From: Navid Emamdoost
maillist inclusion
category: bugfix
issue: #I4NRS5
CVE: CVE-2019-16089
Reference: https://lore.kernel.org/lkml/20190911164013.27364-1-navid.emamdoost@gmail.co...
---------------------------
nla_nest_start may fail and return NULL. The check is inserted, and
errno is selected based on other call sites within the same source code.
Update: removed extra new line.
v3 Update: added release reply, thanks to Michal Kubecek for pointing
out.
Signed-off-by: Navid Emamdoost
Reviewed-by: Michal Kubecek
Signed-off-by: Lijun Fang
Reviewed-by: Jason Yan
Reviewed-by: Xiu Jianfeng
Signed-off-by: Chen Jun
Signed-off-by: Zheng Zengkai
Signed-off-by: Yu Changchun
---
drivers/block/nbd.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/drivers/block/nbd.c b/drivers/block/nbd.c
index 59c452fff835..f7f1d9dbdc80 100644
--- a/drivers/block/nbd.c
+++ b/drivers/block/nbd.c
@@ -2313,6 +2313,12 @@ static int nbd_genl_status(struct sk_buff *skb, struct genl_info *info)
}
dev_list = nla_nest_start_noflag(reply, NBD_ATTR_DEVICE_LIST);
+ if (!dev_list) {
+ nlmsg_free(reply);
+ ret = -EMSGSIZE;
+ goto out;
+ }
+
if (index == -1) {
ret = idr_for_each(&nbd_index_idr, &status_cb, reply);
if (ret) {
--
2.25.1
