lkml.org 
[lkml]   [2019]   [Mar]   [22]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 5.0 059/238] vmw_balloon: release lock on error in vmballoon_reset()
Date
5.0-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Dan Carpenter <dan.carpenter@oracle.com>

commit d04071a5d6413b65f17f7bd6e2bdb22e22e4ace7 upstream.

We added some locking to this function but forgot to drop the lock on
these two error paths. This bug would lead to an immediate deadlock.

Fixes: c7b3690fb152 ("vmw_balloon: stats rework")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Cc: stable@vger.kernel.org
Reviewed-by: Nadav Amit <namit@vmware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
drivers/misc/vmw_balloon.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)

--- a/drivers/misc/vmw_balloon.c
+++ b/drivers/misc/vmw_balloon.c
@@ -1287,7 +1287,7 @@ static void vmballoon_reset(struct vmbal
vmballoon_pop(b);

if (vmballoon_send_start(b, VMW_BALLOON_CAPABILITIES))
- return;
+ goto unlock;

if ((b->capabilities & VMW_BALLOON_BATCHED_CMDS) != 0) {
if (vmballoon_init_batching(b)) {
@@ -1298,7 +1298,7 @@ static void vmballoon_reset(struct vmbal
* The guest will retry in one second.
*/
vmballoon_send_start(b, 0);
- return;
+ goto unlock;
}
} else if ((b->capabilities & VMW_BALLOON_BASIC_CMDS) != 0) {
vmballoon_deinit_batching(b);
@@ -1314,6 +1314,7 @@ static void vmballoon_reset(struct vmbal
if (vmballoon_send_guest_id(b))
pr_err("failed to send guest ID to the host\n");

+unlock:
up_write(&b->conf_sem);
}


\
 
 \ /
  Last update: 2019-03-22 13:33    [W:0.562 / U:7.400 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site