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authorAmir Goldstein <amir73il@gmail.com>2017-09-25 16:39:55 +0300
committerMiklos Szeredi <mszeredi@redhat.com>2017-10-05 15:53:18 +0200
commit5820dc0888d302ac05f8b91ffdf7e4e53b4fbf53 (patch)
treee22ae933b338fe9a51f34cef6658d82484aaff91 /fs/overlayfs
parentdc7ab6773e8171e07f16fd0df0c5eea28c899503 (diff)
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ovl: fix missing unlock_rename() in ovl_do_copy_up()
Use the ovl_lock_rename_workdir() helper which requires unlock_rename() only on lock success. Fixes: ("fd210b7d67ee ovl: move copy up lock out") Cc: <stable@vger.kernel.org> # v4.13 Signed-off-by: Amir Goldstein <amir73il@gmail.com> Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Diffstat (limited to 'fs/overlayfs')
-rw-r--r--fs/overlayfs/copy_up.c6
-rw-r--r--fs/overlayfs/dir.c20
-rw-r--r--fs/overlayfs/overlayfs.h1
-rw-r--r--fs/overlayfs/util.c19
4 files changed, 22 insertions, 24 deletions
diff --git a/fs/overlayfs/copy_up.c b/fs/overlayfs/copy_up.c
index aad97b30d5e6..c441f9387a1b 100644
--- a/fs/overlayfs/copy_up.c
+++ b/fs/overlayfs/copy_up.c
@@ -561,10 +561,8 @@ static int ovl_do_copy_up(struct ovl_copy_up_ctx *c)
c->tmpfile = true;
err = ovl_copy_up_locked(c);
} else {
- err = -EIO;
- if (lock_rename(c->workdir, c->destdir) != NULL) {
- pr_err("overlayfs: failed to lock workdir+upperdir\n");
- } else {
+ err = ovl_lock_rename_workdir(c->workdir, c->destdir);
+ if (!err) {
err = ovl_copy_up_locked(c);
unlock_rename(c->workdir, c->destdir);
}
diff --git a/fs/overlayfs/dir.c b/fs/overlayfs/dir.c
index 3309b1912241..cc961a3bd3bd 100644
--- a/fs/overlayfs/dir.c
+++ b/fs/overlayfs/dir.c
@@ -216,26 +216,6 @@ out_unlock:
return err;
}
-static int ovl_lock_rename_workdir(struct dentry *workdir,
- struct dentry *upperdir)
-{
- /* Workdir should not be the same as upperdir */
- if (workdir == upperdir)
- goto err;
-
- /* Workdir should not be subdir of upperdir and vice versa */
- if (lock_rename(workdir, upperdir) != NULL)
- goto err_unlock;
-
- return 0;
-
-err_unlock:
- unlock_rename(workdir, upperdir);
-err:
- pr_err("overlayfs: failed to lock workdir+upperdir\n");
- return -EIO;
-}
-
static struct dentry *ovl_clear_empty(struct dentry *dentry,
struct list_head *list)
{
diff --git a/fs/overlayfs/overlayfs.h b/fs/overlayfs/overlayfs.h
index d4e8c1a08fb0..c706a6f99928 100644
--- a/fs/overlayfs/overlayfs.h
+++ b/fs/overlayfs/overlayfs.h
@@ -235,6 +235,7 @@ bool ovl_inuse_trylock(struct dentry *dentry);
void ovl_inuse_unlock(struct dentry *dentry);
int ovl_nlink_start(struct dentry *dentry, bool *locked);
void ovl_nlink_end(struct dentry *dentry, bool locked);
+int ovl_lock_rename_workdir(struct dentry *workdir, struct dentry *upperdir);
static inline bool ovl_is_impuredir(struct dentry *dentry)
{
diff --git a/fs/overlayfs/util.c b/fs/overlayfs/util.c
index 7ae33d225a67..b9b239fa5cfd 100644
--- a/fs/overlayfs/util.c
+++ b/fs/overlayfs/util.c
@@ -560,3 +560,22 @@ void ovl_nlink_end(struct dentry *dentry, bool locked)
mutex_unlock(&OVL_I(d_inode(dentry))->lock);
}
}
+
+int ovl_lock_rename_workdir(struct dentry *workdir, struct dentry *upperdir)
+{
+ /* Workdir should not be the same as upperdir */
+ if (workdir == upperdir)
+ goto err;
+
+ /* Workdir should not be subdir of upperdir and vice versa */
+ if (lock_rename(workdir, upperdir) != NULL)
+ goto err_unlock;
+
+ return 0;
+
+err_unlock:
+ unlock_rename(workdir, upperdir);
+err:
+ pr_err("overlayfs: failed to lock workdir+upperdir\n");
+ return -EIO;
+}