Patch "f2fs: fix a problem of using memory after free" has been added to the 4.9-stable tree

This is a note to let you know that I've just added the patch titled

f2fs: fix a problem of using memory after free

to the 4.9-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
f2fs-fix-a-problem-of-using-memory-after-free.patch
and it can be found in the queue-4.9 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Yunlei He <[email protected]>
Date: Mon, 19 Dec 2016 20:10:48 +0800
Subject: f2fs: fix a problem of using memory after free

From: Yunlei He <[email protected]>

commit 7855eba4d6102f811b6dd142d6c749f53b591fa3 upstream.

This patch fix a problem of using memory after free in function __try_merge_extent_node.

---
 fs/f2fs/extent_cache.c |    5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

@@ -352,11 +352,12 @@ static struct extent_node *__try_merge_e
 	}
 
 	if (next_ex && __is_front_mergeable(ei, &next_ex->ei)) {
-		if (en)
-			__release_extent_node(sbi, et, prev_ex);
 		next_ex->ei.fofs = ei->fofs;
 		next_ex->ei.blk = ei->blk;
 		next_ex->ei.len += ei->len;
+		if (en)
+			__release_extent_node(sbi, et, prev_ex);
+
 		en = next_ex;
 	}
 

Patches currently in stable-queue which might be from [email protected] are

queue-4.9/f2fs-fix-a-problem-of-using-memory-after-free.patch