From 051ae669e4505abbe05165bebf6be7922de11f41 Mon Sep 17 00:00:00 2001
From: Phil Turnbull <philipturnbull@github.com>
Date: Wed, 23 Nov 2022 10:35:41 -0500
Subject: [PATCH] wifi: wilc1000: validate length of IEEE80211_P2P_ATTR_OPER_CHANNEL attribute
Git-commit: 051ae669e4505abbe05165bebf6be7922de11f41
Patch-mainline: v6.1-rc8
References: git-fixes
Validate that the IEEE80211_P2P_ATTR_OPER_CHANNEL attribute contains
enough space for a 'struct struct wilc_attr_oper_ch'. If the attribute is
too small then it triggers an out-of-bounds write later in the function.
Signed-off-by: Phil Turnbull <philipturnbull@github.com>
Tested-by: Ajay Kathat <ajay.kathat@microchip.com>
Acked-by: Ajay Kathat <ajay.kathat@microchip.com>
Signed-off-by: Kalle Valo <kvalo@kernel.org>
Link: https://lore.kernel.org/r/20221123153543.8568-3-philipturnbull@github.com
Acked-by: Takashi Iwai <tiwai@suse.de>
---
drivers/net/wireless/microchip/wilc1000/cfg80211.c | 14 ++++++++++++--
1 file changed, 12 insertions(+), 2 deletions(-)
diff --git a/drivers/net/wireless/microchip/wilc1000/cfg80211.c b/drivers/net/wireless/microchip/wilc1000/cfg80211.c
index 9bbfff803357..aedf0e8b69b9 100644
--- a/drivers/net/wireless/microchip/wilc1000/cfg80211.c
+++ b/drivers/net/wireless/microchip/wilc1000/cfg80211.c
@@ -959,14 +959,24 @@ static inline void wilc_wfi_cfg_parse_ch_attr(u8 *buf, u32 len, u8 sta_ch)
return;
while (index + sizeof(*e) <= len) {
+ u16 attr_size;
+
e = (struct wilc_attr_entry *)&buf[index];
+ attr_size = le16_to_cpu(e->attr_len);
+
+ if (index + sizeof(*e) + attr_size > len)
+ return;
+
if (e->attr_type == IEEE80211_P2P_ATTR_CHANNEL_LIST)
ch_list_idx = index;
- else if (e->attr_type == IEEE80211_P2P_ATTR_OPER_CHANNEL)
+ else if (e->attr_type == IEEE80211_P2P_ATTR_OPER_CHANNEL &&
+ attr_size == (sizeof(struct wilc_attr_oper_ch) - sizeof(*e)))
op_ch_idx = index;
+
if (ch_list_idx && op_ch_idx)
break;
- index += le16_to_cpu(e->attr_len) + sizeof(*e);
+
+ index += sizeof(*e) + attr_size;
}
if (ch_list_idx) {
--
2.35.3