linux-kernel - Multiple NULL deref on alloc

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Message-ID: <CADJ_3a8WFrs5NouXNqS5WYe7rebFP+_A5CheeqAyD_p7DFJJcg@mail.gmail.com>
Date:   Mon, 9 Sep 2019 12:35:05 -0300
From:   Semmle Security Reports <security-reports@...mle.com>
To:     linux-kernel@...r.kernel.org,
        Semmle vulnerability research team - reports 
        <security-reports@...mle.com>
Subject: Multiple NULL deref on alloc_workqueue

There are multiple points in the Linux Kernel where alloc_workqueue is
not getting checked for errors and as a result, a potential NULL
dereference could occur.

I'm attaching a patch for some of them.
There are two cases I left untouched that requires a bit more refactoring:
https://github.com/torvalds/linux/blob/master/drivers/net/wireless/intel/iwlwifi/pcie/trans.c#L3656
https://github.com/torvalds/linux/blob/master/drivers/staging/rtl8723bs/hal/rtl8723b_hal_init.c#L4508

Regards,
Semmle security team

View attachment "patch_nullderef.txt" of type "text/plain" (3397 bytes)