diff options
| author | Takashi Iwai <tiwai@suse.de> | 2010-08-13 15:53:49 +0200 |
|---|---|---|
| committer | J. Bruce Fields <bfields@redhat.com> | 2010-08-26 13:23:16 -0400 |
| commit | f6360efb83cd6dd1476cd758834c8277508c1f15 (patch) | |
| tree | e57015159bf6f361d45050f28a8da7beaceaea60 /fs/nfsd/vfs.c | |
| parent | f632265d0ffb5acf331252d98c64939849d96bb2 (diff) | |
| download | lwn-f6360efb83cd6dd1476cd758834c8277508c1f15.tar.gz lwn-f6360efb83cd6dd1476cd758834c8277508c1f15.zip | |
nfsd: fix NULL dereference in nfsd_statfs()
The commit ebabe9a9001af0af56c0c2780ca1576246e7a74b
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 <tiwai@suse.de>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Minchan Kim <minchan.kim@gmail.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Diffstat (limited to 'fs/nfsd/vfs.c')
| -rw-r--r-- | fs/nfsd/vfs.c | 14 |
1 files changed, 8 insertions, 6 deletions
diff --git a/fs/nfsd/vfs.c b/fs/nfsd/vfs.c index 96360a83cb91..661a6cf8e826 100644 --- a/fs/nfsd/vfs.c +++ b/fs/nfsd/vfs.c @@ -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; } |