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XArray: Fix xas_find returning too many entries 

If you call xas_find() with the initial index > max, it should have
returned NULL but was returning the entry at index.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: stable@vger.kernel.org
This commit is contained in:
Matthew Wilcox (Oracle) 2020-01-17 22:13:21 -05:00
parent 19c30f4dd0
commit c44aa5e8ab
2 changed files with 13 additions and 2 deletions
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5
lib/test_xarray.c
View File

@ -2,6 +2,7 @@
/*
* test_xarray.c: Test the XArray API
* Copyright (c) 2017-2018 Microsoft Corporation
* Copyright (c) 2019-2020 Oracle
* Author: Matthew Wilcox <willy@infradead.org>
*/
@ -911,6 +912,7 @@ static noinline void check_multi_find_1(struct xarray *xa, unsigned order)
xa_store_order(xa, multi, order, xa_mk_value(multi), GFP_KERNEL);
XA_BUG_ON(xa, xa_store_index(xa, next, GFP_KERNEL) != NULL);
XA_BUG_ON(xa, xa_store_index(xa, next + 1, GFP_KERNEL) != NULL);
index = 0;
XA_BUG_ON(xa, xa_find(xa, &index, ULONG_MAX, XA_PRESENT) !=
@ -923,9 +925,12 @@ static noinline void check_multi_find_1(struct xarray *xa, unsigned order)
XA_BUG_ON(xa, xa_find_after(xa, &index, ULONG_MAX, XA_PRESENT) !=
xa_mk_value(next));
XA_BUG_ON(xa, index != next);
XA_BUG_ON(xa, xa_find_after(xa, &index, next, XA_PRESENT) != NULL);
XA_BUG_ON(xa, index != next);
xa_erase_index(xa, multi);
xa_erase_index(xa, next);
xa_erase_index(xa, next + 1);
XA_BUG_ON(xa, !xa_empty(xa));
#endif
}

10
lib/xarray.c
View File

@ -1,7 +1,8 @@
// SPDX-License-Identifier: GPL-2.0+
/*
* XArray implementation
* Copyright (c) 2017 Microsoft Corporation
* Copyright (c) 2017-2018 Microsoft Corporation
* Copyright (c) 2018-2020 Oracle
* Author: Matthew Wilcox <willy@infradead.org>
*/
@ -1083,6 +1084,8 @@ void *xas_find(struct xa_state *xas, unsigned long max)
if (xas_error(xas) || xas->xa_node == XAS_BOUNDS)
return NULL;
if (xas->xa_index > max)
return set_bounds(xas);
if (!xas->xa_node) {
xas->xa_index = 1;
@ -1152,6 +1155,8 @@ void *xas_find_marked(struct xa_state *xas, unsigned long max, xa_mark_t mark)
if (xas_error(xas))
return NULL;
if (xas->xa_index > max)
goto max;
if (!xas->xa_node) {
xas->xa_index = 1;
@ -1869,7 +1874,8 @@ void *xa_find_after(struct xarray *xa, unsigned long *indexp,
entry = xas_find_marked(&xas, max, filter);
else
entry = xas_find(&xas, max);
if (xas.xa_node == XAS_BOUNDS)
if (xas_invalid(&xas))
break;
if (xas_sibling(&xas))
continue;