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| author | Eric Auger <eric.auger@redhat.com> | 2023-02-28 10:29:44 +0100 |
|---|---|---|
| committer | Michael Tokarev <mjt@tls.msk.ru> | 2024-03-01 22:06:10 +0300 |
| commit | 73bf928177b6e3c894de9fe3796161219a4e1412 (patch) | |
| tree | a9fcd2d20b2ac9a50611e35b8f5aa0ee4abaded4 | |
| parent | 72e2a246385c0162df948824f1cc19e0b37548e9 (diff) | |
test-vmstate: fix bad GTree usage, use-after-free
According to g_tree_foreach() documentation:
"The tree may not be modified while iterating over it (you can't
add/remove items)."
compare_trees()/diff_tree() fail to respect this rule.
Historically GLib2 used a slice allocator for the GTree APIs
which did not immediately release the memory back to the system
allocator. As a result QEMU's use-after-free bug was not visible.
With GLib > 2.75.3 however, GLib2 has switched to using malloc
and now a SIGSEGV can be observed while running test-vmstate.
Get rid of the node removal within the tree traversal. Also
check the trees have the same number of nodes before the actual
diff.
Fixes: 9a85e4b8f6 ("migration: Support gtree migration")
Resolves: https://gitlab.com/qemu-project/qemu/-/issues/1518
Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Signed-off-by: Eric Auger <eric.auger@redhat.com>
Reported-by: Richard W.M. Jones <rjones@redhat.com>
Tested-by: Richard W.M. Jones <rjones@redhat.com>
Reviewed-by: Richard W.M. Jones <rjones@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
(cherry picked from commit abe2c4bdb65e8dd9cb2f01c355baa394bf49a8af)
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
| -rw-r--r-- | tests/unit/test-vmstate.c | 5 |
1 files changed, 2 insertions, 3 deletions
diff --git a/tests/unit/test-vmstate.c b/tests/unit/test-vmstate.c index 541bb4f63e..aae32bbf91 100644 --- a/tests/unit/test-vmstate.c +++ b/tests/unit/test-vmstate.c @@ -1074,7 +1074,6 @@ static gboolean diff_tree(gpointer key, gpointer value, gpointer data) struct match_node_data d = {tp->tree2, key, value}; g_tree_foreach(tp->tree2, tp->match_node, &d); - g_tree_remove(tp->tree1, key); return false; } @@ -1083,9 +1082,9 @@ static void compare_trees(GTree *tree1, GTree *tree2, { struct tree_cmp_data tp = {tree1, tree2, function}; + assert(g_tree_nnodes(tree1) == g_tree_nnodes(tree2)); g_tree_foreach(tree1, diff_tree, &tp); - assert(g_tree_nnodes(tree1) == 0); - assert(g_tree_nnodes(tree2) == 0); + g_tree_destroy(g_tree_ref(tree1)); } static void diff_domain(TestGTreeDomain *d1, TestGTreeDomain *d2) |