diff options
| author | Matthew Wilcox (Oracle) <willy@infradead.org> | 2022-06-08 15:18:34 -0400 |
|---|---|---|
| committer | Matthew Wilcox (Oracle) <willy@infradead.org> | 2022-06-09 16:24:25 -0400 |
| commit | 69a37a8ba1b408a1c7616494aa7018e4b3844cbe (patch) | |
| tree | 5b201858763ce5ab35ef56217b735902c53804f2 /lib/xarray.c | |
| parent | dcfa24ba68991ab69a48254a18377b45180ae664 (diff) | |
mm/huge_memory: Fix xarray node memory leak
If xas_split_alloc() fails to allocate the necessary nodes to complete the
xarray entry split, it sets the xa_state to -ENOMEM, which xas_nomem()
then interprets as "Please allocate more memory", not as "Please free
any unnecessary memory" (which was the intended outcome). It's confusing
to use xas_nomem() to free memory in this context, so call xas_destroy()
instead.
Reported-by: syzbot+9e27a75a8c24f3fe75c1@syzkaller.appspotmail.com
Fixes: 6b24ca4a1a8d ("mm: Use multi-index entries in the page cache")
Cc: stable@vger.kernel.org
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Diffstat (limited to 'lib/xarray.c')
| -rw-r--r-- | lib/xarray.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/lib/xarray.c b/lib/xarray.c index 54e646e8e6ee..ea9ce1f0b386 100644 --- a/lib/xarray.c +++ b/lib/xarray.c @@ -264,9 +264,10 @@ static void xa_node_free(struct xa_node *node) * xas_destroy() - Free any resources allocated during the XArray operation. * @xas: XArray operation state. * - * This function is now internal-only. + * Most users will not need to call this function; it is called for you + * by xas_nomem(). */ -static void xas_destroy(struct xa_state *xas) +void xas_destroy(struct xa_state *xas) { struct xa_node *next, *node = xas->xa_alloc; |