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https://github.com/Divested-Mobile/DivestOS-Build.git
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70 lines
2.2 KiB
Diff
70 lines
2.2 KiB
Diff
From e55ddf68568a33288d76f5e00c93f8157cb9a632 Mon Sep 17 00:00:00 2001
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From: Sudhir Kohalli <sudhir.kohalli@broadcom.com>
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Date: Fri, 27 Jan 2017 17:14:19 -0800
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Subject: [PATCH] net: wireless: bcmdhd: Fix for arbitrary memory free.
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Fix for arbitrary memory free in nexus6p's wifi driver
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function wl_cfgvendor_dbg_get_mem_dump. Current fix
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includes intialize mem_buf to NULL and check if the
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len is valid or not. Also check if buf_len is valid
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or not. If buf_len is not valid then mem_buf will be
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set to NULL.
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Signed-off-by: Sudhir Kohalli <sudhir.kohalli@broadcom.com>
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Change-Id: Ia98ce18f0437d38d6f6d77033af7477ae12574e3
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Bug: 34624457
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---
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drivers/net/wireless/bcmdhd/wl_cfgvendor.c | 29 ++++++++++++++++++++++++++---
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1 file changed, 26 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 9a73de20f1298..1f5152f66ab36 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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@@ -2283,7 +2283,7 @@ static int wl_cfgvendor_dbg_get_mem_dump(struct wiphy *wiphy,
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int buf_len = 0;
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void __user *user_buf = NULL;
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const struct nlattr *iter;
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- char *mem_buf;
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+ char *mem_buf = NULL;
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struct sk_buff *skb;
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struct bcm_cfg80211 *cfg = wiphy_priv(wiphy);
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@@ -2291,10 +2291,33 @@ static int wl_cfgvendor_dbg_get_mem_dump(struct wiphy *wiphy,
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type = nla_type(iter);
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switch (type) {
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case DEBUG_ATTRIBUTE_FW_DUMP_LEN:
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- buf_len = nla_get_u32(iter);
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+ /* Check if the iter is valid and
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+ * buffer length is not already initialized.
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+ */
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+ if ((nla_len(iter) == sizeof(uint32)) &&
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+ !buf_len) {
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+ buf_len = nla_get_u32(iter);
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+ if (buf_len <= 0) {
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+ ret = BCME_ERROR;
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+ goto exit;
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+ }
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+ } else {
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+ ret = BCME_ERROR;
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+ goto exit;
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+ }
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break;
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case DEBUG_ATTRIBUTE_FW_DUMP_DATA:
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- user_buf = (void __user *)(unsigned long) nla_get_u64(iter);
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+ if (nla_len(iter) != sizeof(uint64)) {
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+ WL_ERR(("Invalid len\n"));
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+ ret = BCME_ERROR;
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+ goto exit;
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+ }
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+ user_buf =
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+ (void __user *)(unsigned long)nla_get_u64(iter);
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+ if (!user_buf) {
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+ ret = BCME_ERROR;
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+ goto exit;
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+ }
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break;
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default:
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WL_ERR(("Unknown type: %d\n", type));
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