[PATCH 4.4 66/88] wil6210: missing length check in wmi_set_ie

Greg Kroah-Hartman
2018-12-14T12:19:16Z

From: Lior David <qca_liord@qca.qualcomm.com>

commit b5a8ffcae4103a9d823ea3aa3a761f65779fbe2a upstream.

Add a length check in wmi_set_ie to detect unsigned integer
overflow.

Signed-off-by: Lior David <qca_liord@qca.qualcomm.com>
Signed-off-by: Maya Erez <qca_merez@qca.qualcomm.com>
Signed-off-by: Kalle Valo <kvalo@qca.qualcomm.com>
Signed-off-by: Ben Hutchings <ben.hutchings@codethink.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/net/wireless/ath/wil6210/wmi.c | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)

--- a/drivers/net/wireless/ath/wil6210/wmi.c
+++ b/drivers/net/wireless/ath/wil6210/wmi.c
@@ -1035,8 +1035,14 @@ int wmi_set_ie(struct wil6210_priv *wil,
};
int rc;
u16 len = sizeof(struct wmi_set_appie_cmd) + ie_len;
- struct wmi_set_appie_cmd *cmd = kzalloc(len, GFP_KERNEL);
+ struct wmi_set_appie_cmd *cmd;

+ if (len < ie_len) {
+ rc = -EINVAL;
+ goto out;
+ }
+
+ cmd = kzalloc(len, GFP_KERNEL);
if (!cmd) {
rc = -ENOMEM;
goto out;