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wifi: wilc1000: validate length of IEEE80211_P2P_ATTR_OPER_CHANNEL attribute

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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
This commit is contained in:
Phil Turnbull 2022-11-23 10:35:41 -05:00 • committed by Kalle Valo
parent cd21d99e59
commit 051ae669e4
1 changed files with 12 additions and 2 deletions
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14
drivers/net/wireless/microchip/wilc1000/cfg80211.c
View file

@ -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) {