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https://github.com/Divested-Mobile/DivestOS-Build.git
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85 lines
2.9 KiB
Diff
85 lines
2.9 KiB
Diff
From e58dd312d3d28331b2e28674c6a49f815a55d4bc Mon Sep 17 00:00:00 2001
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From: Insun Song <insun.song@broadcom.com>
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Date: Fri, 21 Apr 2017 14:38:21 -0700
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Subject: [PATCH] net: wireless: bcmdhd: adding boundary check in SWC gscan
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config
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Since there's no boundary checking while looping NL structures, it could
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corrupt kernel memory heap and leave room for security vulnerability
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issue.
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The proposed fix is adding a new NL attribute indicating how many SWC
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bssids included. and it bounds NL iteration not to overwrite the
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buffer.
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Signed-off-by: Insun Song <insun.song@broadcom.com>
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Bug: 34973477
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Change-Id: I03e079b6054b930487230ca313bb96a7f9e63e64
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---
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drivers/net/wireless/bcmdhd/wl_cfgvendor.c | 34 +++++++++++++++++++++++++++---
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1 file changed, 31 insertions(+), 3 deletions(-)
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diff --git a/drivers/net/wireless/bcmdhd/wl_cfgvendor.c b/drivers/net/wireless/bcmdhd/wl_cfgvendor.c
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index 1f5152f66ab36..4e5fee09b5f33 100644
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--- a/drivers/net/wireless/bcmdhd/wl_cfgvendor.c
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+++ b/drivers/net/wireless/bcmdhd/wl_cfgvendor.c
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@@ -1168,11 +1168,15 @@ static int wl_cfgvendor_significant_change_cfg(struct wiphy *wiphy,
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const struct nlattr *outer, *inner, *iter;
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bool flush = FALSE;
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wl_pfn_significant_bssid_t *pbssid;
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+ uint16 num_bssid = 0;
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+ uint16 max_buf_size = sizeof(gscan_swc_params_t) +
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+ sizeof(wl_pfn_significant_bssid_t) * (PFN_SWC_MAX_NUM_APS - 1);
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+
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+ significant_params = kzalloc(max_buf_size, GFP_KERNEL);
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- significant_params = (gscan_swc_params_t *) kzalloc(len, GFP_KERNEL);
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if (!significant_params) {
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- WL_ERR(("Cannot Malloc mem to parse config commands size - %d bytes \n", len));
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- return -1;
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+ WL_ERR(("Cannot Malloc mem size:%d\n", len));
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+ return BCME_NOMEM;
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}
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@@ -1192,9 +1196,27 @@ static int wl_cfgvendor_significant_change_cfg(struct wiphy *wiphy,
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case GSCAN_ATTRIBUTE_MIN_BREACHING:
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significant_params->swc_threshold = nla_get_u16(iter);
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break;
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+ case GSCAN_ATTRIBUTE_NUM_BSSID:
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+ num_bssid = nla_get_u16(iter);
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+ if (num_bssid > PFN_SWC_MAX_NUM_APS) {
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+ WL_ERR(("ovar max SWC bssids:%d\n",
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+ num_bssid));
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+ err = BCME_BADARG;
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+ goto exit;
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+ }
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+ break;
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case GSCAN_ATTRIBUTE_SIGNIFICANT_CHANGE_BSSIDS:
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+ if (num_bssid == 0) {
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+ WL_ERR(("num_bssid : 0\n"));
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+ err = BCME_BADARG;
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+ goto exit;
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+ }
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pbssid = significant_params->bssid_elem_list;
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nla_for_each_nested(outer, iter, tmp) {
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+ if (j >= num_bssid) {
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+ j++;
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+ break;
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+ }
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nla_for_each_nested(inner, outer, tmp1) {
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switch (nla_type(inner)) {
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case GSCAN_ATTRIBUTE_BSSID:
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@@ -1217,6 +1239,12 @@ static int wl_cfgvendor_significant_change_cfg(struct wiphy *wiphy,
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break;
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}
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}
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+ if (j != num_bssid) {
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+ WL_ERR(("swc bssids count:%d not matched to num_bssid:%d\n",
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+ j, num_bssid));
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+ err = BCME_BADARG;
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+ goto exit;
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+ }
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significant_params->nbssid = j;
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if (dhd_dev_pno_set_cfg_gscan(bcmcfg_to_prmry_ndev(cfg),
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