[PATCH] pipe: Fix iteration end check in fuse_dev_splice_write()

[David Howells]

Fix the iteration end check in fuse_dev_splice_write().  The iterator
position can only be compared with == or != since wrappage may be involved.

Fixes: 8cefc107ca54 ("pipe: Use head and tail pointers for the ring, not cursor and length")
Reported-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: David Howells <dhowells@xxxxxxxxxx>
---

 fs/fuse/dev.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/fuse/dev.c b/fs/fuse/dev.c
index d4e6691d2d92..8e02d76fe104 100644
--- a/fs/fuse/dev.c
+++ b/fs/fuse/dev.c
@@ -1965,7 +1965,7 @@ static ssize_t fuse_dev_splice_write(struct pipe_inode_info *pipe,
 
 	nbuf = 0;
 	rem = 0;
-	for (idx = tail; idx < head && rem < len; idx++)
+	for (idx = tail; idx != head && rem < len; idx++)
 		rem += pipe->bufs[idx & mask].len;
 
 	ret = -EINVAL;