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radix-tree: fix deleting a multi-order entry through an alias

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If we deleted an entry through an index which looked up a sibling
pointer, we'd end up zeroing out the wrong slots in the node.  Use
get_slot_offset() to find the right slot.

Signed-off-by: Matthew Wilcox <[email protected]>
Reviewed-by: Ross Zwisler <[email protected]>
Cc: Konstantin Khlebnikov <[email protected]>
Cc: Kirill Shutemov <[email protected]>
Cc: Jan Kara <[email protected]>
Cc: Neil Brown <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Matthew Wilcox 2016-05-20 17:02:02 -07:00 • committed by Linus Torvalds
commit 29e0967c2f
1 changed files with 1 additions and 1 deletions
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2
lib/radix-tree.c
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@ -1558,7 +1558,7 @@ void *radix_tree_delete_item(struct radix_tree_root *root,
return entry;
}
offset = index & RADIX_TREE_MAP_MASK;
offset = get_slot_offset(node, slot);
/*
* Clear all tags associated with the item to be deleted.