From: Christoph Hellwig <hch@lst.de>
To: Jens Axboe <axboe@kernel.dk>
Cc: Tetsuo Handa <penguin-kernel@i-love.sakura.ne.jp>,
linux-block@vger.kernel.org
Subject: [PATCH 7/9] loop: don't allow deleting an unspecified loop device
Date: Wed, 23 Jun 2021 16:59:06 +0200 [thread overview]
Message-ID: <20210623145908.92973-8-hch@lst.de> (raw)
In-Reply-To: <20210623145908.92973-1-hch@lst.de>
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>
---
drivers/block/loop.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/drivers/block/loop.c b/drivers/block/loop.c
index 01d393a60b37..58fc29f1b1ae 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
next prev parent reply other threads:[~2021-06-23 15:03 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-06-23 14:58 loop cleanups v2 Christoph Hellwig
2021-06-23 14:59 ` [PATCH 1/9] loop: reorder loop_exit Christoph Hellwig
2021-06-23 14:59 ` [PATCH 2/9] loop: reduce loop_ctl_mutex coverage in loop_exit Christoph Hellwig
2021-06-23 14:59 ` [PATCH 3/9] loop: remove the l argument to loop_add Christoph Hellwig
2021-06-23 14:59 ` [PATCH 4/9] loop: don't call loop_lookup before adding a loop device Christoph Hellwig
2021-06-23 14:59 ` [PATCH 5/9] loop: split loop_control_ioctl Christoph Hellwig
2021-06-23 14:59 ` [PATCH 6/9] loop: move loop_ctl_mutex locking into loop_add Christoph Hellwig
2021-06-23 14:59 ` Christoph Hellwig [this message]
2021-06-23 14:59 ` [PATCH 8/9] loop: split loop_lookup Christoph Hellwig
2021-06-23 14:59 ` [PATCH 9/9] loop: rewrite loop_exit using idr_for_each_entry Christoph Hellwig
2021-06-24 2:45 ` loop cleanups v2 Jens Axboe
-- strict thread matches above, loose matches on Subject: below --
2021-06-21 10:15 loop cleanups Christoph Hellwig
2021-06-21 10:15 ` [PATCH 7/9] loop: don't allow deleting an unspecified loop device Christoph Hellwig
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