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wifi: wilc1000: validate pairwise and authentication suite offsets

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There is no validation of 'offset' which can trigger an out-of-bounds
read when extracting RSN capabilities.

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/20221123153543.8568-2-philipturnbull@github.com
This commit is contained in:
Phil Turnbull 2022-11-23 10:35:40 -05:00 committed by Kalle Valo
parent 2d0b08c157
commit cd21d99e59
1 changed files with 16 additions and 5 deletions
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21
drivers/net/wireless/microchip/wilc1000/hif.c
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@ -482,14 +482,25 @@ void *wilc_parse_join_bss_param(struct cfg80211_bss *bss,
rsn_ie = cfg80211_find_ie(WLAN_EID_RSN, ies->data, ies->len);
if (rsn_ie) {
int rsn_ie_len = sizeof(struct element) + rsn_ie[1];
int offset = 8;
param->mode_802_11i = 2;
param->rsn_found = true;
/* extract RSN capabilities */
offset += (rsn_ie[offset] * 4) + 2;
offset += (rsn_ie[offset] * 4) + 2;
memcpy(param->rsn_cap, &rsn_ie[offset], 2);
if (offset < rsn_ie_len) {
/* skip over pairwise suites */
offset += (rsn_ie[offset] * 4) + 2;
if (offset < rsn_ie_len) {
/* skip over authentication suites */
offset += (rsn_ie[offset] * 4) + 2;
if (offset + 1 < rsn_ie_len) {
param->mode_802_11i = 2;
param->rsn_found = true;
memcpy(param->rsn_cap, &rsn_ie[offset], 2);
}
}
}
}
if (param->rsn_found) {