From: Navid Emamdoost navid.emamdoost@gmail.com

maillist inclusion category: bugfix bugzilla: https://gitee.com/openeuler/kernel/issues/I8NC0E CVE: CVE-2019-16089

Reference: https://lore.kernel.org/lkml/20190911164013.27364-1-navid.emamdoost@gmail.co...

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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 navid.emamdoost@gmail.com Reviewed-by: Michal Kubecek mkubecek@suse.cz --- drivers/block/nbd.c | 6 ++++++ 1 file changed, 6 insertions(+)

diff --git a/drivers/block/nbd.c b/drivers/block/nbd.c index 855fdf5c3b4e..b99c169890d5 100644 --- a/drivers/block/nbd.c +++ b/drivers/block/nbd.c @@ -2408,6 +2408,12 @@ 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) {