linux-kernel - [BUG] net: xfrm: possible null-pointer dereferences in xfrm

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-ID: <464bb93d-75b2-c21b-ee32-25a10ff61622@gmail.com>
Date:   Mon, 29 Jul 2019 11:43:49 +0800
From:   Jia-Ju Bai <baijiaju1990@...il.com>
To:     steffen.klassert@...unet.com, herbert@...dor.apana.org.au,
        davem@...emloft.net
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [BUG] net: xfrm: possible null-pointer dereferences in xfrm_policy()

In xfrm_policy(), the while loop on lines 3802-3830 ends when dst->xfrm 
is NULL.
Then, dst->xfrm is used on line 3840:
     xfrm_state_mtu(dst->xfrm, mtu);
         if (x->km.state != XFRM_STATE_VALID...)
         aead = x->data;

Thus, possible null-pointer dereferences may occur.

These bugs are found by a static analysis tool STCheck written by us.

I do not know how to correctly fix these bugs, so I only report them.

Best wishes,
Jia-Ju Bai