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authorMatthew Wilcox (Oracle) <willy@infradead.org>2020-01-31 14:17:09 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2020-04-17 11:50:18 +0300
commit8f4c8e92bdac564b8c562460a271d3ff11317fe9 (patch)
treeabdeb91c07d0be2feda73142d16879c8fc23e7ca
parenta1ffc47f22a843b75f6d6b9a989abcc825939564 (diff)
downloadlinux-8f4c8e92bdac564b8c562460a271d3ff11317fe9.tar.xz
XArray: Fix xas_pause for large multi-index entries
commit c36d451ad386b34f452fc3c8621ff14b9eaa31a6 upstream. Inspired by the recent Coverity report, I looked for other places where the offset wasn't being converted to an unsigned long before being shifted, and I found one in xas_pause() when the entry being paused is of order >32. Fixes: b803b42823d0 ("xarray: Add XArray iterators") Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org> Cc: stable@vger.kernel.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r--lib/test_xarray.c37
-rw-r--r--lib/xarray.c2
2 files changed, 38 insertions, 1 deletions
diff --git a/lib/test_xarray.c b/lib/test_xarray.c
index 8c7d7a8468b8..d4f97925dbd8 100644
--- a/lib/test_xarray.c
+++ b/lib/test_xarray.c
@@ -1156,6 +1156,42 @@ static noinline void check_find_entry(struct xarray *xa)
XA_BUG_ON(xa, !xa_empty(xa));
}
+static noinline void check_pause(struct xarray *xa)
+{
+ XA_STATE(xas, xa, 0);
+ void *entry;
+ unsigned int order;
+ unsigned long index = 1;
+ unsigned int count = 0;
+
+ for (order = 0; order < order_limit; order++) {
+ XA_BUG_ON(xa, xa_store_order(xa, index, order,
+ xa_mk_index(index), GFP_KERNEL));
+ index += 1UL << order;
+ }
+
+ rcu_read_lock();
+ xas_for_each(&xas, entry, ULONG_MAX) {
+ XA_BUG_ON(xa, entry != xa_mk_index(1UL << count));
+ count++;
+ }
+ rcu_read_unlock();
+ XA_BUG_ON(xa, count != order_limit);
+
+ count = 0;
+ xas_set(&xas, 0);
+ rcu_read_lock();
+ xas_for_each(&xas, entry, ULONG_MAX) {
+ XA_BUG_ON(xa, entry != xa_mk_index(1UL << count));
+ count++;
+ xas_pause(&xas);
+ }
+ rcu_read_unlock();
+ XA_BUG_ON(xa, count != order_limit);
+
+ xa_destroy(xa);
+}
+
static noinline void check_move_tiny(struct xarray *xa)
{
XA_STATE(xas, xa, 0);
@@ -1664,6 +1700,7 @@ static int xarray_checks(void)
check_xa_alloc();
check_find(&array);
check_find_entry(&array);
+ check_pause(&array);
check_account(&array);
check_destroy(&array);
check_move(&array);
diff --git a/lib/xarray.c b/lib/xarray.c
index acd1fad2e862..05324cf571f4 100644
--- a/lib/xarray.c
+++ b/lib/xarray.c
@@ -970,7 +970,7 @@ void xas_pause(struct xa_state *xas)
xas->xa_node = XAS_RESTART;
if (node) {
- unsigned int offset = xas->xa_offset;
+ unsigned long offset = xas->xa_offset;
while (++offset < XA_CHUNK_SIZE) {
if (!xa_is_sibling(xa_entry(xas->xa, node, offset)))
break;