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Commit 1f2611af authored by Kangjie Lu's avatar Kangjie Lu Committed by Greg Kroah-Hartman
Browse files

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: default avatarKangjie 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: default avatarBartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Signed-off-by: default avatarSasha Levin <sashal@kernel.org>
parent 5957f6f5

drivers/video/fbdev/hgafb.c

+2 −0
Original line number Diff line number Diff line
@@ -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;