| Message ID | 20210419145842.345787-1-leegib@gmail.com |
|---|---|
| State | New |
| Headers | show |
| Series | [v2] qtnfmac: Fix possible buffer overflow in qtnf_event_handle_external_auth | expand |
Lee Gibson <leegib@gmail.com> wrote: > 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> Patch applied to wireless-drivers-next.git, thanks. 130f634da1af qtnfmac: Fix possible buffer overflow in qtnf_event_handle_external_auth -- https://patchwork.kernel.org/project/linux-wireless/patch/20210419145842.345787-1-leegib@gmail.com/ https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches
diff --git a/drivers/net/wireless/quantenna/qtnfmac/event.c b/drivers/net/wireless/quantenna/qtnfmac/event.c index c775c177933b..8dc80574d08d 100644 --- a/drivers/net/wireless/quantenna/qtnfmac/event.c +++ b/drivers/net/wireless/quantenna/qtnfmac/event.c @@ -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);
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> --- v2: use clamp_val() instead of min_t() drivers/net/wireless/quantenna/qtnfmac/event.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-)