Re: [PATCH] dm-zoned: free dmz->ddev array in dmz_put_zoned_device

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On 9/20/23 12:51, Fedor Pchelkin wrote:
Commit 4dba12881f88 ("dm zoned: support arbitrary number of devices")
made the pointers to additional zoned devices to be stored in a
dynamically allocated dmz->ddev array. However, this array is not freed.

Free it when cleaning up zoned device information inside
dmz_put_zoned_device(). Assigning NULL to dmz->ddev elements doesn't make
sense there as they are not supposed to be reused later and the whole dmz
target structure is being cleaned anyway.

Found by Linux Verification Center (

Fixes: 4dba12881f88 ("dm zoned: support arbitrary number of devices")
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Fedor Pchelkin <pchelkin@xxxxxxxxx>
  drivers/md/dm-zoned-target.c | 8 +++-----
  1 file changed, 3 insertions(+), 5 deletions(-)

diff --git a/drivers/md/dm-zoned-target.c b/drivers/md/dm-zoned-target.c
index ad8e670a2f9b..e25cd9db6275 100644
--- a/drivers/md/dm-zoned-target.c
+++ b/drivers/md/dm-zoned-target.c
@@ -753,12 +753,10 @@ static void dmz_put_zoned_device(struct dm_target *ti)
  	struct dmz_target *dmz = ti->private;
  	int i;
- for (i = 0; i < dmz->nr_ddevs; i++) {
-		if (dmz->ddev[i]) {
+	for (i = 0; i < dmz->nr_ddevs; i++)
+		if (dmz->ddev[i])
  			dm_put_device(ti, dmz->ddev[i]);
-			dmz->ddev[i] = NULL;
-		}
-	}
+	kfree(dmz->ddev);
static int dmz_fixup_devices(struct dm_target *ti)

Hmm. I'm not that happy with it; dmz_put_zoned_device() is using dm_target as an argument, whereas all of the functions surrounding the call sites is using the dmz_target directly.

Mind to modify the function to use 'struct dmz_target' as an argument?


Dr. Hannes Reinecke                Kernel Storage Architect
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