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| author | Christoph Hellwig <hch@lst.de> | 2021-06-23 16:59:06 +0200 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2021-06-30 15:34:13 -0600 |
| commit | e5d66a10324f2a0c31153fd6210d99a9d00ef047 (patch) | |
| tree | be57a00068fe215620f6a026f57412e27ed97e3f /drivers/block/loop.c | |
| parent | 18d1f200b3807c383d80cc00d6bbdee288e63b1f (diff) | |
| download | linux-e5d66a10324f2a0c31153fd6210d99a9d00ef047.tar.gz | |
loop: don't allow deleting an unspecified loop device
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@lst.de>
Link: https://lore.kernel.org/r/20210623145908.92973-8-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'drivers/block/loop.c')
| -rw-r--r-- | drivers/block/loop.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/block/loop.c b/drivers/block/loop.c index c18e2930ca11fa..b217065a6d67e0 100644 --- a/drivers/block/loop.c +++ b/drivers/block/loop.c @@ -2404,6 +2404,11 @@ 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) |