fs/pipe.c | 27 ++++++++++++++++-----------
 1 file changed, 16 insertions(+), 11 deletions(-)

diff --git a/fs/pipe.c b/fs/pipe.c
index 64a494cef0a0..fdca31a34f6e 100644
--- a/fs/pipe.c
+++ b/fs/pipe.c
@@ -759,10 +759,11 @@ static int
 pipe_read_fasync(int fd, struct file *filp, int on)
 {
 	struct inode *inode = file_inode(filp);
-	int retval;
+	int retval = 0;
 
 	mutex_lock(&inode->i_mutex);
-	retval = fasync_helper(fd, filp, on, &inode->i_pipe->fasync_readers);
+	if (inode->i_pipe)
+		retval = fasync_helper(fd, filp, on, &inode->i_pipe->fasync_readers);
 	mutex_unlock(&inode->i_mutex);
 
 	return retval;
@@ -773,10 +774,11 @@ static int
 pipe_write_fasync(int fd, struct file *filp, int on)
 {
 	struct inode *inode = file_inode(filp);
-	int retval;
+	int retval = 0;
 
 	mutex_lock(&inode->i_mutex);
-	retval = fasync_helper(fd, filp, on, &inode->i_pipe->fasync_writers);
+	if (inode->i_pipe)
+		retval = fasync_helper(fd, filp, on, &inode->i_pipe->fasync_writers);
 	mutex_unlock(&inode->i_mutex);
 
 	return retval;
@@ -787,15 +789,18 @@ static int
 pipe_rdwr_fasync(int fd, struct file *filp, int on)
 {
 	struct inode *inode = file_inode(filp);
-	struct pipe_inode_info *pipe = inode->i_pipe;
-	int retval;
+	struct pipe_inode_info *pipe;
+	int retval = 0;
 
 	mutex_lock(&inode->i_mutex);
-	retval = fasync_helper(fd, filp, on, &pipe->fasync_readers);
-	if (retval >= 0) {
-		retval = fasync_helper(fd, filp, on, &pipe->fasync_writers);
-		if (retval < 0) /* this can happen only if on == T */
-			fasync_helper(-1, filp, 0, &pipe->fasync_readers);
+	pipe = inode->i_pipe;
+	if (pipe) {
+		retval = fasync_helper(fd, filp, on, &pipe->fasync_readers);
+		if (retval >= 0) {
+			retval = fasync_helper(fd, filp, on, &pipe->fasync_writers);
+			if (retval < 0) /* this can happen only if on == T */
+				fasync_helper(-1, filp, 0, &pipe->fasync_readers);
+		}
 	}
 	mutex_unlock(&inode->i_mutex);
 	return retval;