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xen/privcmd: Fix mmap batch ioctl error status copy back.

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Copy back of per-slot error codes is only necessary for V2. V1 does not provide
an error array, so copyback will unconditionally set the global rc to EFAULT.
Only copyback for V2.

Signed-off-by: Andres Lagar-Cavilla <andres@lagarcavilla.org>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
This commit is contained in:
Andres Lagar-Cavilla 2012-09-06 13:24:39 -04:00 committed by Konrad Rzeszutek Wilk
parent ceb90fa0a8
commit 1714df7f2c
1 changed files with 1 additions and 1 deletions
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2
drivers/xen/privcmd.c
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@ -389,7 +389,7 @@ static long privcmd_ioctl_mmap_batch(void __user *udata, int version)
state.err = err_array;
ret = traverse_pages(m.num, sizeof(xen_pfn_t),
&pagelist, mmap_return_errors_v1, &state);
} else
} else if (version == 2)
ret = __copy_to_user(m.err, err_array, m.num * sizeof(int));
/* If we have not had any EFAULT-like global errors then set the global