wlan: Fix buffer overwrite problem in GETROAMMODE
If (len + 1) is greater than priv_data.total_len then copy_to_user
results in writing more data than the buffer can hold.
Fix this by writing mininum of (len + 1) and priv_data.total_len.
CRs-Fixed: 865595
Change-Id: I35e63ec28b6e704e5f8d9b0156de61c3183b5ee6
diff --git a/CORE/HDD/src/wlan_hdd_main.c b/CORE/HDD/src/wlan_hdd_main.c
index 3f7bfcd..fc99199 100755
--- a/CORE/HDD/src/wlan_hdd_main.c
+++ b/CORE/HDD/src/wlan_hdd_main.c
@@ -2666,8 +2666,8 @@
roamMode = CFG_LFR_FEATURE_ENABLED_MIN;
len = scnprintf(extra, sizeof(extra), "%s %d", command, roamMode);
- if (copy_to_user(priv_data.buf, &extra, len + 1))
- {
+ len = VOS_MIN(priv_data.total_len, len + 1);
+ if (copy_to_user(priv_data.buf, &extra, len)) {
VOS_TRACE( VOS_MODULE_ID_HDD, VOS_TRACE_LEVEL_ERROR,
"%s: failed to copy data to user buffer", __func__);
ret = -EFAULT;