vchoi-hdfgroup b23affc2a6 Fix for github issue #3790: infinite loop closing library (#4445) ...

* Fix for github issue #3790: infinite loop closing library
Cause of the problem:
When h5dump tries to open the user provided test file, the metadata cache will
call the "get_final_load_size" callback to find out the actual size of the
the root object header.  The callback function will call
H5O__prefix_deserialize() to allocate space for the object header
data structure (via H5FL_CALLOC) and to deserialize the object header prefix
in order to find the actual size of the object header.
The metadata cache will then check whether the actual size obtained
will exceed the file's EOA.
Since the actual size obtained from the test file exceeds the EOA,
the metadata cache throws an error and return.
However, the oh structure that was allocated in H5O__prefix_deserialize()
was not freed and hence causing the problem described in this issue.
Fix:
1) Deallocate the oh structure after obtaining and saving the needed
information in udata which will be used later on in the "verify_chksum" callback.
2) Deserialize the object header prefix in the "object header's
"deserialize" callback regardless.  The original coding intends to keep the
deserialized prefix so that the object header's "deserialize" callback
does not need to deserialize the prefix again if the object header is coming
through the "get_final_load_size" callback.

2024-04-30 07:21:08 -05:00

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