[JFFS2] Fix potential memory leak of dead xattrs on unmount.

An xattr_datum which ends up orphaned should be freed by the GC 
thread. But if we umount before the GC thread is finished, or if we 
mount read-only and the GC thread never runs, they might never be 
freed. Clean them up during unmount, if there are any left.

Signed-off-by: David Woodhouse <dwmw2@infradead.org>

1 files changed, 4 insertions, 0 deletions

diff --git a/fs/jffs2/xattr.c b/fs/jffs2/xattr.c
index 073469856d4e..e48665984cb3 100644
--- a/fs/jffs2/xattr.c
+++ b/fs/jffs2/xattr.c
@@ -754,6 +754,10 @@ void jffs2_clear_xattr_subsystem(struct jffs2_sb_info *c)
                 list_del(&xd->xindex);
                 jffs2_free_xattr_datum(xd);
         }
+        list_for_each_entry_safe(xd, _xd, &c->xattr_unchecked, xindex) {
+                list_del(&xd->xindex);
+                jffs2_free_xattr_datum(xd);
+        }
 }
 
 #define XREF_TMPHASH_SIZE       (128)