[HARMONY-6639] [classlib][luni]fd's passed c functions needs casting from long to int to avoid potential problems

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Component/s: Classlib
• Environment: All Unix platforms
• Patch Info: Patch Available
• Assignee: Mark Hindess
• Reporter: Mohanraj Loganathan
• Created: 31/Aug/10 09:53
• Updated: 14/Sep/10 05:14
• Resolved: 11/Sep/10 13:55

Description

fd's passed c functions needs casting from long to int to avoid potential problems

Consider the functions below. Here fd is jlong. But both the functions will accept int. So this may cause some potential issues.

mmap(0, (size_t)(size&0x7fffffff), prot, flags, fd-FD_BIAS, (off_t)(alignment&0x7fffffff));
fstat((int)fd - FD_BIAS, &statbuf)

typecasting them to int will avoid the truncation issues.