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Handle zero length in copyout_unmap().

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Submitted by:	John Wehle <john feith com>
MFC after:	2 weeks
This commit is contained in:
Konstantin Belousov 2011-03-28 13:21:26 +00:00
parent 0f502d1c4e
commit 937060a843
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=220101
1 changed files with 3 additions and 0 deletions
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3
sys/kern/subr_uio.c
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@ -498,6 +498,9 @@ copyout_unmap(struct thread *td, vm_offset_t addr, size_t sz)
vm_map_t map;
vm_size_t size;
if (sz == 0)
return (0);
map = &td->td_proc->p_vmspace->vm_map;
size = (vm_size_t) round_page(sz);