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XArray: Fix xa_alloc when id exceeds max 

Specifying a starting ID greater than the maximum ID isn't something
attempted very often, but it should fail.  It was succeeding due to
xas_find_marked() returning the wrong error state, so add tests for
both xa_alloc() and xas_find_marked().

Fixes: b803b42823 ("xarray: Add XArray iterators")
Signed-off-by: Matthew Wilcox <willy@infradead.org>
hifive-unleashed-5.1
Matthew Wilcox 2018-12-13 13:57:42 -05:00
parent 4f145cd66a
commit 48483614de
2 changed files with 36 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

33
lib/test_xarray.c
View File

@ -633,6 +633,15 @@ static noinline void check_xa_alloc(void)
GFP_KERNEL) != -ENOSPC);
XA_BUG_ON(&xa0, id != 0xffffffffU);
xa_destroy(&xa0);
id = 10;
XA_BUG_ON(&xa0, xa_alloc(&xa0, &id, 5, xa_mk_index(id),
GFP_KERNEL) != -ENOSPC);
XA_BUG_ON(&xa0, xa_store_index(&xa0, 3, GFP_KERNEL) != 0);
XA_BUG_ON(&xa0, xa_alloc(&xa0, &id, 5, xa_mk_index(id),
GFP_KERNEL) != -ENOSPC);
xa_erase_index(&xa0, 3);
XA_BUG_ON(&xa0, !xa_empty(&xa0));
}
static noinline void __check_store_iter(struct xarray *xa, unsigned long start,
@ -822,10 +831,34 @@ static noinline void check_find_2(struct xarray *xa)
xa_destroy(xa);
}
static noinline void check_find_3(struct xarray *xa)
{
XA_STATE(xas, xa, 0);
unsigned long i, j, k;
void *entry;
for (i = 0; i < 100; i++) {
for (j = 0; j < 100; j++) {
for (k = 0; k < 100; k++) {
xas_set(&xas, j);
xas_for_each_marked(&xas, entry, k, XA_MARK_0)
;
if (j > k)
XA_BUG_ON(xa,
xas.xa_node != XAS_RESTART);
}
}
xa_store_index(xa, i, GFP_KERNEL);
xa_set_mark(xa, i, XA_MARK_0);
}
xa_destroy(xa);
}
static noinline void check_find(struct xarray *xa)
{
check_find_1(xa);
check_find_2(xa);
check_find_3(xa);
check_multi_find(xa);
check_multi_find_2(xa);
}

8
lib/xarray.c
View File

@ -1131,7 +1131,7 @@ void *xas_find_marked(struct xa_state *xas, unsigned long max, xa_mark_t mark)
entry = xa_head(xas->xa);
xas->xa_node = NULL;
if (xas->xa_index > max_index(entry))
goto bounds;
goto out;
if (!xa_is_node(entry)) {
if (xa_marked(xas->xa, mark))
return entry;
@ -1180,11 +1180,9 @@ void *xas_find_marked(struct xa_state *xas, unsigned long max, xa_mark_t mark)
}
out:
if (!max)
if (xas->xa_index > max)
goto max;
bounds:
xas->xa_node = XAS_BOUNDS;
return NULL;
return set_bounds(xas);
max:
xas->xa_node = XAS_RESTART;
return NULL;