diff mbox series

ath6kl: wmi: prevent a shift wrapping bug in ath6kl_wmi_delete_pstream_cmd()

Message ID 20200918142732.GA909725@mwanda (mailing list archive)
State Accepted
Commit 6a950755cec1a90ddaaff3e4acb5333617441c32
Delegated to: Kalle Valo
Headers show
Series ath6kl: wmi: prevent a shift wrapping bug in ath6kl_wmi_delete_pstream_cmd() | expand

Commit Message

Dan Carpenter Sept. 18, 2020, 2:27 p.m. UTC
The "tsid" is a user controlled u8 which comes from debugfs.  Values
more than 15 are invalid because "active_tsids" is a 16 bit variable.
If the value of "tsid" is more than 31 then that leads to a shift
wrapping bug.

Fixes: 8fffd9e5ec9e ("ath6kl: Implement support for QOS-enable and QOS-disable from userspace")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
---
In the current code if the TSID bit isn't set it returns -ENODATA but
returning -EINVAL here should be fine.

 drivers/net/wireless/ath/ath6kl/wmi.c | 5 +++++
 1 file changed, 5 insertions(+)

Comments

Kalle Valo Sept. 22, 2020, 7:46 a.m. UTC | #1
Dan Carpenter <dan.carpenter@oracle.com> wrote:

> The "tsid" is a user controlled u8 which comes from debugfs.  Values
> more than 15 are invalid because "active_tsids" is a 16 bit variable.
> If the value of "tsid" is more than 31 then that leads to a shift
> wrapping bug.
> 
> Fixes: 8fffd9e5ec9e ("ath6kl: Implement support for QOS-enable and QOS-disable from userspace")
> Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
> Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

Patch applied to ath-next branch of ath.git, thanks.

6a950755cec1 ath6kl: wmi: prevent a shift wrapping bug in ath6kl_wmi_delete_pstream_cmd()
diff mbox series

Patch

diff --git a/drivers/net/wireless/ath/ath6kl/wmi.c b/drivers/net/wireless/ath/ath6kl/wmi.c
index a4339cca661f..dbc47702a268 100644
--- a/drivers/net/wireless/ath/ath6kl/wmi.c
+++ b/drivers/net/wireless/ath/ath6kl/wmi.c
@@ -2639,6 +2639,11 @@  int ath6kl_wmi_delete_pstream_cmd(struct wmi *wmi, u8 if_idx, u8 traffic_class,
 		return -EINVAL;
 	}
 
+	if (tsid >= 16) {
+		ath6kl_err("invalid tsid: %d\n", tsid);
+		return -EINVAL;
+	}
+
 	skb = ath6kl_wmi_get_new_buf(sizeof(*cmd));
 	if (!skb)
 		return -ENOMEM;