Bug 4204 - BUG: overflow before widen in the bitmap_ip_create() function.
Summary: BUG: overflow before widen in the bitmap_ip_create() function.
Status: NEW
Alias: None
Product: ANCK 4.19 Dev
Classification: ANCK
Component: net (show other bugs) net
Version: 4.19-028.x
Hardware: All Linux
: P3-Medium S3-normal
Target Milestone: ---
Assignee: XuanZhuo
QA Contact: shuming
URL:
Whiteboard:
Keywords:
Depends on:
Blocks:
 
Reported: 2023-02-24 10:13 UTC by ljubomir
Modified: 2023-02-24 10:13 UTC (History)
2 users (show)

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Description ljubomir inspur_group 2023-02-24 10:13:43 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.