[Devel] [PATCH RHEL7 COMMIT] ploop: Fix leak of discard kreq

[Vasily Averin]

The commit is pushed to "branch-rh7-3.10.0-1160.25.1.vz7.180.x-ovz" and will appear at https://src.openvz.org/scm/ovz/vzkernel.git
after rh7-3.10.0-1160.25.1.vz7.180.3
------>
commit dfb578614c416c40d78446cc2661d1c318d33caf
Author: Kirill Tkhai <ktkhai at virtuozzo.com>
Date:   Tue May 18 08:15:27 2021 +0300

    ploop: Fix leak of discard kreq
    
    In case of kaio is async, kreq is freed from endio.
    In case of sync kreq, we should free it ourselves.
    
    https://jira.sw.ru/browse/PSBM-129412
    Fixes: commit d2709bb9ac22 "ploop: Enable 1M holes with zeroing indexes for io_kaio"
    Reported-by: Alexey Bilan <alexey.bilan at virtuozzo.com>
    Signed-off-by: Kirill Tkhai <ktkhai at virtuozzo.com>
---
 drivers/block/ploop/io_kaio.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/block/ploop/io_kaio.c b/drivers/block/ploop/io_kaio.c
index 44df242d8128..bc245ea3a5b3 100644
--- a/drivers/block/ploop/io_kaio.c
+++ b/drivers/block/ploop/io_kaio.c
@@ -191,6 +191,7 @@ static int kaio_kernel_submit(struct file *file, struct kaio_req *kreq,
 				    pos, count);
 			if (err == 0) {
 				kaio_complete_io_request(kreq->preq);
+				kfree(kreq);
 				/* Otherwise, caller decrements counter */
 			}
 			return err;