25 lines
874 B
Diff
25 lines
874 B
Diff
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# Commit 53decd322157e922cac2988e07da6d39538c8033
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# Date 2013-03-01 16:59:49 +0100
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# Author Jan Beulich <jbeulich@suse.com>
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# Committer Jan Beulich <jbeulich@suse.com>
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fix compat memory exchange op splitting
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A shift with a negative count was erroneously used here, yielding
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undefined behavior.
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Reported-by: Xi Wang <xi@mit.edu>
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Signed-off-by: Jan Beulich <jbeulich@suse.com>
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Acked-by: Keir Fraser <keir@xen.org>
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--- a/xen/common/compat/memory.c
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+++ b/xen/common/compat/memory.c
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@@ -172,7 +172,7 @@ int compat_memory_op(unsigned int cmd, X
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if ( order_delta >= 0 )
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nat.xchg->out.nr_extents = end_extent >> order_delta;
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else
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- nat.xchg->out.nr_extents = end_extent << order_delta;
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+ nat.xchg->out.nr_extents = end_extent << -order_delta;
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++split;
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}
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