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| author | kib <kib@FreeBSD.org> | 2011-03-25 16:38:10 +0000 |
|---|---|---|
| committer | kib <kib@FreeBSD.org> | 2011-03-25 16:38:10 +0000 |
| commit | eeb1ebf124d9c1b108ce628aa98d1af7875d3334 (patch) | |
| tree | e32e00ee6351de0257ca9e2cd7d455cb4286c383 /sys/vm/vm_fault.c | |
| parent | 4dc12088a11c128c9cbe74247ccb5b2a1ddb92c8 (diff) | |
| download | FreeBSD-src-eeb1ebf124d9c1b108ce628aa98d1af7875d3334.zip FreeBSD-src-eeb1ebf124d9c1b108ce628aa98d1af7875d3334.tar.gz | |
Handle the corner case in vm_fault_quick_hold_pages().
If supplied length is zero, and user address is invalid, function
might return -1, due to the truncation and rounding of the address.
The callers interpret the situation as EFAULT. Instead of handling
the zero length in caller, filter it in vm_fault_quick_hold_pages().
Sponsored by: The FreeBSD Foundation
Reviewed by: alc
Diffstat (limited to 'sys/vm/vm_fault.c')
| -rw-r--r-- | sys/vm/vm_fault.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/sys/vm/vm_fault.c b/sys/vm/vm_fault.c index 43da602..d417a84 100644 --- a/sys/vm/vm_fault.c +++ b/sys/vm/vm_fault.c @@ -1058,6 +1058,8 @@ vm_fault_quick_hold_pages(vm_map_t map, vm_offset_t addr, vm_size_t len, int count; boolean_t pmap_failed; + if (len == 0) + return (0); end = round_page(addr + len); addr = trunc_page(addr); |
