From: Navid Emamdoost navid.emamdoost@gmail.com
[ Upstream commit 31edf4bbe0ba27fd03ac7d87eb2ee3d2a231af6d ]
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: 47d902b90a32 ("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: Sasha Levin sashal@kernel.org --- drivers/block/nbd.c | 6 ++++++ 1 file changed, 6 insertions(+)
diff --git a/drivers/block/nbd.c b/drivers/block/nbd.c index 37994a7a1b6f4..f2d847ffcbc75 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) {