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-rw-r--r--ipc/mqueue.c16
1 files changed, 14 insertions, 2 deletions
diff --git a/ipc/mqueue.c b/ipc/mqueue.c
index 34262c11f480..94fd3b08fb77 100644
--- a/ipc/mqueue.c
+++ b/ipc/mqueue.c
@@ -598,6 +598,7 @@ static struct file *do_create(struct dentry *dir, struct dentry *dentry,
int oflag, mode_t mode, struct mq_attr __user *u_attr)
{
struct mq_attr attr;
+ struct file *result;
int ret;
if (u_attr) {
@@ -612,13 +613,24 @@ static struct file *do_create(struct dentry *dir, struct dentry *dentry,
}
mode &= ~current->fs->umask;
+ ret = mnt_want_write(mqueue_mnt);
+ if (ret)
+ goto out;
ret = vfs_create(dir->d_inode, dentry, mode, NULL);
dentry->d_fsdata = NULL;
if (ret)
- goto out;
+ goto out_drop_write;
- return dentry_open(dentry, mqueue_mnt, oflag);
+ result = dentry_open(dentry, mqueue_mnt, oflag);
+ /*
+ * dentry_open() took a persistent mnt_want_write(),
+ * so we can now drop this one.
+ */
+ mnt_drop_write(mqueue_mnt);
+ return result;
+out_drop_write:
+ mnt_drop_write(mqueue_mnt);
out:
dput(dentry);
mntput(mqueue_mnt);