[v3,for-4.4,1/7] Drivers: hv: don't leak memory in vmbus_establish_gpadl()

Message ID 1492673923-1352-2-git-send-email-sumit.semwal@linaro.org
State New
Headers show
Series
  • hv patches for 4.4.y (resubmit)
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Commit Message

Sumit Semwal April 20, 2017, 7:38 a.m.
From: Vitaly Kuznetsov <vkuznets@redhat.com>


[ Upstream commit 7cc80c98070ccc7940fc28811c92cca0a681015d ]

In some cases create_gpadl_header() allocates submessages but we never
free them.

[sumits] Note for stable:
Upstream commit 4d63763296ab7865a98bc29cc7d77145815ef89f:
(Drivers: hv: get rid of redundant messagecount in create_gpadl_header())
changes the list usage to initialize list header in all cases; that patch
isn't added to stable, so the current patch is modified a little bit from
the upstream commit to check if the list is valid or not.

Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>

Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>

Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Signed-off-by: Sumit Semwal <sumit.semwal@linaro.org>

---
 drivers/hv/channel.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

-- 
2.7.4

Patch

diff --git a/drivers/hv/channel.c b/drivers/hv/channel.c
index 1ef37c7..49d2449 100644
--- a/drivers/hv/channel.c
+++ b/drivers/hv/channel.c
@@ -375,7 +375,7 @@  int vmbus_establish_gpadl(struct vmbus_channel *channel, void *kbuffer,
 	struct vmbus_channel_gpadl_header *gpadlmsg;
 	struct vmbus_channel_gpadl_body *gpadl_body;
 	struct vmbus_channel_msginfo *msginfo = NULL;
-	struct vmbus_channel_msginfo *submsginfo;
+	struct vmbus_channel_msginfo *submsginfo, *tmp;
 	u32 msgcount;
 	struct list_head *curr;
 	u32 next_gpadl_handle;
@@ -437,6 +437,13 @@  cleanup:
 	list_del(&msginfo->msglistentry);
 	spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags);
 
+	if (msgcount > 1) {
+		list_for_each_entry_safe(submsginfo, tmp, &msginfo->submsglist,
+			 msglistentry) {
+			kfree(submsginfo);
+		}
+	}
+
 	kfree(msginfo);
 	return ret;
 }