diff options
| author | Andrey Shinkevich <andrey.shinkevich@virtuozzo.com> | 2019-08-05 20:03:06 +0300 |
|---|---|---|
| committer | Markus Armbruster <armbru@redhat.com> | 2019-09-24 11:03:44 +0200 |
| commit | 863f195fa823c0c20d734dadfc5908c2aea34330 (patch) | |
| tree | 78c27869d1e0d19c7a7ec9cdf5079848855873f9 /qapi/opts-visitor.c | |
| parent | 81b49004e0846b3526e26c786b6f64d4f1a0e38a (diff) | |
make check-unit: use after free in test-opts-visitor
In the struct OptsVisitor, the 'repeated_opts' member points to a list
in the 'unprocessed_opts' hash table after the list has been destroyed.
A subsequent call to visit_type_int() references the deleted list.
It results in use-after-free issue reproduced by running the test case
under the Valgrind: valgrind tests/test-opts-visitor.
A new mode ListMode::LM_TRAVERSED is declared to mark the list
traversal completed.
Suggested-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Andrey Shinkevich <andrey.shinkevich@virtuozzo.com>
Message-Id: <1565024586-387112-1-git-send-email-andrey.shinkevich@virtuozzo.com>
Diffstat (limited to 'qapi/opts-visitor.c')
| -rw-r--r-- | qapi/opts-visitor.c | 26 |
1 files changed, 22 insertions, 4 deletions
diff --git a/qapi/opts-visitor.c b/qapi/opts-visitor.c index 324b197495..5fe0276c1c 100644 --- a/qapi/opts-visitor.c +++ b/qapi/opts-visitor.c @@ -24,7 +24,8 @@ enum ListMode { LM_NONE, /* not traversing a list of repeated options */ - LM_IN_PROGRESS, /* opts_next_list() ready to be called. + LM_IN_PROGRESS, /* + * opts_next_list() ready to be called. * * Generating the next list link will consume the most * recently parsed QemuOpt instance of the repeated @@ -36,7 +37,8 @@ enum ListMode * LM_UNSIGNED_INTERVAL. */ - LM_SIGNED_INTERVAL, /* opts_next_list() has been called. + LM_SIGNED_INTERVAL, /* + * opts_next_list() has been called. * * Generating the next list link will consume the most * recently stored element from the signed interval, @@ -48,7 +50,14 @@ enum ListMode * next element of the signed interval. */ - LM_UNSIGNED_INTERVAL /* Same as above, only for an unsigned interval. */ + LM_UNSIGNED_INTERVAL, /* Same as above, only for an unsigned interval. */ + + LM_TRAVERSED /* + * opts_next_list() has been called. + * + * No more QemuOpt instance in the list. + * The traversal has been completed. + */ }; typedef enum ListMode ListMode; @@ -238,6 +247,8 @@ opts_next_list(Visitor *v, GenericList *tail, size_t size) OptsVisitor *ov = to_ov(v); switch (ov->list_mode) { + case LM_TRAVERSED: + return NULL; case LM_SIGNED_INTERVAL: case LM_UNSIGNED_INTERVAL: if (ov->list_mode == LM_SIGNED_INTERVAL) { @@ -258,6 +269,8 @@ opts_next_list(Visitor *v, GenericList *tail, size_t size) opt = g_queue_pop_head(ov->repeated_opts); if (g_queue_is_empty(ov->repeated_opts)) { g_hash_table_remove(ov->unprocessed_opts, opt->name); + ov->repeated_opts = NULL; + ov->list_mode = LM_TRAVERSED; return NULL; } break; @@ -289,7 +302,8 @@ opts_end_list(Visitor *v, void **obj) assert(ov->list_mode == LM_IN_PROGRESS || ov->list_mode == LM_SIGNED_INTERVAL || - ov->list_mode == LM_UNSIGNED_INTERVAL); + ov->list_mode == LM_UNSIGNED_INTERVAL || + ov->list_mode == LM_TRAVERSED); ov->repeated_opts = NULL; ov->list_mode = LM_NONE; } @@ -306,6 +320,10 @@ lookup_scalar(const OptsVisitor *ov, const char *name, Error **errp) list = lookup_distinct(ov, name, errp); return list ? g_queue_peek_tail(list) : NULL; } + if (ov->list_mode == LM_TRAVERSED) { + error_setg(errp, "Fewer list elements than expected"); + return NULL; + } assert(ov->list_mode == LM_IN_PROGRESS); return g_queue_peek_head(ov->repeated_opts); } |