6.6-stable review patch. If anyone has any objections, please let me know.
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From: Kairui Song kasong@tencent.com
commit de60fd8ddeda2b41fbe11df11733838c5f684616 upstream.
xas_split_alloc could fail with NOMEM, and in such case, it should abort early instead of keep going and fail the xas_split below.
Link: https://lkml.kernel.org/r/20240416071722.45997-1-ryncsn@gmail.com Link: https://lkml.kernel.org/r/20240415171857.19244-1-ryncsn@gmail.com Link: https://lkml.kernel.org/r/20240415171857.19244-2-ryncsn@gmail.com Signed-off-by: Kairui Song kasong@tencent.com Acked-by: Matthew Wilcox (Oracle) willy@infradead.org Signed-off-by: Andrew Morton akpm@linux-foundation.org Stable-dep-of: 6758c1128ceb ("mm/filemap: optimize filemap folio adding") Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- mm/filemap.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-)
--- a/mm/filemap.c +++ b/mm/filemap.c @@ -872,9 +872,12 @@ noinline int __filemap_add_folio(struct unsigned int order = xa_get_order(xas.xa, xas.xa_index); void *entry, *old = NULL;
- if (order > folio_order(folio)) + if (order > folio_order(folio)) { xas_split_alloc(&xas, xa_load(xas.xa, xas.xa_index), order, gfp); + if (xas_error(&xas)) + goto error; + } xas_lock_irq(&xas); xas_for_each_conflict(&xas, entry) { old = entry;