[PATCH] r/o bind mounts: elevate write count for xattr_permission() callers

[platform/adaptation/renesas_rcar/renesas_kernel.git] / fs / nfsd / vfs.c

diff --git a/fs/nfsd/vfs.c b/fs/nfsd/vfs.c
index 18a4cc9..626dfd3 100644 (file)
--- a/fs/nfsd/vfs.c
+++ b/fs/nfsd/vfs.c
@@ -2086,6 +2086,9 @@ nfsd_set_posix_acl(struct svc_fh *fhp, int type, struct posix_acl *acl)
        } else
                size = 0;
 
+       error = mnt_want_write(fhp->fh_export->ex_path.mnt);
+       if (error)
+               goto getout;
        if (size)
                error = vfs_setxattr(fhp->fh_dentry, name, value, size, 0);
        else {
@@ -2097,6 +2100,7 @@ nfsd_set_posix_acl(struct svc_fh *fhp, int type, struct posix_acl *acl)
                                error = 0;
                }
        }
+       mnt_drop_write(fhp->fh_export->ex_path.mnt);
 
 getout:
        kfree(value);