Re: gfs2_fh_to_parent() array overflow

[Christoph Hellwig <hch@lst.de>]

On Wed, Oct 24, 2007 at 06:26:26PM +0200, Adrian Bunk wrote:
> The Coverity checker spotted the following array overflow caused by
> commit 34c0d154243dd913c5690ae6ceb9557017429b9c:

The line is a left-over from times when gfs stored the mode of the
inode in the file handle.  It can simply be deleted.  Steve, do you
want a patch for that or could you commit that one-liner directly?

> fs/gfs2/ops_export.c contains:
> 
> <--  snip  -->
> 
> ...
> static struct dentry *gfs2_fh_to_parent(struct super_block *sb, struct fid *fid,
>                 int fh_len, int fh_type)
> {
>         struct gfs2_inum_host parent;
>         __be32 *fh = (__force __be32 *)fid->raw;  <------------
> 
>         switch (fh_type) {
>         case GFS2_LARGE_FH_SIZE:
>         case GFS2_OLD_FH_SIZE:
>                 parent.no_formal_ino = ((u64)be32_to_cpu(fh[4])) << 32;
>                 parent.no_formal_ino |= be32_to_cpu(fh[5]);
>                 parent.no_addr = ((u64)be32_to_cpu(fh[6])) << 32;
>                                                    ^^^^^
>                 parent.no_addr |= be32_to_cpu(fh[7]);
> ...                                           ^^^^^
> 
> <--  snip  -->
> 
> 
> cu
> Adrian
> 
> -- 
> 
>        "Is there not promise of rain?" Ling Tan asked suddenly out
>         of the darkness. There had been need of rain for many days.
>        "Only a promise," Lao Er said.
>                                        Pearl S. Buck - Dragon Seed
---end quoted text---