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scsi: tcmu: check if dev is configured before block/reset

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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>
Reviewed-by: Xiubo Li <xiubli@redhat.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Mike Christie 2018-07-23 14:07:47 -05:00 committed by Martin K. Petersen
parent 63d5be0f6a
commit a30b0473b6
1 changed files with 10 additions and 0 deletions
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10
drivers/target/target_core_user.c
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@ -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;