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f2fs: add a max block check for get_data_block_bmap 

This patch adds a max block check for get_data_block_bmap.

Trinity test program will send a block number as parameter into
ioctl_fibmap, which will be used in get_node_path(), when the block
number large than f2fs max blocks, it will trigger kernel bug.

Signed-off-by: Yunlei He <heyunlei@huawei.com>
Signed-off-by: Xue Liu <liuxueliu.liu@huawei.com>
[Jaegeuk Kim: fix missing condition, pointed by Chao Yu]
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Yunlei He 2015-12-28 21:48:32 +08:00 committed by Jaegeuk Kim
parent 9a950d52b7
commit 179448bfe4
3 changed files with 6 additions and 1 deletions
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4
fs/f2fs/data.c
View File

@ -761,6 +761,10 @@ 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 >= max_file_size(0)))
return -EFBIG;
return __get_data_block(inode, iblock, bh_result, create,
F2FS_GET_BLOCK_BMAP);
}

1
fs/f2fs/f2fs.h
View File

@ -1726,6 +1726,7 @@ static inline int f2fs_add_link(struct dentry *dentry, struct inode *inode)
* super.c
*/
int f2fs_commit_super(struct f2fs_sb_info *, bool);
loff_t max_file_size(unsigned bits);
int f2fs_sync_fs(struct super_block *, int);
extern __printf(3, 4)
void f2fs_msg(struct super_block *, const char *, const char *, ...);

2
fs/f2fs/super.c
View File

@ -907,7 +907,7 @@ static const struct export_operations f2fs_export_ops = {
.get_parent = f2fs_get_parent,
};
static loff_t max_file_size(unsigned bits)
loff_t max_file_size(unsigned bits)
{
loff_t result = (DEF_ADDRS_PER_INODE - F2FS_INLINE_XATTR_ADDRS);
loff_t leaf_count = ADDRS_PER_BLOCK;