diff options
| author | Jeff Layton <jlayton@primarydata.com> | 2014-08-22 18:26:36 +0200 |
|---|---|---|
| committer | Jeff Layton <jlayton@primarydata.com> | 2014-10-07 20:06:12 +0200 |
| commit | 415b96c5a1fe31ed9deb0618e95ecbb1df3de54c (patch) | |
| tree | be4fbf6503911abac9a71fc0856c3e7a9b27e221 /fs/nfsd | |
| parent | locks: close potential race in lease_get_mtime (diff) | |
| download | linux-415b96c5a1fe31ed9deb0618e95ecbb1df3de54c.tar.xz linux-415b96c5a1fe31ed9deb0618e95ecbb1df3de54c.zip | |
nfsd: fix potential lease memory leak in nfs4_setlease
It's unlikely to ever occur, but if there were already a lease set on
the file then we could end up getting back a different pointer on a
successful setlease attempt than the one we allocated. If that happens,
the one we allocated could leak.
In practice, I don't think this will happen due to the fact that we only
try to set up the lease once per nfs4_file, but this error handling is a
bit more correct given the current lease API.
Cc: J. Bruce Fields <bfields@fieldses.org>
Signed-off-by: Jeff Layton <jlayton@primarydata.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Diffstat (limited to 'fs/nfsd')
| -rw-r--r-- | fs/nfsd/nfs4state.c | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c index a91e521622c3..5bb4952faf5b 100644 --- a/fs/nfsd/nfs4state.c +++ b/fs/nfsd/nfs4state.c @@ -3781,7 +3781,7 @@ static struct file_lock *nfs4_alloc_init_lease(struct nfs4_file *fp, int flag) static int nfs4_setlease(struct nfs4_delegation *dp) { struct nfs4_file *fp = dp->dl_stid.sc_file; - struct file_lock *fl; + struct file_lock *fl, *ret; struct file *filp; int status = 0; @@ -3795,11 +3795,14 @@ static int nfs4_setlease(struct nfs4_delegation *dp) return -EBADF; } fl->fl_file = filp; - status = vfs_setlease(filp, fl->fl_type, &fl); + ret = fl; + status = vfs_setlease(filp, fl->fl_type, &ret); if (status) { locks_free_lock(fl); goto out_fput; } + if (ret != fl) + locks_free_lock(fl); spin_lock(&state_lock); spin_lock(&fp->fi_lock); /* Did the lease get broken before we took the lock? */ |