The "exc->key_len" is a u16 that comes from the user. If it's over
IW_ENCODING_TOKEN_MAX (64) that could lead to memory corruption.
Fixes: b121d84882b9 ("staging: ks7010: simplify calls to memcpy()")
Signed-off-by: Zhang Shurong <zhang_shurong@xxxxxxxxxxx>
---
drivers/staging/ks7010/ks_wlan_net.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/drivers/staging/ks7010/ks_wlan_net.c b/drivers/staging/ks7010/ks_wlan_net.c
index e03c87f0bfe7..0fb97a79ad0b 100644
--- a/drivers/staging/ks7010/ks_wlan_net.c
+++ b/drivers/staging/ks7010/ks_wlan_net.c
@@ -1583,8 +1583,10 @@ static int ks_wlan_set_encode_ext(struct net_device *dev,
commit |= SME_WEP_FLAG;
}
if (enc->key_len) {
- memcpy(&key->key_val[0], &enc->key[0], enc->key_len);
- key->key_len = enc->key_len;
+ int key_len = clamp_val(enc->key_len, 0, IW_ENCODING_TOKEN_MAX);
+
+ memcpy(&key->key_val[0], &enc->key[0], key_len);
+ key->key_len = key_len;
commit |= (SME_WEP_VAL1 << index);
}
break;
--
2.30.2
