linux-kernel - [PATCH 1/3] f2fs: fix to avoid overflow while left shift operation

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Message-ID: <20250802021832.1882302-1-chao@kernel.org>
Date: Sat,  2 Aug 2025 10:18:30 +0800
From: Chao Yu <chao@...nel.org>
To: jaegeuk@...nel.org
Cc: linux-f2fs-devel@...ts.sourceforge.net,
	linux-kernel@...r.kernel.org,
	Chao Yu <chao@...nel.org>
Subject: [PATCH 1/3] f2fs: fix to avoid overflow while left shift operation

Should cast type of folio->index from pgoff_t to loff_t to avoid overflow
while left shift operation.

Fixes: 3265d3db1f16 ("f2fs: support partial truncation on compressed inode")
Signed-off-by: Chao Yu <chao@...nel.org>
---
 fs/f2fs/compress.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/f2fs/compress.c b/fs/f2fs/compress.c
index 5c1f47e45dab..6cd8902849cf 100644
--- a/fs/f2fs/compress.c
+++ b/fs/f2fs/compress.c
@@ -1245,7 +1245,7 @@ int f2fs_truncate_partial_cluster(struct inode *inode, u64 from, bool lock)
 
 		for (i = cluster_size - 1; i >= 0; i--) {
 			struct folio *folio = page_folio(rpages[i]);
-			loff_t start = folio->index << PAGE_SHIFT;
+			loff_t start = (loff_t)folio->index << PAGE_SHIFT;
 
 			if (from <= start) {
 				folio_zero_segment(folio, 0, folio_size(folio));
-- 
2.49.0