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mwifiex: Fix possible buffer overflows in mwifiex_cmd_802_11_ad_hoc_start 

[ Upstream commit 5c455c5ab3 ]

mwifiex_cmd_802_11_ad_hoc_start() calls memcpy() without checking
the destination size may trigger a buffer overflower,
which a local user could use to cause denial of service
or the execution of arbitrary code.
Fix it by putting the length check before calling memcpy().

Signed-off-by: Zhang Xiaohui <ruc_zhangxiaohui@163.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Link: https://lore.kernel.org/r/20201206084801.26479-1-ruc_zhangxiaohui@163.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
5.4-rM2-2.2.x-imx-squashed
Zhang Xiaohui 2020-12-06 16:48:01 +08:00 committed by Greg Kroah-Hartman
parent 117433236a
commit 0a49aaf4df
1 changed files with 2 additions and 0 deletions
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2
drivers/net/wireless/marvell/mwifiex/join.c
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@ -877,6 +877,8 @@ mwifiex_cmd_802_11_ad_hoc_start(struct mwifiex_private *priv,
memset(adhoc_start->ssid, 0, IEEE80211_MAX_SSID_LEN);
if (req_ssid->ssid_len > IEEE80211_MAX_SSID_LEN)
req_ssid->ssid_len = IEEE80211_MAX_SSID_LEN;
memcpy(adhoc_start->ssid, req_ssid->ssid, req_ssid->ssid_len);
mwifiex_dbg(adapter, INFO, "info: ADHOC_S_CMD: SSID = %s\n",