From: Nick Terrell <nickrterrell@gmail.com>
Date: Wed, 2 Nov 2016 03:25:27 +0000 (-0700)
Subject: btrfs: Call kunmap if zlib_inflateInit2 fails
X-Git-Tag: v4.10-rc1~68^2~24^2~18
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=d1111a75479d52046d8a71eb3b071581ee55489a;p=karo-tx-linux.git

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>
---

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) {