f2fs: fix double free of unicode map

[ Upstream commit 89ff6005039a878afac87889fee748fa3f957c3a ]

In case of retrying fill_super with skip_recovery,
s_encoding for casefold would not be loaded again even though it's
already been freed because it's not NULL.
Set NULL after free to prevent double freeing when unmount.

Fixes: eca4873ee1b6 ("f2fs: Use generic casefolding support")
Signed-off-by: Hyeongseok Kim <hyeongseok@gmail.com>
Reviewed-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
index 00eff2f..fef22e4 100644 (file)
--- a/fs/f2fs/super.c
+++ b/fs/f2fs/super.c
@@ -3918,6 +3918,7 @@ free_bio_info:
 
 #ifdef CONFIG_UNICODE
        utf8_unload(sb->s_encoding);
+       sb->s_encoding = NULL;
 #endif
 free_options:
 #ifdef CONFIG_QUOTA