In the process of searching for matching hardware channels, wreq and
wreq->num_channels are checked to see if they are NULL. However,
if the value of wreq->num_channels is greater than IW_MAX_FREQUENCIES,
an out-of-bounds vulnerability occurs.
Therefore, you must also add code to check whether the value of
wreq->num_channels is within the range.
Reguards.
Signed-by-off: Jeongjun Park <aha310510@xxxxxxxxx>
---
net/wireless/scan.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/net/wireless/scan.c b/net/wireless/scan.c
index 0222ede0feb6..f253dee041d1 100644
--- a/net/wireless/scan.c
+++ b/net/wireless/scan.c
@@ -3460,6 +3460,10 @@ int cfg80211_wext_siwscan(struct net_device *dev,
if (wreq && wreq->num_channels) {
int k;
int wiphy_freq = wiphy->bands[band]->channels[j].center_freq;
+
+ if (wreq->num_channels > IW_MAX_FREQUENCIES)
+ wreq->num_channels = IW_MAX_FREQUENCIES;
+
for (k = 0; k < wreq->num_channels; k++) {
struct iw_freq *freq =
&wreq->channel_list[k];
--
2.34.1
