xfs: ubsan fixes

Fix some complaints from the UBSAN about signed integer addition overflows.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Brian Foster <bfoster@redhat.com>

diff --git a/fs/xfs/xfs_aops.c b/fs/xfs/xfs_aops.c
index a3eeaba..b0cccf8 100644 (file)
--- a/fs/xfs/xfs_aops.c
+++ b/fs/xfs/xfs_aops.c
@@ -399,7 +399,7 @@ xfs_map_blocks(
               (ip->i_df.if_flags & XFS_IFEXTENTS));
        ASSERT(offset <= mp->m_super->s_maxbytes);
 
-       if (offset + count > mp->m_super->s_maxbytes)
+       if ((xfs_ufsize_t)offset + count > mp->m_super->s_maxbytes)
                count = mp->m_super->s_maxbytes - offset;
        end_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)offset + count);
        offset_fsb = XFS_B_TO_FSBT(mp, offset);
@@ -1265,7 +1265,7 @@ xfs_map_trim_size(
        if (mapping_size > size)
                mapping_size = size;
        if (offset < i_size_read(inode) &&
-           offset + mapping_size >= i_size_read(inode)) {
+           (xfs_ufsize_t)offset + mapping_size >= i_size_read(inode)) {
                /* limit mapping to block that spans EOF */
                mapping_size = roundup_64(i_size_read(inode) - offset,
                                          i_blocksize(inode));
@@ -1312,7 +1312,7 @@ xfs_get_blocks(
        lockmode = xfs_ilock_data_map_shared(ip);
 
        ASSERT(offset <= mp->m_super->s_maxbytes);
-       if (offset + size > mp->m_super->s_maxbytes)
+       if ((xfs_ufsize_t)offset + size > mp->m_super->s_maxbytes)
                size = mp->m_super->s_maxbytes - offset;
        end_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)offset + size);
        offset_fsb = XFS_B_TO_FSBT(mp, offset);