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f2fs: add block address limit check to compressed file 

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@google.com>
Reviewed-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Daeho Jeong 2020-08-31 09:24:01 +09:00 committed by Jaegeuk Kim
parent aad1383cbf
commit 4eda1682cd
1 changed files with 9 additions and 8 deletions
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17
fs/f2fs/data.c
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@ -1803,10 +1803,6 @@ 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);
@ -3813,11 +3809,16 @@ 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;