[PATCH 4.4 81/96] ath10k: fix potential memory leak in ath10k_wmi_tlv_op_pull_fw_stats()

[Greg Kroah-Hartman]

4.4-stable review patch.  If anyone has any objections, please let me know.

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

From: Christian Lamparter <chunk...@googlemail.com>


[ Upstream commit 097e46d2ae90265d1afe141ba6208ba598b79e01 ]

ath10k_wmi_tlv_op_pull_fw_stats() uses tb = ath10k_wmi_tlv_parse_alloc(...)
function, which allocates memory. If any of the three error-paths are
taken, this tb needs to be freed.

Signed-off-by: Christian Lamparter <chunk...@googlemail.com>
Signed-off-by: Kalle Valo <kv...@qca.qualcomm.com>
Signed-off-by: Sasha Levin <alexander.le...@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
 drivers/net/wireless/ath/ath10k/wmi-tlv.c |   12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

--- a/drivers/net/wireless/ath/ath10k/wmi-tlv.c
+++ b/drivers/net/wireless/ath/ath10k/wmi-tlv.c
@@ -1105,8 +1105,10 @@ static int ath10k_wmi_tlv_op_pull_fw_sta
                struct ath10k_fw_stats_pdev *dst;
 
                src = data;
-               if (data_len < sizeof(*src))
+               if (data_len < sizeof(*src)) {
+                       kfree(tb);
                        return -EPROTO;
+               }
 
                data += sizeof(*src);
                data_len -= sizeof(*src);
@@ -1126,8 +1128,10 @@ static int ath10k_wmi_tlv_op_pull_fw_sta
                struct ath10k_fw_stats_vdev *dst;
 
                src = data;
-               if (data_len < sizeof(*src))
+               if (data_len < sizeof(*src)) {
+                       kfree(tb);
                        return -EPROTO;
+               }
 
                data += sizeof(*src);
                data_len -= sizeof(*src);
@@ -1145,8 +1149,10 @@ static int ath10k_wmi_tlv_op_pull_fw_sta
                struct ath10k_fw_stats_peer *dst;
 
                src = data;
-               if (data_len < sizeof(*src))
+               if (data_len < sizeof(*src)) {
+                       kfree(tb);
                        return -EPROTO;
+               }
 
                data += sizeof(*src);
                data_len -= sizeof(*src);