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nbd: null check for nla_nest_start 

[ Upstream commit 31edf4bbe0ba27fd03ac7d87eb2ee3d2a231af6d ]

Fix CVE: CVE-2024-27025

nla_nest_start() may fail and return NULL. Insert a check and set errno
based on other call sites within the same source code.

Signed-off-by: Navid Emamdoost <navid.emamdoost@gmail.com>
Reviewed-by: Michal Kubecek <mkubecek@suse.cz>
Fixes: 47d902b90a ("nbd: add a status netlink command")
Signed-off-by: Kees Cook <keescook@chromium.org>
Link: https://lore.kernel.org/r/20240218042534.it.206-kees@kernel.org
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Haisu Wang <haisuwang@tencent.com>
This commit is contained in:
Navid Emamdoost 2024-02-17 20:25:38 -08:00 committed by Jianping Liu
parent 81bc79fff4
commit b8bd6eb711
1 changed files with 6 additions and 0 deletions
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6
drivers/block/nbd.c
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@ -2317,6 +2317,12 @@ 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) {