We notice the QEMU may crash when the guest has too many
incoming network connections with the following log:
15197@1593578622.668573:colo_proxy_main : colo proxy connection hashtable full,
clear it
free(): invalid pointer
[1] 15195 abort (core dumped) qemu-system-x86_64 ....
This is because we create the s->connection_track_table with
g_hash_table_new_full() which is defined as:
GHashTable * g_hash_table_new_full (GHashFunc hash_func,
GEqualFunc key_equal_func,
GDestroyNotify key_destroy_func,
GDestroyNotify value_destroy_func);
The fourth parameter connection_destroy() will be called to free the
memory allocated for all 'Connection' values in the hashtable when
we call g_hash_table_remove_all() in the connection_hashtable_reset().
But both connection_track_table and conn_list reference to the same
conn instance. It will trigger double free in conn_list clear. So this
patch remove free action on hash table side to avoid double free the
conn.
Signed-off-by: Like Xu <like...@linux.intel.com>
Signed-off-by: Zhang Chen <chen.zh...@intel.com>
---
net/colo-compare.c | 2 +-
net/filter-rewriter.c | 2 +-
2 files changed, 2 insertions(+), 2 deletions(-)
diff --git a/net/colo-compare.c b/net/colo-compare.c
index 62554b5b3c..ab054cfd21 100644
--- a/net/colo-compare.c
+++ b/net/colo-compare.c
@@ -1324,7 +1324,7 @@ static void colo_compare_complete(UserCreatable *uc,
Error **errp)
s->connection_track_table = g_hash_table_new_full(connection_key_hash,
connection_key_equal,
g_free,
- connection_destroy);
+ NULL);
colo_compare_iothread(s);
diff --git a/net/filter-rewriter.c b/net/filter-rewriter.c
index bf05023dc3..c18c4c2019 100644
--- a/net/filter-rewriter.c
+++ b/net/filter-rewriter.c
@@ -383,7 +383,7 @@ static void colo_rewriter_setup(NetFilterState *nf, Error
**errp)
s->connection_track_table = g_hash_table_new_full(connection_key_hash,
connection_key_equal,
g_free,
- connection_destroy);
+ NULL);
s->incoming_queue = qemu_new_net_queue(qemu_netfilter_pass_to_next, nf);
}
--
2.25.1
