It uses a single label and checks the validity of each pointer. This
is err-prone, and actually we once had a bug because one of the check
was insufficient.
Use multi lables as we do in other places.
Signed-off-by: Li Zefan <lize...@huawei.com>
---
kernel/cgroup.c | 33 +++++++++++++++------------------
1 file changed, 15 insertions(+), 18 deletions(-)
diff --git a/kernel/cgroup.c b/kernel/cgroup.c
index 916a699..f0d7f5d 100644
--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -3945,31 +3945,31 @@ static int cgroup_write_event_control(struct cgroup
*cgrp, struct cftype *cft,
efile = eventfd_fget(efd);
if (IS_ERR(efile)) {
ret = PTR_ERR(efile);
- goto fail;
+ goto out_kfree;
}
event->eventfd = eventfd_ctx_fileget(efile);
if (IS_ERR(event->eventfd)) {
ret = PTR_ERR(event->eventfd);
- goto fail;
+ goto out_put_efile;
}
cfile = fget(cfd);
if (!cfile) {
ret = -EBADF;
- goto fail;
+ goto out_put_eventfd;
}
/* the process need read permission on control file */
/* AV: shouldn't we check that it's been opened for read instead? */
ret = inode_permission(file_inode(cfile), MAY_READ);
if (ret < 0)
- goto fail;
+ goto out_put_cfile;
event->cft = __file_cft(cfile);
if (IS_ERR(event->cft)) {
ret = PTR_ERR(event->cft);
- goto fail;
+ goto out_put_cfile;
}
/*
@@ -3979,18 +3979,18 @@ static int cgroup_write_event_control(struct cgroup
*cgrp, struct cftype *cft,
cgrp_cfile = __d_cgrp(cfile->f_dentry->d_parent);
if (cgrp_cfile != cgrp) {
ret = -EINVAL;
- goto fail;
+ goto out_put_cfile;
}
if (!event->cft->register_event || !event->cft->unregister_event) {
ret = -EINVAL;
- goto fail;
+ goto out_put_cfile;
}
ret = event->cft->register_event(cgrp, event->cft,
event->eventfd, buffer);
if (ret)
- goto fail;
+ goto out_put_cfile;
efile->f_op->poll(efile, &event->pt);
@@ -4010,16 +4010,13 @@ static int cgroup_write_event_control(struct cgroup
*cgrp, struct cftype *cft,
return 0;
-fail:
- if (cfile)
- fput(cfile);
-
- if (event && event->eventfd && !IS_ERR(event->eventfd))
- eventfd_ctx_put(event->eventfd);
-
- if (!IS_ERR_OR_NULL(efile))
- fput(efile);
-
+out_put_cfile:
+ fput(cfile);
+out_put_eventfd:
+ eventfd_ctx_put(event->eventfd);
+out_put_efile:
+ fput(efile);
+out_kfree:
kfree(event);
return ret;
--
1.8.0.2
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