| Message ID | 20200918142732.GA909725@mwanda |
|---|---|
| State | New |
| Headers | show |
| Series | ath6kl: wmi: prevent a shift wrapping bug in ath6kl_wmi_delete_pstream_cmd() | expand |
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 --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;
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(+)