rtlwifi: aggressive memory leak

[TJ]

Bug #1831751 rtlwifi: aggressive memory leak

https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1831751


Please cherry-pick the upstream fix and backport to 4.18, 4.15 etc.

commit 8cfa272b0d321160ebb5b45073e39ef0a6ad73f2
Author: Larry Finger <Larry.Finger at lwfinger.net>
Date:   Sat Nov 17 20:55:03 2018 -0600

    rtlwifi: Fix leak of skb when processing C2H_BT_INFO

    With commit 0a9f8f0a1ba9 ("rtlwifi: fix btmpinfo timeout while
processing
    C2H_BT_INFO"), calling rtl_c2hcmd_enqueue() with rtl_c2h_fast_cmd()
true,
    the routine returns without freeing that skb, thereby leaking it.

    This issue has been discussed at
https://github.com/lwfinger/rtlwifi_new/issues/401
    and the fix tested there.

    Fixes: 0a9f8f0a1ba9 ("rtlwifi: fix btmpinfo timeout while processing
C2H_BT_INFO")


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