diff mbox series

[5/9] tcmu: check if dev is configured before block/reset

Message ID 1532372871-7128-6-git-send-email-mchristi@redhat.com (mailing list archive)
State New, archived
Headers show
Series tcmu: configuration fixes and cleanups | expand

Commit Message

Mike Christie July 23, 2018, 7:07 p.m. UTC 
Do not allow userspace to block or reset the ring until the device has
been configured. This will prevent the bug where userspace can write to
those files and access mb_addr before it has been setup.

Signed-off-by: Mike Christie <mchristi@redhat.com>
---
 drivers/target/target_core_user.c | 10 ++++++++++
 1 file changed, 10 insertions(+)
diff mbox series

Patch

diff --git a/drivers/target/target_core_user.c b/drivers/target/target_core_user.c
index bc8121f..d6b4022 100644
--- a/drivers/target/target_core_user.c
+++ b/drivers/target/target_core_user.c
@@ -2480,6 +2480,11 @@  static ssize_t tcmu_block_dev_store(struct config_item *item, const char *page,
 	u8 val;
 	int ret;
 
+	if (!target_dev_configured(&udev->se_dev)) {
+		pr_err("Device is not configured.\n");
+		return -EINVAL;
+	}
+
 	ret = kstrtou8(page, 0, &val);
 	if (ret < 0)
 		return ret;
@@ -2507,6 +2512,11 @@  static ssize_t tcmu_reset_ring_store(struct config_item *item, const char *page,
 	u8 val;
 	int ret;
 
+	if (!target_dev_configured(&udev->se_dev)) {
+		pr_err("Device is not configured.\n");
+		return -EINVAL;
+	}
+
 	ret = kstrtou8(page, 0, &val);
 	if (ret < 0)
 		return ret;