[PATCH v2 22/28] fs/squashfs: sqfs_close/sqfs_read_sblk: set ctxt.sblk to NULL after free

[Richard Genoud]

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

Signed-off-by: Richard Genoud <richard.genoud at posteo.net>
---
 fs/squashfs/sqfs.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/fs/squashfs/sqfs.c b/fs/squashfs/sqfs.c
index 7d6f0e88e31..a46e19c75c5 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;
 	}
 
@@ -1638,6 +1639,7 @@ free_strings:
 void sqfs_close(void)
 {
 	free(ctxt.sblk);
+	ctxt.sblk = NULL;
 	ctxt.cur_dev = NULL;
 	sqfs_decompressor_cleanup(&ctxt);
 }