[HADOOP-9439] JniBasedUnixGroupsMapping: fix some crash bugs

• Type: Bug
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 2.0.4-alpha
• Fix Version/s: 2.1.0-beta
• Component/s: native
• Assignee: Colin McCabe
• Reporter: Colin McCabe
• Created: 26/Mar/13 22:53
• Updated: 03/Sep/14 22:47
• Resolved: 24/Jun/13 16:33

Description

JniBasedUnixGroupsMapping has some issues.

• sometimes on error paths variables are freed prior to being initialized
• re-allocate buffers less frequently (can reuse the same buffer for multiple calls to getgrnam)
• allow non-reentrant functions to be used, to work around client bugs
• don't throw IOException from JNI functions if the JNI functions do not declare this checked exception.
• don't bail out if only one group name among all the ones associated with a user can't be looked up.

Issue Links

• is related to: HADOOP-9312 JniBasedUnixGroupsMapping#getGroupForUser can potentially leak memory