From d1111a75479d52046d8a71eb3b071581ee55489a Mon Sep 17 00:00:00 2001
From: Nick Terrell <nickrterrell@gmail.com>
Date: Tue, 1 Nov 2016 20:25:27 -0700
Subject: [PATCH] btrfs: Call kunmap if zlib_inflateInit2 fails

If zlib_inflateInit2 fails, the input page is never unmapped.
Add a call to kunmap when it fails.

Signed-off-by: Nick Terrell <nickrterrell@gmail.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
---
 fs/btrfs/zlib.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/fs/btrfs/zlib.c b/fs/btrfs/zlib.c
index 441b81a3e545..0ed90ccd81eb 100644
--- a/fs/btrfs/zlib.c
+++ b/fs/btrfs/zlib.c
@@ -250,6 +250,7 @@ static int zlib_decompress_biovec(struct list_head *ws, struct page **pages_in,
 
 	if (Z_OK != zlib_inflateInit2(&workspace->strm, wbits)) {
 		pr_warn("BTRFS: inflateInit failed\n");
+		kunmap(pages_in[page_in_index]);
 		return -EIO;
 	}
 	while (workspace->strm.total_in < srclen) {