From 6dcae534e82520aa2280009de4b78a19059e8bbb Mon Sep 17 00:00:00 2001 From: Roman Kagan Date: Thu, 11 Nov 2021 18:33:49 +0300 Subject: vhost-backend: avoid overflow on memslots_limit Fix the (hypothetical) potential problem when the value parsed out of the vhost module parameter in sysfs overflows the return value from vhost_kernel_memslots_limit. Signed-off-by: Roman Kagan Message-Id: <20211111153354.18807-6-rvkagan@yandex-team.ru> Reviewed-by: Michael S. Tsirkin Signed-off-by: Michael S. Tsirkin --- hw/virtio/vhost-backend.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/hw/virtio/vhost-backend.c b/hw/virtio/vhost-backend.c index b65f8f7..44f7dbb 100644 --- a/hw/virtio/vhost-backend.c +++ b/hw/virtio/vhost-backend.c @@ -58,7 +58,7 @@ static int vhost_kernel_memslots_limit(struct vhost_dev *dev) if (g_file_get_contents("/sys/module/vhost/parameters/max_mem_regions", &s, NULL, NULL)) { uint64_t val = g_ascii_strtoull(s, NULL, 10); - if (!((val == G_MAXUINT64 || !val) && errno)) { + if (val < INT_MAX && val > 0) { g_free(s); return val; } -- cgit v1.1