2013-03-17 (일), 17:27 +0900, Namjae Jeon:
> From: Namjae Jeon <namjae.jeon@xxxxxxxxxxx>
>
> In function check_nid_range, there is no need to trigger BUG_ON and make kernel stop.
> Instead it could just check and indicate the inode number to be EINVAL.
> Update the return path in do_read_inode to use the return from check_nid_range.
>
> Signed-off-by: Namjae Jeon <namjae.jeon@xxxxxxxxxxx>
> Signed-off-by: Amit Sahrawat <a.sahrawat@xxxxxxxxxxx>
> ---
> fs/f2fs/f2fs.h | 6 ++++--
> fs/f2fs/inode.c | 6 +++++-
> 2 files changed, 9 insertions(+), 3 deletions(-)
>
> diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
> index be7ae70..1dae921 100644
> --- a/fs/f2fs/f2fs.h
> +++ b/fs/f2fs/f2fs.h
> @@ -515,9 +515,11 @@ static inline void mutex_unlock_op(struct f2fs_sb_info *sbi, enum lock_type t)
> /*
> * Check whether the given nid is within node id range.
> */
> -static inline void check_nid_range(struct f2fs_sb_info *sbi, nid_t nid)
> +static inline int check_nid_range(struct f2fs_sb_info *sbi, nid_t nid)
> {
> - BUG_ON((nid >= NM_I(sbi)->max_nid));
> + if (nid >= NM_I(sbi)->max_nid)
> + return -EINVAL;
> + return 0;
At this moment, I'd like to apply this patch and remain BUG_ON together
since we should find real bugs in f2fs.
How do you think?
> }
>
> #define F2FS_DEFAULT_ALLOCATED_BLOCKS 1
> diff --git a/fs/f2fs/inode.c b/fs/f2fs/inode.c
> index ddae412..6d82020 100644
> --- a/fs/f2fs/inode.c
> +++ b/fs/f2fs/inode.c
> @@ -44,7 +44,11 @@ static int do_read_inode(struct inode *inode)
> struct f2fs_inode *ri;
>
> /* Check if ino is within scope */
> - check_nid_range(sbi, inode->i_ino);
> + if (check_nid_range(sbi, inode->i_ino)) {
> + f2fs_msg(inode->i_sb, KERN_ERR, "bad inode number: %lu",
> + (unsigned long) inode->i_ino);
> + return -EINVAL;
> + }
>
> node_page = get_node_page(sbi, inode->i_ino);
> if (IS_ERR(node_page))
--
Jaegeuk Kim
Samsung
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