Comment 12 for bug 1952094

There are 2 patches against fs/cifs in that interval:

git log --pretty=oneline Ubuntu-5.4.0-89.100..Ubuntu-5.4.0-90.101 -- fs/cifs/
bc3d24f536d5e79ba474f192280a18d060a4c33f cifs: fix wrong release in sess_alloc_buffer() failed path
3d5631a27ec4767ac80dbf553f9ae501b18e07e3 CIFS: Fix a potencially linear read overflow

The second patch touches fs/cifs/cifs_unicode.c which makes it a strong candidate for having caused this regression. Please try the following kernel which has that patch reverted:

wget https://kernel.ubuntu.com/~rtg/lp1952094/amd64/linux-image-unsigned-5.4.0-91-generic_5.4.0-91.102~lp1952094.1_amd64.deb
wget https://kernel.ubuntu.com/~rtg/lp1952094/amd64/linux-modules-5.4.0-91-generic_5.4.0-91.102~lp1952094.1_amd64.deb
wget https://kernel.ubuntu.com/~rtg/lp1952094/amd64/linux-modules-extra-5.4.0-91-generic_5.4.0-91.102~lp1952094.1_amd64.deb
sudo dpkg -i linux*.deb
sudo reboot