From: Theodore Ts'o <tytso@mit.edu>
Date: Wed, 27 Jan 2021 21:41:05 +0000 (-0500)
Subject: e2fsck: declare the size of bh->b_data to be 4096 in jfs_user.h
X-Git-Tag: v1.45.7~16
X-Git-Url: https://git.whamcloud.com/?a=commitdiff_plain;h=865221f5aa31bfed1cc06da5815399c9d6c7ef90;p=tools%2Fe2fsprogs.git

e2fsck: declare the size of bh->b_data to be 4096 in jfs_user.h

When allocating buffer_heads in e2fsck and debugfs the actual size of
the memory which is requested is based on the file system block size.
So the actual size of b_data in struct buffer_head doesn't actually
matter, except that it can triggers a UBSAN error when running the
e2fsck regression test.  So change it to be 4096 to avoid this false
positive.

Signed-off-by: Theodore Ts'o <tytso@mit.edu>
---

diff --git a/e2fsck/jfs_user.h b/e2fsck/jfs_user.h
index a1c6951..f073355 100644
--- a/e2fsck/jfs_user.h
+++ b/e2fsck/jfs_user.h
@@ -51,7 +51,7 @@ struct buffer_head {
 	unsigned int	b_dirty:1;
 	unsigned int	b_uptodate:1;
 	unsigned long long b_blocknr;
-	char		b_data[1024];
+	char		b_data[4096];
 };
 
 struct inode {