1 files changed, 13 insertions, 11 deletions

diff --git a/fs/pipe.c b/fs/pipe.c
index cc28623a67b6..9648ac15164a 100644
--- a/fs/pipe.c
+++ b/fs/pipe.c
@@ -253,7 +253,8 @@ pipe_read(struct kiocb *iocb, struct iov_iter *to)
 	 */
 	was_full = pipe_full(pipe->head, pipe->tail, pipe->max_usage);
 	for (;;) {
-		unsigned int head = pipe->head;
+		/* Read ->head with a barrier vs post_one_notification() */
+		unsigned int head = smp_load_acquire(&pipe->head);
 		unsigned int tail = pipe->tail;
 		unsigned int mask = pipe->ring_size - 1;
 
@@ -606,7 +607,7 @@ out:
 static long pipe_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
 {
 	struct pipe_inode_info *pipe = filp->private_data;
-	int count, head, tail, mask;
+	unsigned int count, head, tail, mask;
 
 	switch (cmd) {
 	case FIONREAD:
@@ -803,7 +804,7 @@ struct pipe_inode_info *alloc_pipe_info(void)
 	if (too_many_pipe_buffers_hard(user_bufs) && pipe_is_unprivileged_user())
 		goto out_revert_acct;
 
-	pipe->bufs = kcalloc(pipe_bufs, sizeof(struct pipe_buffer),
+	pipe->bufs = kvcalloc(pipe_bufs, sizeof(struct pipe_buffer),
 			     GFP_KERNEL_ACCOUNT);
 
 	if (pipe->bufs) {
@@ -828,13 +829,11 @@ out_free_uid:
 
 void free_pipe_info(struct pipe_inode_info *pipe)
 {
-	int i;
+	unsigned int i;
 
 #ifdef CONFIG_WATCH_QUEUE
-	if (pipe->watch_queue) {
+	if (pipe->watch_queue)
 		watch_queue_clear(pipe->watch_queue);
-		put_watch_queue(pipe->watch_queue);
-	}
 #endif
 
 	(void) account_pipe_buffers(pipe->user, pipe->nr_accounted, 0);
@@ -844,9 +843,13 @@ void free_pipe_info(struct pipe_inode_info *pipe)
 		if (buf->ops)
 			pipe_buf_release(pipe, buf);
 	}
+#ifdef CONFIG_WATCH_QUEUE
+	if (pipe->watch_queue)
+		put_watch_queue(pipe->watch_queue);
+#endif
 	if (pipe->tmp_page)
 		__free_page(pipe->tmp_page);
-	kfree(pipe->bufs);
+	kvfree(pipe->bufs);
 	kfree(pipe);
 }
 
@@ -1261,8 +1264,7 @@ int pipe_resize_ring(struct pipe_inode_info *pipe, unsigned int nr_slots)
 	if (nr_slots < n)
 		return -EBUSY;
 
-	bufs = kcalloc(nr_slots, sizeof(*bufs),
-		       GFP_KERNEL_ACCOUNT | __GFP_NOWARN);
+	bufs = kvcalloc(nr_slots, sizeof(*bufs), GFP_KERNEL_ACCOUNT);
 	if (unlikely(!bufs))
 		return -ENOMEM;
 
@@ -1289,7 +1291,7 @@ int pipe_resize_ring(struct pipe_inode_info *pipe, unsigned int nr_slots)
 	head = n;
 	tail = 0;
 
-	kfree(pipe->bufs);
+	kvfree(pipe->bufs);
 	pipe->bufs = bufs;
 	pipe->ring_size = nr_slots;
 	if (pipe->max_usage > nr_slots)