icheck

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1 total messages Started by ucbvaxmark Sun, 18 May 1980 22:54

#10

Author: ucbvaxmark
Date: Sun, 18 May 1980 22:54

16 lines
832 bytes

>From bill Thu Oct 18 01:41:53 1979
To: v7bugs
Subj: bug in icheck
Cc:  sklower

there is a bug in the icheck program due to the declaration of
	unsigned short s_fsize
in <filsys.h>... in the places where XXX.s_fsize is used in comparisons
in icheck.c, it should be cast to an integer.  comparisons of the form
	if (YYY < XXX.s_fsize)
are deadly, since YYY may be negative.  since XXX.s_fsize is positive,
but signed, YYY is treated as unsigned, and havoc results from the fact
that the comparsion fails.   if an inode has a (bad) negative block
number in it (YYY < 0) then icheck will (hopefully) core dump or screw
up in some other way.
	bill

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