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76 lines
3.1 KiB
Diff
76 lines
3.1 KiB
Diff
From 0160130f4217c782a7857588f668ab54fae21f58 Mon Sep 17 00:00:00 2001
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From: Srinivas Girigowda <sgirigow@codeaurora.org>
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Date: Wed, 9 Nov 2016 13:55:37 -0800
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Subject: [PATCH] qcacld-2.0: Avoid overflow of EXTSCAN bucket list
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Currently when processing an EXTSCAN vendor command the "num buckets"
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attribute is limit checked and if it exceeds a MAX value then a
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warning message is issued. But beyond that the "num buckets" attribute
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is not used. Instead when the buckets are actually parsed the number
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of buckets is calculated dynamically based upon the number of
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attributes present in the request. Unfortunately when the bucket
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attributes are parsed there is no check to make sure the number of
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buckets processed does not exceed the MAX value, and as a result a
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buffer overflow can occur. Address this issue by aborting the bucket
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parsing once the expected number of records have been parsed.
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Change-Id: Ic260dd65dc99118afbb8042d102acb5b26d1e123
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CRs-Fixed: 1087797
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Bug: 32451104
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Signed-off-by: Srinivas Girigowda <sgirigow@codeaurora.org>
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---
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drivers/staging/qcacld-2.0/CORE/HDD/src/wlan_hdd_cfg80211.c | 13 ++++++++++++-
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1 file changed, 12 insertions(+), 1 deletion(-)
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diff --git a/drivers/staging/qcacld-2.0/CORE/HDD/src/wlan_hdd_cfg80211.c b/drivers/staging/qcacld-2.0/CORE/HDD/src/wlan_hdd_cfg80211.c
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index a22714874062e..e628b575350e4 100644
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--- a/drivers/staging/qcacld-2.0/CORE/HDD/src/wlan_hdd_cfg80211.c
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+++ b/drivers/staging/qcacld-2.0/CORE/HDD/src/wlan_hdd_cfg80211.c
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@@ -3525,6 +3525,7 @@ static int hdd_extscan_start_fill_bucket_channel_spec(
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int rem1, rem2;
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eHalStatus status;
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uint8_t bktIndex, j, numChannels, total_channels = 0;
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+ uint32_t expected_buckets;
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uint32_t chanList[WNI_CFG_VALID_CHANNEL_LIST_LEN] = {0};
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uint32_t min_dwell_time_active_bucket =
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@@ -3536,7 +3537,6 @@ static int hdd_extscan_start_fill_bucket_channel_spec(
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uint32_t max_dwell_time_passive_bucket =
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pHddCtx->cfg_ini->extscan_passive_max_chn_time;
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- bktIndex = 0;
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pReqMsg->min_dwell_time_active =
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pReqMsg->max_dwell_time_active =
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pHddCtx->cfg_ini->extscan_active_max_chn_time;
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@@ -3544,10 +3544,19 @@ static int hdd_extscan_start_fill_bucket_channel_spec(
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pReqMsg->min_dwell_time_passive =
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pReqMsg->max_dwell_time_passive =
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pHddCtx->cfg_ini->extscan_passive_max_chn_time;
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+
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+ expected_buckets = pReqMsg->numBuckets;
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pReqMsg->numBuckets = 0;
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+ bktIndex = 0;
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nla_for_each_nested(buckets,
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tb[QCA_WLAN_VENDOR_ATTR_EXTSCAN_BUCKET_SPEC], rem1) {
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+
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+ if (bktIndex >= expected_buckets) {
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+ hddLog(LOGW, FL("ignoring excess buckets"));
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+ break;
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+ }
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+
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if (nla_parse(bucket,
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QCA_WLAN_VENDOR_ATTR_EXTSCAN_SUBCMD_CONFIG_PARAM_MAX,
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nla_data(buckets), nla_len(buckets), NULL)) {
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@@ -4058,8 +4067,10 @@ static int __wlan_hdd_cfg80211_extscan_start(struct wiphy *wiphy,
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hddLog(LOGW,
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FL("Exceeded MAX number of buckets: %d"),
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WLAN_EXTSCAN_MAX_BUCKETS);
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+ num_buckets = WLAN_EXTSCAN_MAX_BUCKETS;
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}
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hddLog(LOG1, FL("Input: Number of Buckets %d"), num_buckets);
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+ pReqMsg->numBuckets = num_buckets;
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/* This is optional attribute, if not present set it to 0 */
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if (!tb[PARAM_CONFIG_FLAGS])
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