From: Chao Yu <chao@kernel.org>
Date: Fri, 14 Nov 2025 06:47:40 +0000 (+0800)
Subject: f2fs: fix to avoid overflow while left shift operation
X-Git-Tag: v6.12.59~95
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=0e75a098b0a37f02ca31fe99ac16004c8163cf67;p=thirdparty%2Fkernel%2Fstable.git

f2fs: fix to avoid overflow while left shift operation

[ Upstream commit 0fe1c6bec54ea68ed8c987b3890f2296364e77bb ]

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@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
[ Modification: Using rpages[i]->index instead of folio->index due to
it was changed since commit:1cda5bc0b2fe ("f2fs: Use a folio in
f2fs_truncate_partial_cluster()") on 6.14 ]
Signed-off-by: Rajani Kantha <681739313@139.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---

diff --git a/fs/f2fs/compress.c b/fs/f2fs/compress.c
index b05bb7bfa14c5..fcd21bb060cd4 100644
--- a/fs/f2fs/compress.c
+++ b/fs/f2fs/compress.c
@@ -1236,7 +1236,7 @@ int f2fs_truncate_partial_cluster(struct inode *inode, u64 from, bool lock)
 		int i;
 
 		for (i = cluster_size - 1; i >= 0; i--) {
-			loff_t start = rpages[i]->index << PAGE_SHIFT;
+			loff_t start = (loff_t)rpages[i]->index << PAGE_SHIFT;
 
 			if (from <= start) {
 				zero_user_segment(rpages[i], 0, PAGE_SIZE);