linux-kernel - [PATCH v4 1/4] mm/filemap: return early if failed to allocate memory for split

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Date: Tue, 16 Apr 2024 15:17:19 +0800
From: Kairui Song <ryncsn@...il.com>
To: linux-mm@...ck.org
Cc: Andrew Morton <akpm@...ux-foundation.org>,
	Matthew Wilcox <willy@...radead.org>,
	linux-kernel@...r.kernel.org,
	Kairui Song <kasong@...cent.com>
Subject: [PATCH v4 1/4] mm/filemap: return early if failed to allocate memory for split

From: Kairui Song <kasong@...cent.com>

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.

Signed-off-by: Kairui Song <kasong@...cent.com>
Acked-by: Matthew Wilcox (Oracle) <willy@...radead.org>
---
 mm/filemap.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/mm/filemap.c b/mm/filemap.c
index 30de18c4fd28..d447b36ffd41 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -880,9 +880,12 @@ noinline int __filemap_add_folio(struct address_space *mapping,
 		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;
-- 
2.44.0