From: Zhang Shurong zhang_shurong@foxmail.com
commit 5f1c7031e044cb2fba82836d55cc235e2ad619dc upstream.
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()") Cc: stable stable@kernel.org Signed-off-by: Zhang Shurong zhang_shurong@foxmail.com Reviewed-by: Dan Carpenter dan.carpenter@linaro.org Link: https://lore.kernel.org/r/tencent_5153B668C0283CAA15AA518325346E026A09@qq.co... Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/staging/ks7010/ks_wlan_net.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-)
--- 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 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;