linux-kernel - [PATCH 4.9 046/117] video: hgafb: fix potential NULL pointer dereference

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Message-Id: <20190620174354.722730893@linuxfoundation.org>
Date:   Thu, 20 Jun 2019 19:56:20 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Kangjie Lu <kjlu@....edu>,
        Aditya Pakki <pakki001@....edu>,
        Ferenc Bakonyi <fero@...ma.obuda.kando.hu>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.9 046/117] video: hgafb: fix potential NULL pointer dereference

[ Upstream commit ec7f6aad57ad29e4e66cc2e18e1e1599ddb02542 ]

When ioremap fails, hga_vram should not be dereferenced. The fix
check the failure to avoid NULL pointer dereference.

Signed-off-by: Kangjie Lu <kjlu@....edu>
Cc: Aditya Pakki <pakki001@....edu>
Cc: Ferenc Bakonyi <fero@...ma.obuda.kando.hu>
[b.zolnierkie: minor patch summary fixup]
Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/video/fbdev/hgafb.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/video/fbdev/hgafb.c b/drivers/video/fbdev/hgafb.c
index 463028543173..59e1cae57948 100644
--- a/drivers/video/fbdev/hgafb.c
+++ b/drivers/video/fbdev/hgafb.c
@@ -285,6 +285,8 @@ static int hga_card_detect(void)
 	hga_vram_len  = 0x08000;
 
 	hga_vram = ioremap(0xb0000, hga_vram_len);
+	if (!hga_vram)
+		goto error;
 
 	if (request_region(0x3b0, 12, "hgafb"))
 		release_io_ports = 1;
-- 
2.20.1