Re: gfs2_fh_to_parent() array overflow
From: Christoph Hellwig
Date: Sat Oct 27 2007 - 17:01:19 EST
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---
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