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video: hgafb: fix potential NULL pointer dereference

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[ Upstream commit ec7f6aad57 ]

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@umn.edu>
Cc: Aditya Pakki <pakki001@umn.edu>
Cc: Ferenc Bakonyi <fero@drama.obuda.kando.hu>
[b.zolnierkie: minor patch summary fixup]
Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Kangjie Lu
2019-04-01 17:46:58 +02:00
committed by Greg Kroah-Hartman
parent bea8fa863c
commit 5c7fbc5f6a
1 changed files with 2 additions and 0 deletions
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2
drivers/video/fbdev/hgafb.c
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@@ -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;