f2fs: fix to avoid overflow while left shift operation

[ Upstream commit 0fe1c6b ]

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

Fixes: 3265d3d ("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: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
(cherry picked from commit ef49378864bb1ed14cd48c8e687729e12714d849)
Signed-off-by: Wentao Guan <guanwentao@uniontech.com>

Author: chaseyu

fs/f2fs/compress.c

@@ -1210,7 +1210,7 @@ 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);