linux-kernel - [PATCH 1/6] arch/ia64/kernel: remove null pointer dereference

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]

Date:	Mon, 12 May 2008 15:37:09 +0200 (CEST)
From:	Julia Lawall <julia@...u.dk>
To:	tony.luck@...el.com, linux-ia64@...r.kernel.org,
	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: [PATCH 1/6] arch/ia64/kernel: remove null pointer dereference

From: Julia Lawall <julia@...u.dk>

If data is NULL, it is not possible to access data->ret.

The problem was detected using the following semantic match
(http://www.emn.fr/x-info/coccinelle/)

// <smpl>
@@
expression E, E1;
identifier f;
statement S1,S2,S3;
@@

* if (E == NULL)
{
  ... when != if (E == NULL) S1 else S2
      when != E = E1
* E->f
  ... when any
  return ...;
}
else S3
// </smpl>

Signed-off-by: Julia Lawall <julia@...u.dk>

---

diff -u -p a/arch/ia64/kernel/palinfo.c b/arch/ia64/kernel/palinfo.c
--- a/arch/ia64/kernel/palinfo.c	2008-05-09 16:46:57.000000000 +0200
+++ b/arch/ia64/kernel/palinfo.c	2008-05-12 08:43:35.000000000 +0200
@@ -902,7 +902,6 @@ palinfo_smp_call(void *info)
 	palinfo_smp_data_t *data = (palinfo_smp_data_t *)info;
 	if (data == NULL) {
 		printk(KERN_ERR "palinfo: data pointer is NULL\n");
-		data->ret = 0; /* no output */
 		return;
 	}
 	/* does this actual call */
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/