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Fix an error that can cause attempted reading beyond the end of file.

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This commit is contained in:
John Dyson 1995-09-11 00:46:19 +00:00
parent ccbb2f7226
commit b1fc01b7da
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=10669
1 changed files with 11 additions and 3 deletions
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14
sys/vm/vnode_pager.c
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@ -38,7 +38,7 @@
* SUCH DAMAGE.
*
* from: @(#)vnode_pager.c 7.5 (Berkeley) 4/20/91
* $Id: vnode_pager.c,v 1.46 1995/09/04 04:44:25 dyson Exp $
* $Id: vnode_pager.c,v 1.47 1995/09/06 05:37:41 dyson Exp $
*/
/*
@ -215,8 +215,13 @@ vnode_pager_haspage(object, offset, before, after)
*before += poff;
}
if (after) {
int numafter;
*after *= pagesperblock;
*after += (pagesperblock - (poff + 1));
numafter = pagesperblock - (poff + 1);
if (offset + numafter * PAGE_SIZE > object->un_pager.vnp.vnp_size) {
numafter = (object->un_pager.vnp.vnp_size - offset)/PAGE_SIZE;
}
*after += numafter;
}
return TRUE;
}
@ -463,12 +468,13 @@ vnode_pager_input_smlfs(object, m)
vm_page_set_validclean(m, (i * bsize) & (PAGE_SIZE-1), bsize);
} else {
vm_page_set_clean(m, (i * bsize) & (PAGE_SIZE-1), bsize);
vm_page_set_validclean(m, (i * bsize) & (PAGE_SIZE-1), bsize);
bzero((caddr_t) kva + i * bsize, bsize);
}
}
vm_pager_unmap_page(kva);
pmap_clear_modify(VM_PAGE_TO_PHYS(m));
m->flags &= ~PG_ZERO;
if (error) {
return VM_PAGER_ERROR;
}
@ -532,6 +538,7 @@ vnode_pager_input_old(object, m)
}
pmap_clear_modify(VM_PAGE_TO_PHYS(m));
m->dirty = 0;
m->flags &= ~PG_ZERO;
return error ? VM_PAGER_ERROR : VM_PAGER_OK;
}
@ -747,6 +754,7 @@ vnode_pager_leaf_getpages(object, m, count, reqpage)
pmap_clear_modify(VM_PAGE_TO_PHYS(m[i]));
m[i]->dirty = 0;
m[i]->valid = VM_PAGE_BITS_ALL;
m[i]->flags &= ~PG_ZERO;
if (i != reqpage) {
/*