The original code had calls to snprintf(p, 7, "wpa_ie=") but that string
is 8 characters (because snprintf() puts a NUL terminator on the end).
So instead of an '=' the what gets written to buf is a NUL terminator
followed by the rest of the string.
And actually the %02x formats are three chars as well when you include
the terminator.
Signed-off-by: Dan Carpenter <error27@xxxxxxxxx>
---
Compile tested only.
diff --git a/drivers/staging/rtl8712/rtl871x_ioctl_linux.c b/drivers/staging/rtl8712/rtl871x_ioctl_linux.c
index 685a7b1..ddd068c 100644
--- a/drivers/staging/rtl8712/rtl871x_ioctl_linux.c
+++ b/drivers/staging/rtl8712/rtl871x_ioctl_linux.c
@@ -280,18 +280,20 @@ static inline char *translate_scan(struct _adapter *padapter,
/* parsing WPA/WPA2 IE */
{
u16 wpa_len = 0, rsn_len = 0;
- u8 *p;
+ int n;
sint out_len = 0;
out_len = r8712_get_sec_ie(pnetwork->network.IEs,
pnetwork->network.
IELength, rsn_ie, &rsn_len,
wpa_ie, &wpa_len);
if (wpa_len > 0) {
- p = buf;
memset(buf, 0, MAX_WPA_IE_LEN);
- p += snprintf(p, 7, "wpa_ie=");
- for (i = 0; i < wpa_len; i++)
- p += snprintf(p, 2, "%02x", wpa_ie[i]);
+ n = sprintf(buf, "wpa_ie=");
+ for (i = 0; i < wpa_len; i++) {
+ n += snprintf(buf + n, MAX_WPA_IE_LEN - n, "%02x", wpa_ie[i]);
+ if (n >= MAX_WPA_IE_LEN)
+ break;
+ }
memset(&iwe, 0, sizeof(iwe));
iwe.cmd = IWEVCUSTOM;
iwe.u.data.length = (u16)strlen(buf);
@@ -304,11 +306,13 @@ static inline char *translate_scan(struct _adapter *padapter,
&iwe, wpa_ie);
}
if (rsn_len > 0) {
- p = buf;
memset(buf, 0, MAX_WPA_IE_LEN);
- p += snprintf(p, 7, "rsn_ie=");
- for (i = 0; i < rsn_len; i++)
- p += snprintf(p, 2, "%02x", rsn_ie[i]);
+ n = sprintf(buf, "rsn_ie=");
+ for (i = 0; i < rsn_len; i++) {
+ n += snprintf(buf + n, MAX_WPA_IE_LEN - n, "%02x", rsn_ie[i]);
+ if (n >= MAX_WPA_IE_LEN)
+ break;
+ }
memset(&iwe, 0, sizeof(iwe));
iwe.cmd = IWEVCUSTOM;
iwe.u.data.length = strlen(buf);
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