[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 <rient...@google.com>

commit b6b1fd2a6bedd533aeed83924d7be0e944fded9f upstream.

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

Signed-off-by: David Rientjes <rient...@google.com>
Reviewed-by: "Huang, Ying" <ying.hu...@intel.com>
Cc: Darrick J. Wong <darrick.w...@oracle.com>
Cc: Hugh Dickins <hu...@google.com>
Signed-off-by: Andrew Morton <a...@linux-foundation.org>
Signed-off-by: Linus Torvalds <torva...@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>

---
 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);