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Reject negative offsets, to prevent panics later in genfs_getpages().

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This commit is contained in:
maxv 2019-08-26 10:19:08 +00:00
parent 2bf4305637
commit aff86c9e3f
1 changed files with 5 additions and 2 deletions
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7
sys/kern/sys_descrip.c
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@ -1,4 +1,4 @@
/* $NetBSD: sys_descrip.c,v 1.33 2019/05/21 18:09:31 christos Exp $ */
/* $NetBSD: sys_descrip.c,v 1.34 2019/08/26 10:19:08 maxv Exp $ */
/*-
* Copyright (c) 2008 The NetBSD Foundation, Inc.
@ -67,7 +67,7 @@
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: sys_descrip.c,v 1.33 2019/05/21 18:09:31 christos Exp $");
__KERNEL_RCSID(0, "$NetBSD: sys_descrip.c,v 1.34 2019/08/26 10:19:08 maxv Exp $");
#include <sys/param.h>
#include <sys/systm.h>
@ -661,6 +661,9 @@ do_posix_fadvise(int fd, off_t offset, off_t len, int advice)
CTASSERT(POSIX_FADV_RANDOM == UVM_ADV_RANDOM);
CTASSERT(POSIX_FADV_SEQUENTIAL == UVM_ADV_SEQUENTIAL);
if (offset < 0) {
return EINVAL;
}
if (len == 0) {
endoffset = INT64_MAX;
} else if (len > 0 && (INT64_MAX - offset) >= len) {