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Fix segfault when closing datatype during failure in H5Topen2 #4683

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merged 1 commit into from
Aug 2, 2024
Merged

Fix segfault when closing datatype during failure in H5Topen2 #4683

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38 changes: 37 additions & 1 deletion src/H5Tcommit.c
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Original file line number Diff line number Diff line change
Expand Up @@ -59,6 +59,7 @@ static herr_t H5T__commit_api_common(hid_t loc_id, const char *name, hid_t type_
static hid_t H5T__open_api_common(hid_t loc_id, const char *name, hid_t tapl_id, void **token_ptr,
H5VL_object_t **_vol_obj_ptr);
static H5T_t *H5T__open_oid(const H5G_loc_t *loc);
static herr_t H5T_destruct_datatype(void *datatype, H5VL_t *vol_connector);

/*********************/
/* Public Variables */
Expand Down Expand Up @@ -662,7 +663,7 @@ H5T__open_api_common(hid_t loc_id, const char *name, hid_t tapl_id, void **token
done:
/* Cleanup on error */
if (H5I_INVALID_HID == ret_value)
if (dt && H5VL_datatype_close(*vol_obj_ptr, H5P_DATASET_XFER_DEFAULT, H5_REQUEST_NULL) < 0)
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This VOL object pointer actually points to the VOL object that was passed in to H5Topen2 for loc_id rather than pointing to the VOL object for the committed datatype. When H5VL_register above fails, dt is left as a typeless pointer not attached to a VOL object, so we have to wrap it in one before being able to call H5VL_datatype_close on it.

if (dt && H5T_destruct_datatype(dt, (*vol_obj_ptr)->connector) < 0)
HDONE_ERROR(H5E_DATATYPE, H5E_CLOSEERROR, H5I_INVALID_HID, "unable to release datatype");

FUNC_LEAVE_NOAPI(ret_value)
Expand Down Expand Up @@ -1260,6 +1261,41 @@ H5T_construct_datatype(H5VL_object_t *vol_obj)
FUNC_LEAVE_NOAPI(ret_value)
} /* end H5T_construct_datatype() */

/*-------------------------------------------------------------------------
* Function: H5T_destruct_datatype
*
* Purpose: Helper function to free a committed datatype object that
* hasn't yet been wrapped within a VOL object. This usually
* happens when a failure occurs during opening a committed
* datatype. When this happens, the datatype must be wrapped
* inside a temporary VOL object in order to route the close
* operation through the stack of VOL connectors.
*
* Return: Non-negative on success/Negative on failure
*
*-------------------------------------------------------------------------
*/
static herr_t
H5T_destruct_datatype(void *datatype, H5VL_t *vol_connector)
{
H5VL_object_t *vol_obj = NULL;
herr_t ret_value = FAIL;

FUNC_ENTER_NOAPI(FAIL)

if (NULL == (vol_obj = H5VL_create_object(datatype, vol_connector)))
HGOTO_ERROR(H5E_DATATYPE, H5E_CANTALLOC, FAIL, "can't create VOL object for committed datatype");

if (H5VL_datatype_close(vol_obj, H5P_DATASET_XFER_DEFAULT, H5_REQUEST_NULL) < 0)
HGOTO_ERROR(H5E_DATATYPE, H5E_CLOSEERROR, FAIL, "unable to release datatype");

done:
if (vol_obj && H5VL_free_object(vol_obj) < 0)
HDONE_ERROR(H5E_DATATYPE, H5E_CANTFREE, FAIL, "can't free VOL object");

FUNC_LEAVE_NOAPI(ret_value)
} /* end H5T_destruct_datatype() */

/*-------------------------------------------------------------------------
* Function: H5T_get_named_type
*
Expand Down
8 changes: 7 additions & 1 deletion src/H5VLint.c
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Original file line number Diff line number Diff line change
Expand Up @@ -578,6 +578,12 @@ H5VL__new_vol_obj(H5I_type_t type, void *object, H5VL_t *vol_connector, bool wra
if (NULL == ret_value) {
if (conn_rc_incr && H5VL_conn_dec_rc(vol_connector) < 0)
HDONE_ERROR(H5E_VOL, H5E_CANTDEC, NULL, "unable to decrement ref count on VOL connector");

if (new_vol_obj) {
if (wrap_obj && new_vol_obj->data)
(void)H5VL_object_unwrap(new_vol_obj);
(void)H5FL_FREE(H5VL_object_t, new_vol_obj);
}
} /* end if */

FUNC_LEAVE_NOAPI(ret_value)
Expand Down Expand Up @@ -698,7 +704,7 @@ H5VL_register(H5I_type_t type, void *object, H5VL_t *vol_connector, bool app_ref
/* Set up VOL object for the passed-in data */
/* (Does not wrap object, since it's from a VOL callback) */
if (NULL == (vol_obj = H5VL__new_vol_obj(type, object, vol_connector, false)))
HGOTO_ERROR(H5E_VOL, H5E_CANTCREATE, FAIL, "can't create VOL object");
HGOTO_ERROR(H5E_VOL, H5E_CANTCREATE, H5I_INVALID_HID, "can't create VOL object");

/* Register VOL object as _object_ type, for future object API calls */
if ((ret_value = H5I_register(type, vol_obj, app_ref)) < 0)
Expand Down
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