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Date: Thu, 14 Mar 2019 02:30:27 -0500 From: Kangjie Lu <kjlu@....edu> To: kjlu@....edu Cc: pakki001@....edu, Ferenc Bakonyi <fero@...ma.obuda.kando.hu>, Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>, linux-nvidia@...ts.surfsouth.com, dri-devel@...ts.freedesktop.org, linux-fbdev@...r.kernel.org, linux-kernel@...r.kernel.org Subject: [PATCH] video: hgafb: fix a NULL pointer dereference 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> --- 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; -- 2.17.1
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