From 0ccfece6ed507738c0e7e4414c3688b78d4e3756 Mon Sep 17 00:00:00 2001
From: Huang Ying <ying.huang@intel.com>
Date: Wed, 3 May 2017 14:56:16 -0700
Subject: [PATCH] mm/swapfile.c: fix swap space leak in error path of
 swap_free_entries()

In swapcache_free_entries(), if swap_info_get_cont() returns NULL,
something wrong occurs for the swap entry.  But we should still continue
to free the following swap entries in the array instead of skip them to
avoid swap space leak.  This is just problem in error path, where system
may be in an inconsistent state, but it is still good to fix it.

Link: http://lkml.kernel.org/r/20170421124739.24534-1-ying.huang@intel.com
Signed-off-by: "Huang, Ying" <ying.huang@intel.com>
Acked-by: Tim Chen <tim.c.chen@linux.intel.com>
Cc: Rik van Riel <riel@redhat.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Shaohua Li <shli@kernel.org>
Cc: Minchan Kim <minchan@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---
 mm/swapfile.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/mm/swapfile.c b/mm/swapfile.c
index 53b5881ee0d6..b86b2aca3fb9 100644
--- a/mm/swapfile.c
+++ b/mm/swapfile.c
@@ -1079,8 +1079,6 @@ void swapcache_free_entries(swp_entry_t *entries, int n)
 		p = swap_info_get_cont(entries[i], prev);
 		if (p)
 			swap_entry_free(p, entries[i]);
-		else
-			break;
 		prev = p;
 	}
 	if (p)