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Fix allocation of multiple pages, which forgot to increase page number.

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Particularly, it caused "vm86_addpage: overlap" panics under VirtualBox.
Add a safety check before freeing memory while I am here.
This commit is contained in:
Jung-uk Kim 2010-08-06 15:04:01 +00:00
parent f6ac23919b
commit f10776734f
1 changed files with 5 additions and 1 deletions
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6
sys/compat/x86bios/x86bios.c
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@ -121,7 +121,7 @@ x86bios_alloc(uint32_t *offset, size_t size, int flags)
*offset = vtophys(addr);
mtx_lock(&x86bios_lock);
for (i = 0; i < howmany(size, PAGE_SIZE); i++)
vm86_addpage(&x86bios_vmc, atop(*offset),
vm86_addpage(&x86bios_vmc, atop(*offset) + i,
addr + i * PAGE_SIZE);
mtx_unlock(&x86bios_lock);
}
@ -142,6 +142,10 @@ x86bios_free(void *addr, size_t size)
sizeof(x86bios_vmc.pmap[i]));
last = i;
}
if (last < 0) {
mtx_unlock(&x86bios_lock);
return;
}
if (last == x86bios_vmc.npages - 1) {
x86bios_vmc.npages -= howmany(size, PAGE_SIZE);
for (i = x86bios_vmc.npages - 1;