From: Wen Huang huangwenabc@gmail.com
commit e5e884b42639c74b5b57dc277909915c0aefc8bb upstream.
add_ie_rates() copys rates without checking the length in bss descriptor from remote AP.when victim connects to remote attacker, this may trigger buffer overflow. lbs_ibss_join_existing() copys rates without checking the length in bss descriptor from remote IBSS node.when victim connects to remote attacker, this may trigger buffer overflow. Fix them by putting the length check before performing copy.
This fix addresses CVE-2019-14896 and CVE-2019-14897. This also fix build warning of mixed declarations and code.
Reported-by: kbuild test robot lkp@intel.com Signed-off-by: Wen Huang huangwenabc@gmail.com Signed-off-by: Kalle Valo kvalo@codeaurora.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Signed-off-by: Yang Yingliang yangyingliang@huawei.com --- drivers/net/wireless/marvell/libertas/cfg.c | 16 +++++++++++++--- 1 file changed, 13 insertions(+), 3 deletions(-)
diff --git a/drivers/net/wireless/marvell/libertas/cfg.c b/drivers/net/wireless/marvell/libertas/cfg.c index 57edfad..c9401c1 100644 --- a/drivers/net/wireless/marvell/libertas/cfg.c +++ b/drivers/net/wireless/marvell/libertas/cfg.c @@ -273,6 +273,10 @@ static int lbs_add_supported_rates_tlv(u8 *tlv) int hw, ap, ap_max = ie[1]; u8 hw_rate;
+ if (ap_max > MAX_RATES) { + lbs_deb_assoc("invalid rates\n"); + return tlv; + } /* Advance past IE header */ ie += 2;
@@ -1717,6 +1721,9 @@ static int lbs_ibss_join_existing(struct lbs_private *priv, struct cmd_ds_802_11_ad_hoc_join cmd; u8 preamble = RADIO_PREAMBLE_SHORT; int ret = 0; + int hw, i; + u8 rates_max; + u8 *rates;
/* TODO: set preamble based on scan result */ ret = lbs_set_radio(priv, preamble, 1); @@ -1775,9 +1782,12 @@ static int lbs_ibss_join_existing(struct lbs_private *priv, if (!rates_eid) { lbs_add_rates(cmd.bss.rates); } else { - int hw, i; - u8 rates_max = rates_eid[1]; - u8 *rates = cmd.bss.rates; + rates_max = rates_eid[1]; + if (rates_max > MAX_RATES) { + lbs_deb_join("invalid rates"); + goto out; + } + rates = cmd.bss.rates; for (hw = 0; hw < ARRAY_SIZE(lbs_rates); hw++) { u8 hw_rate = lbs_rates[hw].bitrate / 5; for (i = 0; i < rates_max; i++) {