From: Richard Genoud <richard.genoud@posteo.net>
Date: Tue, 24 Nov 2020 17:07:52 +0000 (+0100)
Subject: fs/squashfs: sqfs_close/sqfs_read_sblk: set ctxt.sblk to NULL after free
X-Git-Url: http://git.dujemihanovic.xyz/%22http:/www.sics.se/static/git-favicon.png?a=commitdiff_plain;h=7e932ac790b3615a67a3c24041c194aa748c0d98;p=u-boot.git

fs/squashfs: sqfs_close/sqfs_read_sblk: set ctxt.sblk to NULL after free

This will prevent a double free error if sqfs_close() is called twice.

Signed-off-by: Richard Genoud <richard.genoud@posteo.net>
---

diff --git a/fs/squashfs/sqfs.c b/fs/squashfs/sqfs.c
index 608a2bb454..5de69ac3ca 100644
--- a/fs/squashfs/sqfs.c
+++ b/fs/squashfs/sqfs.c
@@ -49,6 +49,7 @@ static int sqfs_read_sblk(struct squashfs_super_block **sblk)
 
 	if (sqfs_disk_read(0, 1, *sblk) != 1) {
 		free(*sblk);
+		sblk = NULL;
 		return -EINVAL;
 	}
 
@@ -1689,9 +1690,10 @@ free_strings:
 
 void sqfs_close(void)
 {
+	sqfs_decompressor_cleanup(&ctxt);
 	free(ctxt.sblk);
+	ctxt.sblk = NULL;
 	ctxt.cur_dev = NULL;
-	sqfs_decompressor_cleanup(&ctxt);
 }
 
 void sqfs_closedir(struct fs_dir_stream *dirs)