[PATCH 4.13 16/27] mm/swapfile.c: fix swapon frontswap_map memory leak on error

[Greg Kroah-Hartman]

4.13-stable review patch.  If anyone has any objections, please let me know.

------------------

From: David Rientjes <rientjes@xxxxxxxxxx>

commit b6b1fd2a6bedd533aeed83924d7be0e944fded9f upstream.

Free frontswap_map if an error is encountered before enable_swap_info().

Signed-off-by: David Rientjes <rientjes@xxxxxxxxxx>
Reviewed-by: "Huang, Ying" <ying.huang@xxxxxxxxx>
Cc: Darrick J. Wong <darrick.wong@xxxxxxxxxx>
Cc: Hugh Dickins <hughd@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 mm/swapfile.c |    1 +
 1 file changed, 1 insertion(+)

--- a/mm/swapfile.c
+++ b/mm/swapfile.c
@@ -3053,6 +3053,7 @@ bad_swap:
 	spin_unlock(&swap_lock);
 	vfree(swap_map);
 	kvfree(cluster_info);
+	kvfree(frontswap_map);
 	if (swap_file) {
 		if (inode && S_ISREG(inode->i_mode)) {
 			inode_unlock(inode);