f2fs: bug fix on bit overflow from 32bits to 64bits

This patch fixes some bit overflows by the shift operations.

Dan Carpenter reported potential bugs on bit overflows as follows.

fs/f2fs/segment.c:910 submit_write_page()
	warn: should 'blk_addr << ((sbi)->log_blocksize - 9)' be a 64 bit type?
fs/f2fs/checkpoint.c:429 get_valid_checkpoint()
	warn: should '1 << ()' be a 64 bit type?
fs/f2fs/data.c:408 f2fs_readpage()
	warn: should 'blk_addr << ((sbi)->log_blocksize - 9)' be a 64 bit type?
fs/f2fs/data.c:457 submit_read_page()
	warn: should 'blk_addr << ((sbi)->log_blocksize - 9)' be a 64 bit type?
fs/f2fs/data.c:525 get_data_block_ro()
	warn: should 'i << blkbits' be a 64 bit type?

Bug-Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>

diff --git a/fs/f2fs/checkpoint.c b/fs/f2fs/checkpoint.c
index 3e62987..21e7215 100644 (file)
--- a/fs/f2fs/checkpoint.c
+++ b/fs/f2fs/checkpoint.c
@@ -426,7 +426,8 @@ int get_valid_checkpoint(struct f2fs_sb_info *sbi)
        cp1 = validate_checkpoint(sbi, cp_start_blk_no, &cp1_version);
 
        /* The second checkpoint pack should start at the next segment */
-       cp_start_blk_no += 1 << le32_to_cpu(fsb->log_blocks_per_seg);
+       cp_start_blk_no += ((unsigned long long)1) <<
+                               le32_to_cpu(fsb->log_blocks_per_seg);
        cp2 = validate_checkpoint(sbi, cp_start_blk_no, &cp2_version);
 
        if (cp1 && cp2) {

diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
index 2d02cf3..24f752d 100644 (file)
--- a/fs/f2fs/data.c
+++ b/fs/f2fs/data.c
@@ -525,7 +525,7 @@ static int get_data_block_ro(struct inode *inode, sector_t iblock,
                                != (dn.data_blkaddr + i)) || maxblocks == i)
                                break;
                map_bh(bh_result, inode->i_sb, dn.data_blkaddr);
-               bh_result->b_size = (i << blkbits);
+               bh_result->b_size = (((size_t)i) << blkbits);
        }
        f2fs_put_dnode(&dn);
        trace_f2fs_get_data_block(inode, iblock, bh_result, 0);

diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
index 1e83713..0387863 100644 (file)
--- a/fs/f2fs/segment.c
+++ b/fs/f2fs/segment.c
@@ -270,8 +270,8 @@ static void locate_dirty_segment(struct f2fs_sb_info *sbi, unsigned int segno)
 static void f2fs_issue_discard(struct f2fs_sb_info *sbi,
                                block_t blkstart, block_t blklen)
 {
-       sector_t start = ((sector_t)blkstart) << sbi->log_sectors_per_block;
-       sector_t len = ((sector_t)blklen) << sbi->log_sectors_per_block;
+       sector_t start = SECTOR_FROM_BLOCK(sbi, blkstart);
+       sector_t len = SECTOR_FROM_BLOCK(sbi, blklen);
        blkdev_issue_discard(sbi->sb->s_bdev, start, len, GFP_NOFS, 0);
        trace_f2fs_issue_discard(sbi->sb, blkstart, blklen);
 }

diff --git a/fs/f2fs/segment.h b/fs/f2fs/segment.h
index b84dd23..07887e1 100644 (file)
--- a/fs/f2fs/segment.h
+++ b/fs/f2fs/segment.h
@@ -86,9 +86,9 @@
 #define TOTAL_SECS(sbi)        (sbi->total_sections)
 
 #define SECTOR_FROM_BLOCK(sbi, blk_addr)                               \
-       (blk_addr << ((sbi)->log_blocksize - F2FS_LOG_SECTOR_SIZE))
+       (((sector_t)blk_addr) << (sbi)->log_sectors_per_block)
 #define SECTOR_TO_BLOCK(sbi, sectors)                                  \
-       (sectors >> ((sbi)->log_blocksize - F2FS_LOG_SECTOR_SIZE))
+       (sectors >> (sbi)->log_sectors_per_block)
 #define MAX_BIO_BLOCKS(max_hw_blocks)                                  \
        (min((int)max_hw_blocks, BIO_MAX_PAGES))