From: J. Bruce Fields Date: Wed, 25 Aug 2021 02:36:03 +0000 (-0400) Subject: nfsd: fix crash on LOCKT on reexported NFSv3 X-Git-Url: https://git.kernel.dk/?a=commitdiff_plain;h=eb04c51a439e38dbbab363cf5f0599cbe0507b13;p=linux-block.git nfsd: fix crash on LOCKT on reexported NFSv3 [ Upstream commit 0bcc7ca40bd823193224e9f38bafbd8325aaf566 ] Unlike other filesystems, NFSv3 tries to use fl_file in the GETLK case. Signed-off-by: J. Bruce Fields Signed-off-by: Chuck Lever Signed-off-by: Sasha Levin --- diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c index 142aac9b63a8..0313390fa4b4 100644 --- a/fs/nfsd/nfs4state.c +++ b/fs/nfsd/nfs4state.c @@ -6855,8 +6855,7 @@ out: /* * The NFSv4 spec allows a client to do a LOCKT without holding an OPEN, * so we do a temporary open here just to get an open file to pass to - * vfs_test_lock. (Arguably perhaps test_lock should be done with an - * inode operation.) + * vfs_test_lock. */ static __be32 nfsd_test_lock(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file_lock *lock) { @@ -6871,7 +6870,9 @@ static __be32 nfsd_test_lock(struct svc_rqst *rqstp, struct svc_fh *fhp, struct NFSD_MAY_READ)); if (err) goto out; + lock->fl_file = nf->nf_file; err = nfserrno(vfs_test_lock(nf->nf_file, lock)); + lock->fl_file = NULL; out: fh_unlock(fhp); nfsd_file_put(nf);