In some cases an input visitor might bail out on filling out a struct for various reasons, such as missing fields when running in strict mode. In the case of a QAPI Union type, this may lead to cases where the .kind field which encodes the union type is uninitialized. Subsequently, other visitors, such as the dealloc visitor, may use this .kind value as if it were initialized, leading to assumptions about the union type which in this case may lead to segfaults. For example, freeing an integer value. However, we can generally rely on the fact that the always-present .data void * field that we generate for these union types will always be NULL in cases where .kind is uninitialized (at least, there shouldn't be a reason where we'd do this purposefully). So pass this information on to Visitor implementation via these optional start_union/end_union interfaces so this information can be used to guard against the situation above. We will make use of this information in a subsequent patch for the dealloc visitor. Cc: qemu-stable@nongnu.org Reported-by: Fam Zheng <famz@redhat.com> Suggested-by: Paolo Bonzini <pbonzini@redhat.com> Reviewed-by: Paolo Bonzini <pbonzini@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com> Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>
68 lines
2.9 KiB
C
68 lines
2.9 KiB
C
/*
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* Core Definitions for QAPI Visitor implementations
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*
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* Copyright (C) 2012 Red Hat, Inc.
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*
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* Author: Paolo Bonizni <pbonzini@redhat.com>
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*
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* This work is licensed under the terms of the GNU LGPL, version 2.1 or later.
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* See the COPYING.LIB file in the top-level directory.
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*
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*/
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#ifndef QAPI_VISITOR_IMPL_H
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#define QAPI_VISITOR_IMPL_H
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#include "qapi/error.h"
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#include "qapi/visitor.h"
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struct Visitor
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{
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/* Must be set */
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void (*start_struct)(Visitor *v, void **obj, const char *kind,
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const char *name, size_t size, Error **errp);
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void (*end_struct)(Visitor *v, Error **errp);
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void (*start_implicit_struct)(Visitor *v, void **obj, size_t size,
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Error **errp);
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void (*end_implicit_struct)(Visitor *v, Error **errp);
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void (*start_list)(Visitor *v, const char *name, Error **errp);
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GenericList *(*next_list)(Visitor *v, GenericList **list, Error **errp);
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void (*end_list)(Visitor *v, Error **errp);
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void (*type_enum)(Visitor *v, int *obj, const char *strings[],
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const char *kind, const char *name, Error **errp);
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void (*get_next_type)(Visitor *v, int *kind, const int *qobjects,
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const char *name, Error **errp);
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void (*type_int)(Visitor *v, int64_t *obj, const char *name, Error **errp);
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void (*type_bool)(Visitor *v, bool *obj, const char *name, Error **errp);
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void (*type_str)(Visitor *v, char **obj, const char *name, Error **errp);
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void (*type_number)(Visitor *v, double *obj, const char *name,
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Error **errp);
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/* May be NULL */
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void (*optional)(Visitor *v, bool *present, const char *name,
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Error **errp);
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void (*type_uint8)(Visitor *v, uint8_t *obj, const char *name, Error **errp);
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void (*type_uint16)(Visitor *v, uint16_t *obj, const char *name, Error **errp);
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void (*type_uint32)(Visitor *v, uint32_t *obj, const char *name, Error **errp);
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void (*type_uint64)(Visitor *v, uint64_t *obj, const char *name, Error **errp);
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void (*type_int8)(Visitor *v, int8_t *obj, const char *name, Error **errp);
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void (*type_int16)(Visitor *v, int16_t *obj, const char *name, Error **errp);
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void (*type_int32)(Visitor *v, int32_t *obj, const char *name, Error **errp);
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void (*type_int64)(Visitor *v, int64_t *obj, const char *name, Error **errp);
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/* visit_type_size() falls back to (*type_uint64)() if type_size is unset */
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void (*type_size)(Visitor *v, uint64_t *obj, const char *name, Error **errp);
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bool (*start_union)(Visitor *v, bool data_present, Error **errp);
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void (*end_union)(Visitor *v, bool data_present, Error **errp);
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};
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void input_type_enum(Visitor *v, int *obj, const char *strings[],
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const char *kind, const char *name, Error **errp);
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void output_type_enum(Visitor *v, int *obj, const char *strings[],
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const char *kind, const char *name, Error **errp);
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#endif
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