The patch titled
Subject: mm/swapfile.c: fix swap space leak in error path of swap_free_entries()
has been added to the -mm tree. Its filename is
mm-swap-fix-swap-space-leak-in-error-path-of-swap_free_entries.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-swap-fix-swap-space-leak-in-error-path-of-swap_free_entries.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-swap-fix-swap-space-leak-in-error-path-of-swap_free_entries.patch
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------------------------------------------------------
From: Huang Ying <ying.huang@xxxxxxxxx>
Subject: 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@xxxxxxxxx
Signed-off-by: "Huang, Ying" <ying.huang@xxxxxxxxx>
Acked-by: Tim Chen <tim.c.chen@xxxxxxxxxxxxxxx>
Cc: Rik van Riel <riel@xxxxxxxxxx>
Cc: Hugh Dickins <hughd@xxxxxxxxxx>
Cc: Shaohua Li <shli@xxxxxxxxxx>
Cc: Minchan Kim <minchan@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/swapfile.c | 2 --
1 file changed, 2 deletions(-)
diff -puN mm/swapfile.c~mm-swap-fix-swap-space-leak-in-error-path-of-swap_free_entries mm/swapfile.c
--- a/mm/swapfile.c~mm-swap-fix-swap-space-leak-in-error-path-of-swap_free_entries
+++ a/mm/swapfile.c
@@ -1091,8 +1091,6 @@ void swapcache_free_entries(swp_entry_t
p = swap_info_get_cont(entries[i], prev);
if (p)
swap_entry_free(p, entries[i]);
- else
- break;
prev = p;
}
if (p)
_
Patches currently in -mm which might be from ying.huang@xxxxxxxxx are
mm-swap-fix-a-race-in-free_swap_and_cache.patch
mm-swap-fix-comment-in-__read_swap_cache_async.patch
mm-swap-improve-readability-via-make-spin_lock-unlock-balanced.patch
mm-swap-avoid-lock-swap_avail_lock-when-held-cluster-lock.patch
mm-swap-remove-unused-function-prototype.patch
mm-swap-sort-swap-entries-before-free.patch
mm-swap-fix-swap-space-leak-in-error-path-of-swap_free_entries.patch
mm-swap-use-kvzalloc-to-allocate-some-swap-data-structure.patch
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