Bug 4198 - overflow due to a failure casting operands
Summary: overflow due to a failure casting operands
Status: NEW
Alias: None
Product: ANCK 5.10 Dev
Classification: ANCK
Component: net (show other bugs) net
Version: 5.10.y-15
Hardware: All Linux
: P3-Medium S3-normal
Target Milestone: ---
Assignee: XuanZhuo
QA Contact: shuming
URL:
Whiteboard:
Keywords:
Depends on:
Blocks:
 
Reported: 2023-02-23 19:45 UTC by inspursand
Modified: 2023-02-23 19:45 UTC (History)
2 users (show)

See Also:

Attachments
Add an attachment (proposed patch, testcase, etc.)

Note You need to log in before you can comment on or make changes to this bug.
Description inspursand inspur_group 2023-02-23 19:45:44 UTC 
Description of problem:
When first_ip is 0, last_ip is 0xFFFFFFFF, and netmask is 31, the value of
an arithmetic expression 2 << (netmask - mask_bits - 1) is subject
to overflow due to a failure casting operands to a larger data type
before performing the arithmetic.

Version-Release number of selected component (if applicable):
5.10

How reproducible:


Steps to Reproduce:
1.
2.
3.

Actual results:


Expected results:


Additional info: