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

Greg Kroah-Hartman
2017-11-28T10:31:17Z

From: Christian Lamparter <chunkeey@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 <chunkeey@googlemail.com>
Signed-off-by: Kalle Valo <kvalo@qca.qualcomm.com>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@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);