From: Sasha Levin <sasha.levin@oracle.com>
To: tj@kernel.org
Cc: akpm@linux-foundation.org, linux-kernel@vger.kernel.org,
Sasha Levin <sasha.levin@oracle.com>
Subject: [PATCH] idr: prevent NULL deref on lookups before insertions
Date: Wed, 20 Feb 2013 13:44:13 -0500 [thread overview]
Message-ID: <1361385853-29010-1-git-send-email-sasha.levin@oracle.com> (raw)
'hint' will be NULL if we're looking up before adding anything
to the IDR.
Signed-off-by: Sasha Levin <sasha.levin@oracle.com>
---
include/linux/idr.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/include/linux/idr.h b/include/linux/idr.h
index aed2a0c..a6f38b5 100644
--- a/include/linux/idr.h
+++ b/include/linux/idr.h
@@ -113,7 +113,7 @@ static inline void *idr_find(struct idr *idr, int id)
{
struct idr_layer *hint = rcu_dereference_raw(idr->hint);
- if ((id & ~IDR_MASK) == hint->prefix)
+ if (hint && (id & ~IDR_MASK) == hint->prefix)
return rcu_dereference_raw(hint->ary[id & IDR_MASK]);
return idr_find_slowpath(idr, id);
--
1.8.1.2
next reply other threads:[~2013-02-20 18:44 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-02-20 18:44 Sasha Levin [this message]
2013-02-20 18:45 ` Tejun Heo
2013-02-20 19:23 ` Sasha Levin
2013-02-20 21:01 ` [PATCH] posix-timer: don't call idr_find() w/ negative ID Tejun Heo
2013-02-20 21:23 ` Andrew Morton
2013-02-20 21:37 ` Tejun Heo
2013-02-20 22:05 ` Andrew Morton
2013-02-20 22:08 ` Tejun Heo
2013-02-20 22:40 ` [PATCH] posix-timer: don't call idr_find() w/ out-of-range ID Tejun Heo
2013-02-20 23:01 ` Thomas Gleixner
2013-02-20 23:07 ` Tejun Heo
2013-02-20 23:11 ` Thomas Gleixner
2013-02-20 23:24 ` [PATCH UPDATED] " Tejun Heo
2013-02-20 23:35 ` [PATCH] idr: explain WARN_ON_ONCE() on negative IDs " Tejun Heo
2013-02-21 9:10 ` Thomas Gleixner
2013-02-21 16:38 ` [tip:timers/urgent] posix-timer: Don't call idr_find() with " tip-bot for Tejun Heo
2013-02-20 22:10 ` [PATCH] posix-timer: don't call idr_find() w/ negative ID Sasha Levin
2013-02-20 22:12 ` Tejun Heo
2013-02-20 22:15 ` Sasha Levin
2013-02-20 22:20 ` Tejun Heo
2013-02-20 23:09 ` Thomas Gleixner
2013-02-20 21:32 ` Sasha Levin
2013-02-20 21:38 ` Thomas Gleixner
2013-02-20 21:43 ` Tejun Heo
2013-02-20 21:47 ` Thomas Gleixner
2013-02-20 21:50 ` Tejun Heo
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=1361385853-29010-1-git-send-email-sasha.levin@oracle.com \
--to=sasha.levin@oracle.com \
--cc=akpm@linux-foundation.org \
--cc=linux-kernel@vger.kernel.org \
--cc=tj@kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox
all inboxes | Powered by JetHome®