Passing a negative index to loop_lookup while return any unbound device.
Doing that for a delete does not make much sense, so add check to
explicitly reject that case.
Signed-off-by: Christoph Hellwig <hch@xxxxxx>
---
drivers/block/loop.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/drivers/block/loop.c b/drivers/block/loop.c
index 3f1e934a7f9e..54e2551e339c 100644
--- a/drivers/block/loop.c
+++ b/drivers/block/loop.c
@@ -2235,6 +2235,11 @@ static int loop_control_remove(int idx)
{
struct loop_device *lo;
int ret;
+
+ if (idx < 0) {
+ pr_warn("deleting an unspecified loop device is not supported.\n");
+ return -EINVAL;
+ }
ret = mutex_lock_killable(&loop_ctl_mutex);
if (ret)
--
2.30.2
