AcoSail/kernel_optimize_test
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f2fs: fix potential corruption in area before F2FS_SUPER_OFFSET

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sb_getblk does not guarantee the buffer head is uptodate. If bh is not
uptodate, the data (may be used as boot code) in area before
F2FS_SUPER_OFFSET may get corrupted when super block is committed.

Signed-off-by: Sheng Yong <shengyong1@huawei.com>
Reviewed-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Sheng Yong 2018-01-29 19:13:15 +08:00 committed by Jaegeuk Kim
parent bdbc90fa55
commit 0964fc1a82
1 changed files with 2 additions and 3 deletions
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5
fs/f2fs/super.c
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@ -1894,7 +1894,6 @@ static int __f2fs_commit_super(struct buffer_head *bh,
lock_buffer(bh);
if (super)
memcpy(bh->b_data + F2FS_SUPER_OFFSET, super, sizeof(*super));
set_buffer_uptodate(bh);
set_buffer_dirty(bh);
unlock_buffer(bh);
@ -2334,7 +2333,7 @@ int f2fs_commit_super(struct f2fs_sb_info *sbi, bool recover)
}
/* write back-up superblock first */
bh = sb_getblk(sbi->sb, sbi->valid_super_block ? 0: 1);
bh = sb_bread(sbi->sb, sbi->valid_super_block ? 0 : 1);
if (!bh)
return -EIO;
err = __f2fs_commit_super(bh, F2FS_RAW_SUPER(sbi));
@ -2345,7 +2344,7 @@ int f2fs_commit_super(struct f2fs_sb_info *sbi, bool recover)
return err;
/* write current valid superblock */
bh = sb_getblk(sbi->sb, sbi->valid_super_block);
bh = sb_bread(sbi->sb, sbi->valid_super_block);
if (!bh)
return -EIO;
err = __f2fs_commit_super(bh, F2FS_RAW_SUPER(sbi));