Migration 20240104 patches

[PULL 26/26] migration: fix coverity migrate_mode finding

peterx@redhat.com posted 26 patches 10 months, 3 weeks ago

Download mbox

Maintainers: Stefan Berger <stefanb@linux.vnet.ibm.com>, Gerd Hoffmann <kraxel@redhat.com>, Stefano Stabellini <sstabellini@kernel.org>, Anthony Perard <anthony.perard@citrix.com>, Paul Durrant <paul@xen.org>, Peter Xu <peterx@redhat.com>, Fabiano Rosas <farosas@suse.de>, Paolo Bonzini <pbonzini@redhat.com>, Li Zhijian <lizhijian@fujitsu.com>, Eric Blake <eblake@redhat.com>, Markus Armbruster <armbru@redhat.com>, Richard Henderson <richard.henderson@linaro.org>, Thomas Huth <thuth@redhat.com>, Laurent Vivier <lvivier@redhat.com>

Expand all Fold all

[PULL 26/26] migration: fix coverity migrate_mode finding

Posted by peterx@redhat.com 10 months, 3 weeks ago

From: Steve Sistare <steven.sistare@oracle.com>

Coverity diagnoses a possible out-of-range array index here ...

    static GSList *migration_blockers[MIG_MODE__MAX];

    fill_source_migration_info() {
        GSList *cur_blocker = migration_blockers[migrate_mode()];

... because it does not know that MIG_MODE__MAX will never be returned as
a migration mode.  To fix, assert so in migrate_mode().

Fixes: fa3673e497a1 ("migration: per-mode blockers")

Reported-by: Peter Maydell <peter.maydell@linaro.org>
Suggested-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Steve Sistare <steven.sistare@oracle.com>
Reviewed-by: Fabiano Rosas <farosas@suse.de>
Link: https://lore.kernel.org/r/1699907025-215450-1-git-send-email-steven.sistare@oracle.com
Signed-off-by: Peter Xu <peterx@redhat.com>
---
 migration/options.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/migration/options.c b/migration/options.c
index 8d8ec73ad9..3e3e0b93b4 100644
--- a/migration/options.c
+++ b/migration/options.c
@@ -833,8 +833,10 @@ uint64_t migrate_max_postcopy_bandwidth(void)
 MigMode migrate_mode(void)
 {
     MigrationState *s = migrate_get_current();
+    MigMode mode = s->parameters.mode;
 
-    return s->parameters.mode;
+    assert(mode >= 0 && mode < MIG_MODE__MAX);
+    return mode;
 }
 
 int migrate_multifd_channels(void)
-- 
2.41.0