linux-kernel - [BUG] scsi: pcmcia: nsp_cs: possible null-pointer dereference in nsp_cs

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Message-ID: <688ece87-00f9-7a54-cd58-3c6b9b416cb4@gmail.com>
Date:   Sat, 31 Jul 2021 12:07:54 +0800
From:   Li Tuo <islituo@...il.com>
To:     yokota@...lab.is.tsukuba.ac.jp, jejb@...ux.ibm.com,
        martin.petersen@...cle.com
Cc:     linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
        baijiaju1990@...il.com
Subject: [BUG] scsi: pcmcia: nsp_cs: possible null-pointer dereference in
 nsp_cs_config()

Hello,

Our static analysis tool finds a possible null-pointer dereference in 
the pcmcia driver in Linux 5.14.0-rc3:

The variable link->resource[0] is checked in:
1599:    if (link->resource[0])

This indicates that link->resource[0] can be NULL.
But it is dereferenced in:
1610:    data->BaseAddress = link->resource[0]->start;

I am not quite sure whether this possible null-pointer dereference is 
real and how to fix it if it is real.
Any feedback would be appreciated, thanks!

Reported-by: TOTE Robot <oslab@...nghua.edu.cn>

Best wishes,
Tuo Li