tree 015ac765550296cac1bc9b3eee833d99630a83fa
parent e40152ee1e1c7a63f4777791863215e3faa37a86
author Zhitong Wang <zhitong.wangzt@alibaba-inc.com> 1269298282 +1100
committer Alex Elder <aelder@sgi.com> 1274281087 -0500

xfs: Fix integer overflow in fs/xfs/linux-2.6/xfs_ioctl*.c

The am_hreq.opcount field in the xfs_attrmulti_by_handle() interface
is not bounded correctly. The opcount is used to determine the size
of the buffer required. The size is bounded, but can overflow and so
the size checks may not be sufficient to catch invalid opcounts.
Fix it by catching opcount values that would cause overflows before
calculating the size.

Signed-off-by: Zhitong Wang <zhitong.wangzt@alibaba-inc.com>
Reviewed-by: Dave Chinner <david@fromorbit.com>