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XArray: Fix xa_erase of 2-byte aligned entries

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xas_store() was interpreting the entry it found in the array as a node
entry if the bottom two bits had value 2.  That's only true if either
the entry is in the root node or in a non-leaf node.

Signed-off-by: Matthew Wilcox <willy@infradead.org>
This commit is contained in:
Matthew Wilcox
2019-02-21 17:36:45 -05:00
parent 962033d55d
commit 2fbe967b3e
2 changed files with 16 additions and 2 deletions
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2
lib/xarray.c
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@@ -800,7 +800,7 @@ void *xas_store(struct xa_state *xas, void *entry)
* entry is set to NULL.
*/
rcu_assign_pointer(*slot, entry);
if (xa_is_node(next))
if (xa_is_node(next) && (!node || node->shift))
xas_free_nodes(xas, xa_to_node(next));
if (!node)
break;