@@ -2254,7 +2254,7 @@ static int fbcon_switch(struct vc_data *vc)
fbcon_update_softback(vc);
}
- if (logo_shown >= 0) {
+ if (logo_shown >= 0 && vc_cons_allocated(logo_shown)) {
struct vc_data *conp2 = vc_cons[logo_shown].d;
if (conp2->vc_top == logo_lines
@@ -2852,7 +2852,7 @@ static void fbcon_scrolldelta(struct vc_data *vc, int lines)
return;
if (vc->vc_mode != KD_TEXT || !lines)
return;
- if (logo_shown >= 0) {
+ if (logo_shown >= 0 && vc_cons_allocated(logo_shown)) {
struct vc_data *conp2 = vc_cons[logo_shown].d;
if (conp2->vc_top == logo_lines
Add check for vc_cons[logo_shown].d, as it can be released by vt_ioctl(VT_DISALLOCATE). Reported-by: syzbot+732528bae351682f1f27@syzkaller.appspotmail.com Signed-off-by: Qiujun Huang <hqjagain@gmail.com> --- drivers/video/fbdev/core/fbcon.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)