The use of sprintf with format string here means that there is a risk
that the writes will go out of bounds, replace it with scnprintf.
In one block of the translate_scan function sprintf is only called once
(it's not being used to concatenate strings) so there is no need to keep
the pointer "p", remove it.
Signed-off-by: Candy Febriyanto <cfebriya...@gmail.com>
---
Changed since V1:
- Dan Carpenter: assign the return value of scnprintf to the length
variable instead of calling strlen
.../staging/rtl8723bs/os_dep/ioctl_linux.c | 23 +++++++++----------
drivers/staging/rtl8723bs/os_dep/mlme_linux.c | 6 ++---
2 files changed, 14 insertions(+), 15 deletions(-)
diff --git a/drivers/staging/rtl8723bs/os_dep/ioctl_linux.c
b/drivers/staging/rtl8723bs/os_dep/ioctl_linux.c
index 41389e266f54..78ba2423ed65 100644
--- a/drivers/staging/rtl8723bs/os_dep/ioctl_linux.c
+++ b/drivers/staging/rtl8723bs/os_dep/ioctl_linux.c
@@ -240,9 +240,10 @@ static char *translate_scan(struct adapter *padapter,
return start;
if (wpa_len > 0) {
p = buf;
- p += sprintf(p, "wpa_ie =");
+ p += scnprintf(p, (MAX_WPA_IE_LEN * 2) - (p - buf),
"wpa_ie =");
for (i = 0; i < wpa_len; i++)
- p += sprintf(p, "%02x", wpa_ie[i]);
+ p += scnprintf(p, (MAX_WPA_IE_LEN * 2) - (p -
buf),
+ "%02x", wpa_ie[i]);
if (wpa_len > 100) {
printk("-----------------Len
%d----------------\n", wpa_len);
@@ -265,9 +266,10 @@ static char *translate_scan(struct adapter *padapter,
if (rsn_len > 0) {
p = buf;
memset(buf, 0, MAX_WPA_IE_LEN*2);
- p += sprintf(p, "rsn_ie =");
+ p += scnprintf(p, (MAX_WPA_IE_LEN * 2) - (p - buf),
"rsn_ie =");
for (i = 0; i < rsn_len; i++)
- p += sprintf(p, "%02x", rsn_ie[i]);
+ p += scnprintf(p, (MAX_WPA_IE_LEN * 2) - (p -
buf),
+ "%02x", rsn_ie[i]);
memset(&iwe, 0, sizeof(iwe));
iwe.cmd = IWEVCUSTOM;
iwe.u.data.length = strlen(buf);
@@ -365,17 +367,16 @@ static char *translate_scan(struct adapter *padapter,
{
u8 *buf;
- u8 *p, *pos;
+ u8 *pos;
buf = kzalloc(MAX_WPA_IE_LEN, GFP_ATOMIC);
if (!buf)
goto exit;
- p = buf;
+
pos = pnetwork->network.Reserved;
- p += sprintf(p, "fm =%02X%02X", pos[1], pos[0]);
memset(&iwe, 0, sizeof(iwe));
iwe.cmd = IWEVCUSTOM;
- iwe.u.data.length = strlen(buf);
+ iwe.u.data.length = scnprintf(buf, MAX_WPA_IE_LEN, "fm
=%02X%02X", pos[1], pos[0]);
start = iwe_stream_add_point(info, start, stop, &iwe, buf);
kfree(buf);
}
@@ -5082,8 +5083,7 @@ static int rtw_ioctl_wext_private(struct net_device *dev,
union iwreq_data *wrq_
case IW_PRIV_TYPE_BYTE:
/* Display args */
for (j = 0; j < n; j++) {
- sprintf(str, "%d ", extra[j]);
- len = strlen(str);
+ len = scnprintf(str, sizeof(str), "%d ",
extra[j]);
output_len = strlen(output);
if ((output_len + len + 1) > 4096) {
err = -E2BIG;
@@ -5096,8 +5096,7 @@ static int rtw_ioctl_wext_private(struct net_device *dev,
union iwreq_data *wrq_
case IW_PRIV_TYPE_INT:
/* Display args */
for (j = 0; j < n; j++) {
- sprintf(str, "%d ", ((__s32 *)extra)[j]);
- len = strlen(str);
+ len = scnprintf(str, sizeof(str), "%d ",
((__s32 *)extra)[j]);
output_len = strlen(output);
if ((output_len + len + 1) > 4096) {
err = -E2BIG;
diff --git a/drivers/staging/rtl8723bs/os_dep/mlme_linux.c
b/drivers/staging/rtl8723bs/os_dep/mlme_linux.c
index d46c65ab384b..20899b2cff43 100644
--- a/drivers/staging/rtl8723bs/os_dep/mlme_linux.c
+++ b/drivers/staging/rtl8723bs/os_dep/mlme_linux.c
@@ -159,15 +159,15 @@ void rtw_report_sec_ie(struct adapter *adapter, u8
authmode, u8 *sec_ie)
}
p = buff;
- p += sprintf(p, "ASSOCINFO(ReqIEs =");
+ p += scnprintf(p, IW_CUSTOM_MAX - (p - buff), "ASSOCINFO(ReqIEs
=");
len = sec_ie[1] + 2;
len = (len < IW_CUSTOM_MAX) ? len : IW_CUSTOM_MAX;
for (i = 0; i < len; i++)
- p += sprintf(p, "%02x", sec_ie[i]);
+ p += scnprintf(p, IW_CUSTOM_MAX - (p - buff), "%02x",
sec_ie[i]);
- p += sprintf(p, ")");
+ p += scnprintf(p, IW_CUSTOM_MAX - (p - buff), ")");
memset(&wrqu, 0, sizeof(wrqu));
--
2.30.1
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