From: Xi Wang <xi.wang@gmail.com>
To: KONISHI Ryusuke <konishi.ryusuke@lab.ntt.co.jp>
Cc: linux-nilfs@vger.kernel.org, linux-kernel@vger.kernel.org,
Xi Wang <xi.wang@gmail.com>, Haogang Chen <haogangchen@gmail.com>,
Andrew Morton <akpm@linux-foundation.org>
Subject: [PATCH] nilfs2: avoid overflowing segment numbers in nilfs_ioctl_clean_segments()
Date: Fri, 3 Feb 2012 10:26:07 -0500 [thread overview]
Message-ID: <1328282767-13158-1-git-send-email-xi.wang@gmail.com> (raw)
nsegs is read from userspace. Limit its value and avoid overflowing
nsegs * sizeof(__u64) in the subsequent call to memdup_user().
This patch complements 481fe17e973fb97aa3edf17c69557afe88d8334f.
Signed-off-by: Xi Wang <xi.wang@gmail.com>
Cc: Haogang Chen <haogangchen@gmail.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
---
fs/nilfs2/ioctl.c | 2 ++
1 files changed, 2 insertions(+), 0 deletions(-)
diff --git a/fs/nilfs2/ioctl.c b/fs/nilfs2/ioctl.c
index 8866496..2a70fce 100644
--- a/fs/nilfs2/ioctl.c
+++ b/fs/nilfs2/ioctl.c
@@ -603,6 +603,8 @@ static int nilfs_ioctl_clean_segments(struct inode *inode, struct file *filp,
nsegs = argv[4].v_nmembs;
if (argv[4].v_size != argsz[4])
goto out;
+ if (nsegs > UINT_MAX / sizeof(__u64))
+ goto out;
/*
* argv[4] points to segment numbers this ioctl cleans. We
--
1.7.5.4
next reply other threads:[~2012-02-03 15:28 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-02-03 15:26 Xi Wang [this message]
2012-02-04 3:13 ` Ryusuke Konishi
2012-02-04 4:36 ` Andrew Morton
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