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mwifiex: fix use-after-free in beacon_ie processing 

beacon_ie buffer is allocated in mwifiex_fill_new_bss_desc()
and the buffer pointer is saved in bss_desc->beacon_buf.
beacon_ie is freed before the function returns. However,
bss_desc->beacon_buf is still being accessed afterwards.

Fix it by freeing beacon_ie (bss_desc->beacon_buf) in
caller's scope.

Reviewed-by: Doug Anderson <dianders@chromium.org>
Reviewed-by: Paul Stewart <pstew@chromium.org>
Signed-off-by: Bing Zhao <bzhao@marvell.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Bing Zhao 2013-04-12 10:34:17 -07:00 committed by John W. Linville
parent 8bc77a4d2c
commit d837a2ae40
2 changed files with 17 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
drivers/net/wireless/mwifiex/scan.c
View File

@ -1533,10 +1533,18 @@ static int mwifiex_update_curr_bss_params(struct mwifiex_private *priv,
/* Make a copy of current BSSID descriptor */
memcpy(&priv->curr_bss_params.bss_descriptor, bss_desc,
sizeof(priv->curr_bss_params.bss_descriptor));
/* The contents of beacon_ie will be copied to its own buffer
* in mwifiex_save_curr_bcn()
*/
mwifiex_save_curr_bcn(priv);
spin_unlock_irqrestore(&priv->curr_bcn_buf_lock, flags);
done:
/* beacon_ie buffer was allocated in function
* mwifiex_fill_new_bss_desc(). Free it now.
*/
kfree(bss_desc->beacon_buf);
kfree(bss_desc);
return 0;
}

14
drivers/net/wireless/mwifiex/sta_ioctl.c
View File

@ -140,12 +140,13 @@ int mwifiex_request_set_multicast_list(struct mwifiex_private *priv,
/*
* This function fills bss descriptor structure using provided
* information.
* beacon_ie buffer is allocated in this function. It is caller's
* responsibility to free the memory.
*/
int mwifiex_fill_new_bss_desc(struct mwifiex_private *priv,
struct cfg80211_bss *bss,
struct mwifiex_bssdescriptor *bss_desc)
{
int ret;
u8 *beacon_ie;
size_t beacon_ie_len;
struct mwifiex_bss_priv *bss_priv = (void *)bss->priv;
@ -165,6 +166,7 @@ int mwifiex_fill_new_bss_desc(struct mwifiex_private *priv,
memcpy(bss_desc->mac_address, bss->bssid, ETH_ALEN);
bss_desc->rssi = bss->signal;
/* The caller of this function will free beacon_ie */
bss_desc->beacon_buf = beacon_ie;
bss_desc->beacon_buf_size = beacon_ie_len;
bss_desc->beacon_period = bss->beacon_interval;
@ -182,10 +184,7 @@ int mwifiex_fill_new_bss_desc(struct mwifiex_private *priv,
else
bss_desc->bss_mode = NL80211_IFTYPE_STATION;
ret = mwifiex_update_bss_desc_with_ie(priv->adapter, bss_desc);
kfree(beacon_ie);
return ret;
return mwifiex_update_bss_desc_with_ie(priv->adapter, bss_desc);
}
static int mwifiex_process_country_ie(struct mwifiex_private *priv,
@ -349,6 +348,11 @@ int mwifiex_bss_start(struct mwifiex_private *priv, struct cfg80211_bss *bss,
}
done:
/* beacon_ie buffer was allocated in function
* mwifiex_fill_new_bss_desc(). Free it now.
*/
if (bss_desc)
kfree(bss_desc->beacon_buf);
kfree(bss_desc);
return ret;
}