From f22a57ac09abdd5afd8a974b52c19eda9347cffd Mon Sep 17 00:00:00 2001 From: Andrew Melnychenko Date: Wed, 4 Mar 2020 16:20:58 +0200 Subject: [PATCH] Fixed integer overflow in e1000e MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit Buglink: https://bugzilla.redhat.com/show_bug.cgi?id=1737400 Fixed setting max_queue_num if there are no peers in NICConf. qemu_new_nic() creates NICState with 1 NetClientState(index 0) without peers, set max_queue_num to 0 - It prevents undefined behavior and possible crashes, especially during pcie hotplug. Fixes: 6f3fbe4ed06 ("net: Introduce e1000e device emulation") Signed-off-by: Andrew Melnychenko Reviewed-by: Philippe Mathieu-Daudé Reviewed-by: Dmitry Fleytman Signed-off-by: Jason Wang --- hw/net/e1000e.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/hw/net/e1000e.c b/hw/net/e1000e.c index a91dbdca3cb..f2cc1552c58 100644 --- a/hw/net/e1000e.c +++ b/hw/net/e1000e.c @@ -328,7 +328,7 @@ e1000e_init_net_peer(E1000EState *s, PCIDevice *pci_dev, uint8_t *macaddr) s->nic = qemu_new_nic(&net_e1000e_info, &s->conf, object_get_typename(OBJECT(s)), dev->id, s); - s->core.max_queue_num = s->conf.peers.queues - 1; + s->core.max_queue_num = s->conf.peers.queues ? s->conf.peers.queues - 1 : 0; trace_e1000e_mac_set_permanent(MAC_ARG(macaddr)); memcpy(s->core.permanent_mac, macaddr, sizeof(s->core.permanent_mac)); -- 2.39.5