ️ This project also has non-automated pre-integration requirements. Please see the file for details.

After integration, the commit message for the final commit will be:

8263893: getPrinterNames() leaks nameArray if Java String allocation fails

Reviewed-by: prr, azvegint, kizune

You can use pull request commands such as /summary, /contributor and /issue to adjust it as needed.

At the time when this comment was updated there had been 15 new commits pushed to the master branch:

  • 118a49f: 8263846: Bad JNI lookup getFocusOwner in accessibility code on Mac OS X
  • cb742f9: 8255255: Update Apache Santuario (XML Signature) to version 2.2.1
  • d2c137d: 8263558: Possible NULL dereference in fast path arena free if ZapResourceArea is true
  • ab66d69: 8263138: Initialization of sun.font.SunFontManager.platformFontMap is not thread safe
  • 5b8233b: 8263871: On sem_destroy() failing we should assert
  • 96e5c3f: 8263890: Broken links to
  • 4d9517d: 8263834: Work around gdb for HashtableEntry
  • 6fa6557: 8263825: Remove unused and commented out member from NTLMException
  • 77ebc11: 8263892: More modifier order fixes in java.base
  • 80d3ea0: 8263885: Use the blessed modifier order in java.sql/rowset/transation.xa
  • ... and 5 more:

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@openjdk openjdk bot added the ready label Mar 19, 2021
@@ -175,6 +175,10 @@ static jobjectArray getPrinterNames(JNIEnv *env, DWORD flags) {
} catch (std::bad_alloc&) {
delete [] pPrinterEnum;
if (nameArray != NULL) {
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@mrserb mrserb Mar 19, 2021

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Not sure that we usually clean the local refs in the native JNI methods, that only required in the native loop which are never returned to the java(I have check that by the grep of env->NewObjectArray)

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@aivanov-jdk aivanov-jdk Mar 24, 2021

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You're right. It's not required: all local refs are cleared when the JNI method exits.
My reasoning was that env->DeleteLocalRef(utf_str) is called in the loop. Strictly, it's not required either. Yet if there's a large number of elements in the array, it could cause a problem.

I'm going to withdraw the PR as the fix is not necessary.

@aivanov-jdk aivanov-jdk deleted the JDK-8263893 branch Feb 21, 2022
@openjdk openjdk bot added the client label Feb 21, 2022
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