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| author | Xi Wang <xi.wang@gmail.com> | 2012-02-09 05:13:37 +0400 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2012-02-09 07:03:51 +0400 |
| commit | 1ecd3c7ea76488c63b4b0a2561fd7eaf96cc8028 (patch) | |
| tree | 3bc88fd0b4fd61c86141c66e86cf5492753bcd22 /fs/nilfs2/ioctl.c | |
| parent | 98e96852480566333f6dacd3223f0be15df34d60 (diff) | |
| download | linux-1ecd3c7ea76488c63b4b0a2561fd7eaf96cc8028.tar.xz | |
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>
Diffstat (limited to 'fs/nilfs2/ioctl.c')
| -rw-r--r-- | 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 886649627c3d..2a70fce70c65 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 |