From 220fa478fb1a84e51235b92506ff5d48415f0a8e Mon Sep 17 00:00:00 2001
From: Heinrich Schuchardt <xypron.glpk@gmx.de>
Date: Mon, 1 Feb 2021 03:28:48 +0100
Subject: [PATCH] fs/squashfs: NULL dereference in sqfs_closedir()
sqfs_opendir() called in sqfs_size(), sqfs_read(), sqfs_exists() may fail
leading to sqfs_closedir(NULL) being called. Do not dereference NULL.
Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
---
fs/squashfs/sqfs.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/fs/squashfs/sqfs.c b/fs/squashfs/sqfs.c
index dca13bd1f1..29805c3c6f 100644
--- a/fs/squashfs/sqfs.c
+++ b/fs/squashfs/sqfs.c
@@ -1716,6 +1716,9 @@ void sqfs_closedir(struct fs_dir_stream *dirs)
{
struct squashfs_dir_stream *sqfs_dirs;
+ if (!dirs)
+ return;
+
sqfs_dirs = (struct squashfs_dir_stream *)dirs;
free(sqfs_dirs->inode_table);
free(sqfs_dirs->dir_table);
--
2.39.5