From: Qing Xu <m1s5p6688@xxxxxxxxx> [ Upstream commit 3a9b153c5591548612c3955c9600a98150c81875 ] mwifiex_ret_wmm_get_status() calls memcpy() without checking the destination size.Since the source is given from remote AP which contains illegal wmm elements , this may trigger a heap buffer overflow. Fix it by putting the length check before calling memcpy(). Signed-off-by: Qing Xu <m1s5p6688@xxxxxxxxx> Signed-off-by: Kalle Valo <kvalo@xxxxxxxxxxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> --- drivers/net/wireless/mwifiex/wmm.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/net/wireless/mwifiex/wmm.c b/drivers/net/wireless/mwifiex/wmm.c index 7015dfab49cfc..3a2ecb6cf1c3d 100644 --- a/drivers/net/wireless/mwifiex/wmm.c +++ b/drivers/net/wireless/mwifiex/wmm.c @@ -978,6 +978,10 @@ int mwifiex_ret_wmm_get_status(struct mwifiex_private *priv, "WMM Parameter Set Count: %d\n", wmm_param_ie->qos_info_bitmap & mask); + if (wmm_param_ie->vend_hdr.len + 2 > + sizeof(struct ieee_types_wmm_parameter)) + break; + memcpy((u8 *) &priv->curr_bss_params.bss_descriptor. wmm_ie, wmm_param_ie, wmm_param_ie->vend_hdr.len + 2); -- 2.20.1
