linux-kernel - [PATCH] iphase: Adding a null pointer check

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Message-Id: <20231107123600.14529-1-shum.sdl@nppct.ru>
Date:   Tue,  7 Nov 2023 15:36:00 +0300
From:   Andrey Shumilin <shum.sdl@...ct.ru>
To:     3chas3@...il.com
Cc:     Andrey Shumilin <shum.sdl@...ct.ru>,
        linux-atm-general@...ts.sourceforge.net, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, lvc-project@...uxtesting.org,
        khoroshilov@...ras.ru, ykarpov@...ras.ru, vmerzlyakov@...ras.ru,
        vefanov@...ras.ru
Subject: [PATCH] iphase: Adding a null pointer check

The pointer <dev->desc_tbl[i].iavcc> is dereferenced on line 195.
Further in the code, it is checked for null on line 204.
It is proposed to add a check before dereferencing the pointer.

Found by Linux Verification Center (linuxtesting.org) with SVACE.

Signed-off-by: Andrey Shumilin <shum.sdl@...ct.ru>
---
 drivers/atm/iphase.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/atm/iphase.c b/drivers/atm/iphase.c
index 324148686953..596422fbfacc 100644
--- a/drivers/atm/iphase.c
+++ b/drivers/atm/iphase.c
@@ -192,6 +192,11 @@ static u16 get_desc (IADEV *dev, struct ia_vcc *iavcc) {
            i++;
            continue;
         }
+       if (!(iavcc_r = dev->desc_tbl[i].iavcc)) {
+	   printk("Fatal err, desc table vcc or skb is NULL\n");
+	   i++;
+	   continue;
+	}
         ltimeout = dev->desc_tbl[i].iavcc->ltimeout; 
         delta = jiffies - dev->desc_tbl[i].timestamp;
         if (delta >= ltimeout) {
-- 
2.30.2