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-rw-r--r--fs/devpts/inode.c16
1 files changed, 14 insertions, 2 deletions
diff --git a/fs/devpts/inode.c b/fs/devpts/inode.c
index d5f8c96964be..8882ecc0f1bf 100644
--- a/fs/devpts/inode.c
+++ b/fs/devpts/inode.c
@@ -517,11 +517,23 @@ int devpts_pty_new(struct inode *ptmx_inode, struct tty_struct *tty)
struct tty_struct *devpts_get_tty(struct inode *pts_inode, int number)
{
+ struct dentry *dentry;
+ struct tty_struct *tty;
+
BUG_ON(pts_inode->i_rdev == MKDEV(TTYAUX_MAJOR, PTMX_MINOR));
+ /* Ensure dentry has not been deleted by devpts_pty_kill() */
+ dentry = d_find_alias(pts_inode);
+ if (!dentry)
+ return NULL;
+
+ tty = NULL;
if (pts_inode->i_sb->s_magic == DEVPTS_SUPER_MAGIC)
- return (struct tty_struct *)pts_inode->i_private;
- return NULL;
+ tty = (struct tty_struct *)pts_inode->i_private;
+
+ dput(dentry);
+
+ return tty;
}
void devpts_pty_kill(struct tty_struct *tty)