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Posted to hdfs-dev@hadoop.apache.org by "Colin Patrick McCabe (JIRA)" <ji...@apache.org> on 2012/10/31 23:51:12 UTC
[jira] [Created] (HDFS-4132) when libwebhdfs is not enabled,
nativeMiniDfsClient frees uninitialized memory
Colin Patrick McCabe created HDFS-4132:
------------------------------------------
Summary: when libwebhdfs is not enabled, nativeMiniDfsClient frees uninitialized memory
Key: HDFS-4132
URL: https://issues.apache.org/jira/browse/HDFS-4132
Project: Hadoop HDFS
Issue Type: Bug
Components: libhdfs
Affects Versions: 2.0.3-alpha
Reporter: Colin Patrick McCabe
Assignee: Colin Patrick McCabe
When libwebhdfs is not enabled, nativeMiniDfsClient frees uninitialized memory.
Details: jconfStr is declared uninitialized...
{code}
struct NativeMiniDfsCluster* nmdCreate(struct NativeMiniDfsConf *conf)
{
struct NativeMiniDfsCluster* cl = NULL;
jobject bld = NULL, bld2 = NULL, cobj = NULL;
jvalue val;
JNIEnv *env = getJNIEnv();
jthrowable jthr;
jstring jconfStr;
{code}
and only initialized later if conf->webhdfsEnabled:
{code}
...
if (conf->webhdfsEnabled) {
jthr = newJavaStr(env, DFS_WEBHDFS_ENABLED_KEY, &jconfStr);
if (jthr) {
printExceptionAndFree(env, jthr, PRINT_EXC_ALL,
...
{code}
Then we try to free this uninitialized memory at the end, usually resulting in a crash.
{code}
(*env)->DeleteLocalRef(env, jconfStr);
return cl;
{code}
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