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qtnfmac: Fix possible buffer overflow in qtnf_event_handle_external_auth

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Function qtnf_event_handle_external_auth calls memcpy without
checking the length.
A user could control that length and trigger a buffer overflow.
Fix by checking the length is within the maximum allowed size.

Signed-off-by: Lee Gibson <leegib@gmail.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Link: https://lore.kernel.org/r/20210419145842.345787-1-leegib@gmail.com
This commit is contained in:
Lee Gibson 2021-04-19 15:58:42 +01:00 committed by Kalle Valo
parent a9a4c080de
commit 130f634da1
1 changed files with 4 additions and 2 deletions
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6
drivers/net/wireless/quantenna/qtnfmac/event.c
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@ -570,8 +570,10 @@ qtnf_event_handle_external_auth(struct qtnf_vif *vif,
return 0;
if (ev->ssid_len) {
memcpy(auth.ssid.ssid, ev->ssid, ev->ssid_len);
auth.ssid.ssid_len = ev->ssid_len;
int len = clamp_val(ev->ssid_len, 0, IEEE80211_MAX_SSID_LEN);
memcpy(auth.ssid.ssid, ev->ssid, len);
auth.ssid.ssid_len = len;
}
auth.key_mgmt_suite = le32_to_cpu(ev->akm_suite);