Description: media: v4l: event: Prevent freeing event subscriptions while accessed References: Notes: carnil> Might need as well followup fix 92539d3eda2c ("media: v4l: carnil> event: Add subscription to list before calling "add" carnil> operation") Bugs: upstream: released (4.19-rc7) [ad608fbcf166fec809e402d548761768f602702c] 4.19-upstream-stable: N/A "Fixed before branching point" 4.9-upstream-stable: released (4.9.131) [ec964c3c00457e7ce6b633a33d1c6b61e0091557] 3.16-upstream-stable: released (3.16.61) [a37099499a019538386ef53ca1485cafa6095e0b] sid: released (4.18.20-1) 4.19-buster-security: N/A "Fixed before branching point" 4.9-stretch-security: released (4.9.135-1) 3.16-jessie-security: released (3.16.64-1)