1 From 249d4b6f0c21546c06e831b822de5861b0d43807 Mon Sep 17 00:00:00 2001
2 From: Kangjie Lu <kjlu@umn.edu>
3 Date: Mon, 1 Apr 2019 17:46:58 +0200
4 Subject: video: hgafb: fix potential NULL pointer dereference
6 [ Upstream commit ec7f6aad57ad29e4e66cc2e18e1e1599ddb02542 ]
8 When ioremap fails, hga_vram should not be dereferenced. The fix
9 check the failure to avoid NULL pointer dereference.
11 Signed-off-by: Kangjie Lu <kjlu@umn.edu>
12 Cc: Aditya Pakki <pakki001@umn.edu>
13 Cc: Ferenc Bakonyi <fero@drama.obuda.kando.hu>
14 [b.zolnierkie: minor patch summary fixup]
15 Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
16 Signed-off-by: Sasha Levin <sashal@kernel.org>
18 drivers/video/fbdev/hgafb.c | 2 ++
19 1 file changed, 2 insertions(+)
21 diff --git a/drivers/video/fbdev/hgafb.c b/drivers/video/fbdev/hgafb.c
22 index 15d3ccff2965..4a397c7c1b56 100644
23 --- a/drivers/video/fbdev/hgafb.c
24 +++ b/drivers/video/fbdev/hgafb.c
25 @@ -285,6 +285,8 @@ static int hga_card_detect(void)
26 hga_vram_len = 0x08000;
28 hga_vram = ioremap(0xb0000, hga_vram_len);
32 if (request_region(0x3b0, 12, "hgafb"))