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>
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 @@
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