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Fixed arg checking in if_advlock(). Invalid args were accepted in an

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optimized case.  Preposterous lengths weren't checked for.

Found by:	NIST-PCTS
This commit is contained in:
Bruce Evans 1996-12-19 13:22:30 +00:00
parent 0181a94ac9
commit a88bd8aae4
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=20676
1 changed files with 14 additions and 11 deletions
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25
sys/kern/kern_lockf.c
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@ -34,7 +34,7 @@
* SUCH DAMAGE.
*
* @(#)ufs_lockf.c 8.3 (Berkeley) 1/6/94
* $Id: kern_lockf.c,v 1.5 1995/12/14 08:31:26 phk Exp $
* $Id: kern_lockf.c,v 1.6 1996/09/03 14:21:52 bde Exp $
*/
#include <sys/param.h>
@ -92,15 +92,6 @@ lf_advlock(ap, head, size)
off_t start, end;
int error;
/*
* Avoid the common case of unlocking when inode has no locks.
*/
if (*head == (struct lockf *)0) {
if (ap->a_op != F_SETLK) {
fl->l_type = F_UNLCK;
return (0);
}
}
/*
* Convert the flock structure into a start and end.
*/
@ -126,8 +117,20 @@ lf_advlock(ap, head, size)
return (EINVAL);
if (fl->l_len == 0)
end = -1;
else
else {
end = start + fl->l_len - 1;
if (end < start)
return (EINVAL);
}
/*
* Avoid the common case of unlocking when inode has no locks.
*/
if (*head == (struct lockf *)0) {
if (ap->a_op != F_SETLK) {
fl->l_type = F_UNLCK;
return (0);
}
}
/*
* Create the lockf structure
*/