From b4d8ad7fd3a18e6d92d4ebe858185c704604a57d Mon Sep 17 00:00:00 2001 From: "Darrick J. Wong" Date: Fri, 22 Dec 2017 13:14:34 -0800 Subject: xfs: fix s_maxbytes overflow problems Fix some integer overflow problems if offset + count happen to be large enough to cause an integer overflow. Signed-off-by: Darrick J. Wong Reviewed-by: Christoph Hellwig --- fs/xfs/xfs_iomap.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'fs/xfs/xfs_iomap.c') diff --git a/fs/xfs/xfs_iomap.c b/fs/xfs/xfs_iomap.c index 7ab52a8bc0a9..66e1edbfb2b2 100644 --- a/fs/xfs/xfs_iomap.c +++ b/fs/xfs/xfs_iomap.c @@ -1006,7 +1006,7 @@ xfs_file_iomap_begin( } ASSERT(offset <= mp->m_super->s_maxbytes); - if ((xfs_fsize_t)offset + length > mp->m_super->s_maxbytes) + if (offset > mp->m_super->s_maxbytes - length) length = mp->m_super->s_maxbytes - offset; offset_fsb = XFS_B_TO_FSBT(mp, offset); end_fsb = XFS_B_TO_FSB(mp, offset + length); -- cgit v1.2.3