This is a note to let you know that I've just added the patch titled
staging: rtl8712: Fix possible buffer overflow in
to my staging git tree which can be found at
git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging.git
in the staging-linus branch.
The patch will show up in the next release of the linux-next tree
(usually sometime within the next 24 hours during the week.)
The patch will hopefully also be merged in Linus's tree for the
next -rc kernel release.
If you have any questions about this process, please let me know.
>From def9c897e73e89780c7f13a81aef60db2bdeaddc Mon Sep 17 00:00:00 2001
From: Lee Gibson <leegib@xxxxxxxxx>
Date: Mon, 1 Mar 2021 13:26:48 +0000
Subject: staging: rtl8712: Fix possible buffer overflow in
r8712_sitesurvey_cmd
Function r8712_sitesurvey_cmd 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.
Signed-off-by: Lee Gibson <leegib@xxxxxxxxx>
Link: https://lore.kernel.org/r/20210301132648.420296-1-leegib@xxxxxxxxx
Cc: stable <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/staging/rtl8712/rtl871x_cmd.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/drivers/staging/rtl8712/rtl871x_cmd.c b/drivers/staging/rtl8712/rtl871x_cmd.c
index 18116469bd31..75716f59044d 100644
--- a/drivers/staging/rtl8712/rtl871x_cmd.c
+++ b/drivers/staging/rtl8712/rtl871x_cmd.c
@@ -192,8 +192,10 @@ u8 r8712_sitesurvey_cmd(struct _adapter *padapter,
psurveyPara->ss_ssidlen = 0;
memset(psurveyPara->ss_ssid, 0, IW_ESSID_MAX_SIZE + 1);
if (pssid && pssid->SsidLength) {
- memcpy(psurveyPara->ss_ssid, pssid->Ssid, pssid->SsidLength);
- psurveyPara->ss_ssidlen = cpu_to_le32(pssid->SsidLength);
+ int len = min_t(int, pssid->SsidLength, IW_ESSID_MAX_SIZE);
+
+ memcpy(psurveyPara->ss_ssid, pssid->Ssid, len);
+ psurveyPara->ss_ssidlen = cpu_to_le32(len);
}
set_fwstate(pmlmepriv, _FW_UNDER_SURVEY);
r8712_enqueue_cmd(pcmdpriv, ph2c);
--
2.30.1
