Messages in this thread Patch in this message | | | From | Hassan Shahbazi <> | Subject | [PATCH] fix NULL pointer deference crash | Date | Wed, 31 Mar 2021 19:34:29 +0300 |
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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 <h.shahbazi.git@gmail.com> --- 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
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