netdev - rtlwifi: Memory leak in rtl92c_set_fw

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Message-ID: <989debc9-8602-0ce3-71a7-2bf783b2c22b@gmx.net>
Date:   Thu, 31 Oct 2019 14:56:36 +0100
From:   Stefan Wahren <wahrenst@....net>
To:     Ping-Ke Shih <pkshih@...ltek.com>,
        Larry Finger <Larry.Finger@...inger.net>
Cc:     colin.king@...onical.com, kvalo@...eaurora.org,
        linux-wireless@...r.kernel.org, netdev@...r.kernel.org
Subject: rtlwifi: Memory leak in rtl92c_set_fw_rsvdpagepkt()

Hi,

i tested the EDIMAX EW-7612 on Raspberry Pi 3B+ with Linux 5.4-rc5
(multi_v7_defconfig + rtlwifi + kmemleak) and noticed a single memory
leak during probe:

unreferenced object 0xec13ee40 (size 176):
  comm "kworker/u8:1", pid 36, jiffies 4294939321 (age 5580.790s)
  hex dump (first 32 bytes):
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
  backtrace:
    [<fc1bbb3e>] __netdev_alloc_skb+0x9c/0x164
    [<863dfa6e>] rtl92c_set_fw_rsvdpagepkt+0x254/0x340 [rtl8192c_common]
    [<9572be0d>] rtl92cu_set_hw_reg+0xf48/0xfa4 [rtl8192cu]
    [<116df4d8>] rtl_op_bss_info_changed+0x234/0x96c [rtlwifi]
    [<8933575f>] ieee80211_bss_info_change_notify+0xb8/0x264 [mac80211]
    [<d4061e86>] ieee80211_assoc_success+0x934/0x1798 [mac80211]
    [<e55adb56>] ieee80211_rx_mgmt_assoc_resp+0x174/0x314 [mac80211]
    [<5974629e>] ieee80211_sta_rx_queued_mgmt+0x3f4/0x7f0 [mac80211]
    [<d91091c6>] ieee80211_iface_work+0x208/0x318 [mac80211]
    [<ac5fcae4>] process_one_work+0x22c/0x564
    [<f5e6d3b6>] worker_thread+0x44/0x5d8
    [<82c7b073>] kthread+0x150/0x154
    [<b43e1b7d>] ret_from_fork+0x14/0x2c
    [<794dff30>] 0x0

It looks like the allocated skd is never freed.

Would be nice to get this fixed.

Regards
Stefan