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Code Issues Releases Wiki Activity

wifi: wfx: fix possible NULL pointer dereference in wfx_set_mfp_ap()

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Since 'ieee80211_beacon_get()' can return NULL, 'wfx_set_mfp_ap()'
should check the return value before examining skb data. So convert
the latter to return an appropriate error code and propagate it to
return from 'wfx_start_ap()' as well. Compile tested only.

Signed-off-by: Dmitry Antipov <dmantipov@yandex.ru>
Tested-by: Jérôme Pouiller <jerome.pouiller@silabs.com>
Acked-by: Jérôme Pouiller <jerome.pouiller@silabs.com>
Signed-off-by: Kalle Valo <kvalo@kernel.org>
Link: https://lore.kernel.org/r/20231204171130.141394-1-dmantipov@yandex.ru
This commit is contained in:
Dmitry Antipov 2023-12-04 20:11:28 +03:00 committed by Kalle Valo
parent 595b1280e2
commit fe0a7776d4
1 changed files with 25 additions and 17 deletions
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42
drivers/net/wireless/silabs/wfx/sta.c
View file

@ -336,29 +336,38 @@ static int wfx_upload_ap_templates(struct wfx_vif *wvif)
return 0;
}
static void wfx_set_mfp_ap(struct wfx_vif *wvif)
static int wfx_set_mfp_ap(struct wfx_vif *wvif)
{
struct ieee80211_vif *vif = wvif_to_vif(wvif);
struct sk_buff *skb = ieee80211_beacon_get(wvif->wdev->hw, vif, 0);
const int ieoffset = offsetof(struct ieee80211_mgmt, u.beacon.variable);
const u16 *ptr = (u16 *)cfg80211_find_ie(WLAN_EID_RSN, skb->data + ieoffset,
skb->len - ieoffset);
const int pairwise_cipher_suite_count_offset = 8 / sizeof(u16);
const int pairwise_cipher_suite_size = 4 / sizeof(u16);
const int akm_suite_size = 4 / sizeof(u16);
const u16 *ptr;
if (ptr) {
ptr += pairwise_cipher_suite_count_offset;
if (WARN_ON(ptr > (u16 *)skb_tail_pointer(skb)))
return;
ptr += 1 + pairwise_cipher_suite_size * *ptr;
if (WARN_ON(ptr > (u16 *)skb_tail_pointer(skb)))
return;
ptr += 1 + akm_suite_size * *ptr;
if (WARN_ON(ptr > (u16 *)skb_tail_pointer(skb)))
return;
wfx_hif_set_mfp(wvif, *ptr & BIT(7), *ptr & BIT(6));
}
if (unlikely(!skb))
return -ENOMEM;
ptr = (u16 *)cfg80211_find_ie(WLAN_EID_RSN, skb->data + ieoffset,
skb->len - ieoffset);
if (unlikely(!ptr))
return -EINVAL;
ptr += pairwise_cipher_suite_count_offset;
if (WARN_ON(ptr > (u16 *)skb_tail_pointer(skb)))
return -EINVAL;
ptr += 1 + pairwise_cipher_suite_size * *ptr;
if (WARN_ON(ptr > (u16 *)skb_tail_pointer(skb)))
return -EINVAL;
ptr += 1 + akm_suite_size * *ptr;
if (WARN_ON(ptr > (u16 *)skb_tail_pointer(skb)))
return -EINVAL;
wfx_hif_set_mfp(wvif, *ptr & BIT(7), *ptr & BIT(6));
return 0;
}
int wfx_start_ap(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
@ -376,8 +385,7 @@ int wfx_start_ap(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
ret = wfx_hif_start(wvif, &vif->bss_conf, wvif->channel);
if (ret > 0)
return -EIO;
wfx_set_mfp_ap(wvif);
return ret;
return wfx_set_mfp_ap(wvif);
}
void wfx_stop_ap(struct ieee80211_hw *hw, struct ieee80211_vif *vif,