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54 lines
1.9 KiB
Diff
54 lines
1.9 KiB
Diff
From 2935fde98001eca0f8dafad827933ce60d44ffba Mon Sep 17 00:00:00 2001
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From: Insun Song <insun.song@broadcom.com>
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Date: Wed, 24 May 2017 09:21:02 -0700
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Subject: net: wireless: bcmdhd: adding boundary check in
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wl_notify_rx_mgmt_frame
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added boundary check for input parameters not to corrupt kernel heap in
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case user injected malformed input
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Signed-off-by: Insun Song <insun.song@broadcom.com>
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Bug: 37306719
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Change-Id: I6dc12e9bcfce8f3b43ecf14bfd6976bf87afeaa5
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---
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drivers/net/wireless/bcmdhd/wl_cfg80211.c | 14 ++++++++++++--
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1 file changed, 12 insertions(+), 2 deletions(-)
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diff --git a/drivers/net/wireless/bcmdhd/wl_cfg80211.c b/drivers/net/wireless/bcmdhd/wl_cfg80211.c
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index 842091f..021f69f7 100644
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--- a/drivers/net/wireless/bcmdhd/wl_cfg80211.c
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+++ b/drivers/net/wireless/bcmdhd/wl_cfg80211.c
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@@ -9657,9 +9657,15 @@ wl_notify_rx_mgmt_frame(struct bcm_cfg80211 *cfg, bcm_struct_cfgdev *cfgdev,
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u32 event = ntoh32(e->event_type);
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u8 *mgmt_frame;
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u8 bsscfgidx = e->bsscfgidx;
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- u32 mgmt_frame_len = ntoh32(e->datalen) - sizeof(wl_event_rx_frame_data_t);
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+ u32 mgmt_frame_len = ntoh32(e->datalen);
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u16 channel = ((ntoh16(rxframe->channel) & WL_CHANSPEC_CHAN_MASK));
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+ if (mgmt_frame_len < sizeof(wl_event_rx_frame_data_t)) {
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+ WL_ERR(("wrong datalen:%d\n", mgmt_frame_len));
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+ return -EINVAL;
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+ }
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+ mgmt_frame_len -= sizeof(wl_event_rx_frame_data_t);
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+
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memset(&bssid, 0, ETHER_ADDR_LEN);
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ndev = cfgdev_to_wlc_ndev(cfgdev, cfg);
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@@ -9781,7 +9787,11 @@ wl_notify_rx_mgmt_frame(struct bcm_cfg80211 *cfg, bcm_struct_cfgdev *cfgdev,
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WL_DBG((" Event WLC_E_PROBREQ_MSG received\n"));
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mgmt_frame = (u8 *)(data);
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mgmt_frame_len = ntoh32(e->datalen);
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-
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+ if (mgmt_frame_len < DOT11_MGMT_HDR_LEN) {
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+ WL_ERR(("WLC_E_PROBREQ_MSG - wrong datalen:%d\n",
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+ mgmt_frame_len));
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+ return -EINVAL;
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+ }
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prbreq_ie_len = mgmt_frame_len - DOT11_MGMT_HDR_LEN;
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/* Parse prob_req IEs */
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--
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cgit v1.1
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