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authorMatthew Wilcox (Oracle) <willy@infradead.org>2020-01-17 22:13:21 -0500
committerMatthew Wilcox (Oracle) <willy@infradead.org>2020-01-17 22:33:33 -0500
commitc44aa5e8ab58b5f4cf473970ec784c3333496a2e (patch)
tree1ebdac6c222f65df90b970fa8e6cc160454adfaf /lib
parent19c30f4dd0923ef191f35c652ee4058e91e89056 (diff)
downloadlinux-c44aa5e8ab58b5f4cf473970ec784c3333496a2e.tar.bz2
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
Diffstat (limited to 'lib')
-rw-r--r--lib/test_xarray.c5
-rw-r--r--lib/xarray.c10
2 files changed, 13 insertions, 2 deletions
diff --git a/lib/test_xarray.c b/lib/test_xarray.c
index c8cc97ded0fa..55c14e8c8859 100644
--- a/lib/test_xarray.c
+++ b/lib/test_xarray.c
@@ -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
}
diff --git a/lib/xarray.c b/lib/xarray.c
index 03300a0d6425..1d9fab7db8da 100644
--- a/lib/xarray.c
+++ b/lib/xarray.c
@@ -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;