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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 481fe17e97 ("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>
This commit is contained in:
Xi Wang 2012-02-08 17:13:37 -08:00 committed by Linus Torvalds
parent 98e9685248
commit 1ecd3c7ea7
1 changed files with 2 additions and 0 deletions
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2
fs/nilfs2/ioctl.c
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@ -603,6 +603,8 @@ static int nilfs_ioctl_clean_segments(struct inode *inode, struct file *filp,
nsegs = argv[4].v_nmembs; nsegs = argv[4].v_nmembs;
if (argv[4].v_size != argsz[4]) if (argv[4].v_size != argsz[4])
goto out; goto out;
if (nsegs > UINT_MAX / sizeof(__u64))
goto out;
/* /*
* argv[4] points to segment numbers this ioctl cleans. We * argv[4] points to segment numbers this ioctl cleans. We