From: Lee Gibson <leegib@gmail.com> To: gregkh@linuxfoundation.org Cc: dan.carpenter@oracle.com, devel@driverdev.osuosl.org, linux-kernel@vger.kernel.org, Lee Gibson <leegib@gmail.com> Subject: [PATCH v3] staging: rtl8192e: Fix possible buffer overflow in _rtl92e_wx_set_scan Date: Fri, 26 Feb 2021 14:51:57 +0000 [thread overview] Message-ID: <20210226145157.424065-1-leegib@gmail.com> (raw) Function _rtl92e_wx_set_scan calls memcpy without checking the length. A user could control that length and trigger a buffer overflow. Fix by checking the length is within the maximum allowed size. Reviewed-by: Dan Carpenter <dan.carpenter@oracle.com> Signed-off-by: Lee Gibson <leegib@gmail.com> --- drivers/staging/rtl8192e/rtl8192e/rtl_wx.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) diff --git a/drivers/staging/rtl8192e/rtl8192e/rtl_wx.c b/drivers/staging/rtl8192e/rtl8192e/rtl_wx.c index 16bcee13f64b..407effde5e71 100644 --- a/drivers/staging/rtl8192e/rtl8192e/rtl_wx.c +++ b/drivers/staging/rtl8192e/rtl8192e/rtl_wx.c @@ -406,9 +406,10 @@ static int _rtl92e_wx_set_scan(struct net_device *dev, struct iw_scan_req *req = (struct iw_scan_req *)b; if (req->essid_len) { - ieee->current_network.ssid_len = req->essid_len; - memcpy(ieee->current_network.ssid, req->essid, - req->essid_len); + int len = min_t(int, req->essid_len, IW_ESSID_MAX_SIZE); + + ieee->current_network.ssid_len = len; + memcpy(ieee->current_network.ssid, req->essid, len); } } -- 2.25.1
WARNING: multiple messages have this Message-ID (diff)
From: Lee Gibson <leegib@gmail.com> To: gregkh@linuxfoundation.org Cc: devel@driverdev.osuosl.org, linux-kernel@vger.kernel.org, dan.carpenter@oracle.com, Lee Gibson <leegib@gmail.com> Subject: [PATCH v3] staging: rtl8192e: Fix possible buffer overflow in _rtl92e_wx_set_scan Date: Fri, 26 Feb 2021 14:51:57 +0000 [thread overview] Message-ID: <20210226145157.424065-1-leegib@gmail.com> (raw) Function _rtl92e_wx_set_scan calls memcpy without checking the length. A user could control that length and trigger a buffer overflow. Fix by checking the length is within the maximum allowed size. Reviewed-by: Dan Carpenter <dan.carpenter@oracle.com> Signed-off-by: Lee Gibson <leegib@gmail.com> --- drivers/staging/rtl8192e/rtl8192e/rtl_wx.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) diff --git a/drivers/staging/rtl8192e/rtl8192e/rtl_wx.c b/drivers/staging/rtl8192e/rtl8192e/rtl_wx.c index 16bcee13f64b..407effde5e71 100644 --- a/drivers/staging/rtl8192e/rtl8192e/rtl_wx.c +++ b/drivers/staging/rtl8192e/rtl8192e/rtl_wx.c @@ -406,9 +406,10 @@ static int _rtl92e_wx_set_scan(struct net_device *dev, struct iw_scan_req *req = (struct iw_scan_req *)b; if (req->essid_len) { - ieee->current_network.ssid_len = req->essid_len; - memcpy(ieee->current_network.ssid, req->essid, - req->essid_len); + int len = min_t(int, req->essid_len, IW_ESSID_MAX_SIZE); + + ieee->current_network.ssid_len = len; + memcpy(ieee->current_network.ssid, req->essid, len); } } -- 2.25.1 _______________________________________________ devel mailing list devel@linuxdriverproject.org http://driverdev.linuxdriverproject.org/mailman/listinfo/driverdev-devel
next reply other threads:[~2021-02-26 14:53 UTC|newest] Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top 2021-02-26 14:51 Lee Gibson [this message] 2021-02-26 14:51 ` [PATCH v3] staging: rtl8192e: Fix possible buffer overflow in _rtl92e_wx_set_scan Lee Gibson 2021-02-26 15:06 ` Dan Carpenter 2021-02-26 15:06 ` Dan Carpenter
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