From: Dan Carpenter Date: Fri, 18 Sep 2020 14:27:32 +0000 (+0300) Subject: ath6kl: wmi: prevent a shift wrapping bug in ath6kl_wmi_delete_pstream_cmd() X-Git-Tag: v4.9.241~97 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=e2635d595678c5abff21223fa571d4c98bc57918;p=platform%2Fkernel%2Flinux-amlogic.git ath6kl: wmi: prevent a shift wrapping bug in ath6kl_wmi_delete_pstream_cmd() [ Upstream commit 6a950755cec1a90ddaaff3e4acb5333617441c32 ] 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 Signed-off-by: Kalle Valo Link: https://lore.kernel.org/r/20200918142732.GA909725@mwanda Signed-off-by: Sasha Levin --- diff --git a/drivers/net/wireless/ath/ath6kl/wmi.c b/drivers/net/wireless/ath/ath6kl/wmi.c index 55609fc4e50e..73eab12cb3bd 100644 --- a/drivers/net/wireless/ath/ath6kl/wmi.c +++ b/drivers/net/wireless/ath/ath6kl/wmi.c @@ -2648,6 +2648,11 @@ 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;