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nfsd: fix NULL dereference in nfsd_statfs()

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The commit ebabe9a900
    pass a struct path to vfs_statfs
introduced the struct path initialization, and this seems to trigger
an Oops on my machine.

fh_dentry field may be NULL and set later in fh_verify(), thus the
initialization of path must be after fh_verify().

Signed-off-by: Takashi Iwai <[email protected]>
Reviewed-by: Christoph Hellwig <[email protected]>
Reviewed-by: Minchan Kim <[email protected]>
Signed-off-by: J. Bruce Fields <[email protected]>
This commit is contained in:
Takashi Iwai 2010-08-13 15:53:49 +02:00 • committed by J. Bruce Fields
commit f6360efb83
1 changed files with 8 additions and 6 deletions
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14
fs/nfsd/vfs.c
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@ -2033,15 +2033,17 @@ out:
__be32
nfsd_statfs(struct svc_rqst *rqstp, struct svc_fh *fhp, struct kstatfs *stat, int access)
{
struct path path = {
.mnt = fhp->fh_export->ex_path.mnt,
.dentry = fhp->fh_dentry,
};
__be32 err;
err = fh_verify(rqstp, fhp, 0, NFSD_MAY_NOP | access);
if (!err && vfs_statfs(&path, stat))
err = nfserr_io;
if (!err) {
struct path path = {
.mnt = fhp->fh_export->ex_path.mnt,
.dentry = fhp->fh_dentry,
};
if (vfs_statfs(&path, stat))
err = nfserr_io;
}
return err;
}