From d3a9b0cadf8cea1746a6bf525d049198e705836a Mon Sep 17 00:00:00 2001 From: Chaitanya Kulkarni Date: Thu, 30 Jan 2020 10:29:33 -0800 Subject: [PATCH] nvmet: check sscanf value for subsys serial attr For nvmet in configfs.c we check return values for all the sscanf() calls. Add similar check into the nvmet_subsys_attr_serial_store(). Reviewed-by: Christoph Hellwig Reviewed-by: Sagi Grimberg Signed-off-by: Chaitanya Kulkarni Signed-off-by: Keith Busch --- drivers/nvme/target/configfs.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) diff --git a/drivers/nvme/target/configfs.c b/drivers/nvme/target/configfs.c index 1654064deea52..7aa10788b7c87 100644 --- a/drivers/nvme/target/configfs.c +++ b/drivers/nvme/target/configfs.c @@ -849,10 +849,13 @@ static ssize_t nvmet_subsys_attr_serial_show(struct config_item *item, static ssize_t nvmet_subsys_attr_serial_store(struct config_item *item, const char *page, size_t count) { - struct nvmet_subsys *subsys = to_subsys(item); + u64 serial; + + if (sscanf(page, "%llx\n", &serial) != 1) + return -EINVAL; down_write(&nvmet_config_sem); - sscanf(page, "%llx\n", &subsys->serial); + to_subsys(item)->serial = serial; up_write(&nvmet_config_sem); return count; -- 2.30.2