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Adjust vnode_pager_input_smlfs() to not attempt to BMAP blocks beyond the

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file EOF.  This works around a bug in the ISOFS (CDRom) BMAP code which
returns bogus values for requests beyond the file EOF rather then returning
an error, resulting in either corrupt data being mmap()'d beyond the file EOF
or resulting in a seg-fault on the last page of a mmap()'d file (mmap()s of
CDRom files).

Reported by: peter / Yahoo
MFC after:	3 days
This commit is contained in:
Matthew Dillon 2001-11-05 18:58:47 +00:00
parent 0322b80600
commit 33c6774151
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=86092
1 changed files with 7 additions and 2 deletions
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9
sys/vm/vnode_pager.c
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@ -422,12 +422,17 @@ vnode_pager_input_smlfs(object, m)
kva = vm_pager_map_page(m);
for (i = 0; i < PAGE_SIZE / bsize; i++) {
vm_ooffset_t address;
if (vm_page_bits(i * bsize, bsize) & m->valid)
continue;
fileaddr = vnode_pager_addr(vp,
IDX_TO_OFF(m->pindex) + i * bsize, (int *)0);
address = IDX_TO_OFF(m->pindex) + i * bsize;
if (address >= object->un_pager.vnp.vnp_size) {
fileaddr = -1;
} else {
fileaddr = vnode_pager_addr(vp, address, NULL);
}
if (fileaddr != -1) {
bp = getpbuf(&vnode_pbuf_freecnt);