[Devel] [PATCH rh7 2/2] mm: kvfree the swap cluster info if the swap file is unsatisfactory

[Andrey Ryabinin]

From: "Darrick J. Wong" <darrick.wong at oracle.com>

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.

Link: http://lkml.kernel.org/r/20170831233515.GR3775@magnolia
Fixes: 54f180d3c181 ("mm, swap: use kvzalloc to allocate some swap data structures")
Signed-off-by: Darrick J. Wong <darrick.wong at oracle.com>
Reviewed-by: "Huang, Ying" <ying.huang at intel.com>
Acked-by: David Rientjes <rientjes at google.com>
Cc: Hugh Dickins <hughd at google.com>
Cc: <stable at vger.kernel.org>	[4.12+]
Signed-off-by: Andrew Morton <akpm at linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds at linux-foundation.org>
(cherry picked from commit 8606a1a94da5c4e49c0fb28af62d2e75c6747716)
Signed-off-by: Andrey Ryabinin <aryabinin at virtuozzo.com>
---
 mm/swapfile.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/swapfile.c b/mm/swapfile.c
index a174990d72b9..d69730691db2 100644
--- a/mm/swapfile.c
+++ b/mm/swapfile.c
@@ -2908,7 +2908,7 @@ 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)) {
 			mutex_unlock(&inode->i_mutex);
-- 
2.16.4