On 17.04.20 13:54, Juergen Gross wrote:
Today it can happen that an event channel is being removed from the system while the event handling loop is active. This can lead to a race resulting in crashes or WARN() splats.
Fix this problem by using a rwlock taken as reader in the event handling loop and as writer when removing an event channel.
As the observed problem was a NULL dereference in evtchn_from_irq() make this function more robust against races by testing the irq_info pointer to be not NULL before dereferencing it.
Cc: Marek Marczykowski-Górecki marmarek@invisiblethingslab.com Cc: stable@vger.kernel.org Reported-by: Marek Marczykowski-Górecki marmarek@invisiblethingslab.com Signed-off-by: Juergen Gross jgross@suse.com
Please ignore, script went wild.
Juergen