[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@umn.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;