Re: [PATCH] xen/gntdev: fix gntdev_mmap() error exit path

On 23.04.21 07:40, Juergen Gross wrote:

Commit d3eeb1d77c5d0af ("xen/gntdev: use mmu_interval_notifier_insert") introduced an error in gntdev_mmap(): in case the call of mmu_interval_notifier_insert_locked() fails the exit path should not call mmu_interval_notifier_remove(), as this might result in NULL dereferences.

One reason for failure is e.g. a signal pending for the running process.

Fixes: d3eeb1d77c5d0af ("xen/gntdev: use mmu_interval_notifier_insert") Cc: stable@vger.kernel.org Reported-by: Marek Marczykowski-Górecki marmarek@invisiblethingslab.com Tested-by: Marek Marczykowski-Górecki marmarek@invisiblethingslab.com Signed-off-by: Juergen Gross jgross@suse.com

Pushed to xen/tip.git for-linus-5.13b

Juergen