[PATCH] fix NULL pointer deference crash
STALE2011d
From: Hassan Shahbazi <hidden>
Date: 2021-03-31 16:44:10
Also in:
dri-devel, lkml
Subsystem:
framebuffer console, framebuffer core, framebuffer layer, the rest · Maintainers:
Helge Deller, Thomas Zimmermann, Simona Vetter, Linus Torvalds
The patch has fixed a NULL pointer deference crash in hiding the cursor. It is verified by syzbot patch tester. Reported by: syzbot https://syzkaller.appspot.com/bug?id=defb47bf56e1c14d5687280c7bb91ce7b608b94b Signed-off-by: Hassan Shahbazi <redacted> --- drivers/video/fbdev/core/fbcon.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/drivers/video/fbdev/core/fbcon.c b/drivers/video/fbdev/core/fbcon.c
index 44a5cd2f54cc..ee252d1c43c6 100644
--- a/drivers/video/fbdev/core/fbcon.c
+++ b/drivers/video/fbdev/core/fbcon.c@@ -1333,8 +1333,9 @@ static void fbcon_cursor(struct vc_data *vc, int mode) ops->cursor_flash = (mode == CM_ERASE) ? 0 : 1; - ops->cursor(vc, info, mode, get_color(vc, info, c, 1), - get_color(vc, info, c, 0)); + if (ops && ops->cursor) + ops->cursor(vc, info, mode, get_color(vc, info, c, 1), + get_color(vc, info, c, 0)); } static int scrollback_phys_max = 0;
--
2.26.3