From: Xi Wang <xi.wang@gmail.com>
Date: Thu, 9 Feb 2012 01:13:37 +0000 (-0800)
Subject: nilfs2: avoid overflowing segment numbers in nilfs_ioctl_clean_segments()
X-Git-Tag: v3.3-rc3~5^2~4
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=1ecd3c7ea76488c63b4b0a2561fd7eaf96cc8028;p=pandora-kernel.git

nilfs2: avoid overflowing segment numbers in nilfs_ioctl_clean_segments()

nsegs is read from userspace.  Limit its value and avoid overflowing nsegs
* sizeof(__u64) in the subsequent call to memdup_user().

This patch complements 481fe17e973fb9 ("nilfs2: potential integer overflow
in nilfs_ioctl_clean_segments()").

Signed-off-by: Xi Wang <xi.wang@gmail.com>
Cc: Haogang Chen <haogangchen@gmail.com>
Acked-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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