linux-kernel - [PATCH] f2fs: add block address limit check to compressed file

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Date:   Mon, 31 Aug 2020 09:24:01 +0900
From:   Daeho Jeong <daeho43@...il.com>
To:     linux-kernel@...r.kernel.org,
        linux-f2fs-devel@...ts.sourceforge.net, kernel-team@...roid.com
Cc:     Daeho Jeong <daehojeong@...gle.com>
Subject: [PATCH] f2fs: add block address limit check to compressed file

From: Daeho Jeong <daehojeong@...gle.com>

Need to add block address range check to compressed file case and
avoid calling get_data_block_bmap() for compressed file.

Signed-off-by: Daeho Jeong <daehojeong@...gle.com>
---
 fs/f2fs/data.c | 17 +++++++++--------
 1 file changed, 9 insertions(+), 8 deletions(-)

diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
index c1b676be67b9..48cab85205e2 100644
--- a/fs/f2fs/data.c
+++ b/fs/f2fs/data.c
@@ -1755,10 +1755,6 @@ static int get_data_block_dio(struct inode *inode, sector_t iblock,
 static int get_data_block_bmap(struct inode *inode, sector_t iblock,
 			struct buffer_head *bh_result, int create)
 {
-	/* Block number less than F2FS MAX BLOCKS */
-	if (unlikely(iblock >= F2FS_I_SB(inode)->max_file_blocks))
-		return -EFBIG;
-
 	return __get_data_block(inode, iblock, bh_result, create,
 						F2FS_GET_BLOCK_BMAP, NULL,
 						NO_CHECK_TYPE, create);
@@ -3753,11 +3749,16 @@ static sector_t f2fs_bmap(struct address_space *mapping, sector_t block)
 	if (mapping_tagged(mapping, PAGECACHE_TAG_DIRTY))
 		filemap_write_and_wait(mapping);
 
-	if (f2fs_compressed_file(inode))
-		blknr = f2fs_bmap_compress(inode, block);
+	/* Block number less than F2FS MAX BLOCKS */
+	if (unlikely(block >= F2FS_I_SB(inode)->max_file_blocks))
+		goto out;
 
-	if (!get_data_block_bmap(inode, block, &tmp, 0))
-		blknr = tmp.b_blocknr;
+	if (f2fs_compressed_file(inode)) {
+		blknr = f2fs_bmap_compress(inode, block);
+	} else {
+		if (!get_data_block_bmap(inode, block, &tmp, 0))
+			blknr = tmp.b_blocknr;
+	}
 out:
 	trace_f2fs_bmap(inode, block, blknr);
 	return blknr;
-- 
2.28.0.402.g5ffc5be6b7-goog