Description of problem:

file 5.40 can no longer print ext4 filesystem UUIDs correctly.

Version-Release number of selected component (if applicable):

  file-5.40-1.fc35.x86_64

How reproducible:

  100%

Steps to Reproduce:

1. Prepare a disk image in a file:

  $ rm /var/tmp/test.img
  $ truncate -s 1G /var/tmp/test.img
  $ mkfs.ext4 /var/tmp/test.img

2. Run 'file' against it to display the UUID.

With the previous version of file it would display the UUID correcctly, eg:

  $ file /var/tmp/test.img
  /var/tmp/test.img: Linux rev 1.0 ext4 filesystem data, UUID=b1bc22cc-7392-4780-8b50-77dac556236d (extents) (64bit) (large files) (huge files)

With the current version of file it displays it incorrectly, eg:

  $ file /var/tmp/test.img 
  /var/tmp/test.img: Linux rev 1.0 ext4 filesystem data, UUID=b1bc22cc-7392-4780-ffff8b50-77dac556236d (extents) (64bit) (large files) (huge files)

Notice that some parts of the UUID are sign-extended.

I cannot register with the upstream tracker at the moment, but
I did bisect this to the following upstream commit:

  0478d9251abafd0876cdb3121ef2c07af6c99513 is the first bad commit
  commit 0478d9251abafd0876cdb3121ef2c07af6c99513
  Author: Christos Zoulas <christos>
  Date:   Sat Aug 22 18:27:42 2020 +0000

    Treat printf numbers as signed.

   src/softmagic.c | 28 ++++++++++++++--------------
   1 file changed, 14 insertions(+), 14 deletions(-)