linux-kernel - [PATCH] mm: kvfree the swap cluster info if the swap file is unsatisfactory

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Date:   Thu, 31 Aug 2017 16:35:15 -0700
From:   "Darrick J. Wong" <darrick.wong@...cle.com>
To:     akpm@...ux-foundation.org, ying.huang@...el.com
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: [PATCH] mm: kvfree the swap cluster info if the swap file is
 unsatisfactory

If initializing a small swap file fails because the swap file has a
problem (holes, etc.) then we need to free the cluster info as part of
cleanup.  Unfortunately a previous patch changed the code to use
kvzalloc but did not change all the vfree calls to use kvfree.

Found by running generic/357 from xfstests.

Signed-off-by: Darrick J. Wong <darrick.wong@...cle.com>
---
 mm/swapfile.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/swapfile.c b/mm/swapfile.c
index 6ba4aab..c1deb01 100644
--- a/mm/swapfile.c
+++ b/mm/swapfile.c
@@ -3052,7 +3052,7 @@ SYSCALL_DEFINE2(swapon, const char __user *, specialfile, int, swap_flags)
 	p->flags = 0;
 	spin_unlock(&swap_lock);
 	vfree(swap_map);
-	vfree(cluster_info);
+	kvfree(cluster_info);
 	if (swap_file) {
 		if (inode && S_ISREG(inode->i_mode)) {
 			inode_unlock(inode);