[coreboot-gerrit] Change in coreboot[master]: libpayload: corebootfb: Add null check for framebuffer address

[Duncan Laurie (Code Review)]

Duncan Laurie has uploaded this change for review. ( https://review.coreboot.org/20368

Change subject: libpayload: corebootfb: Add null check for framebuffer address
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libpayload: corebootfb: Add null check for framebuffer address

If the framebuffer address is zero the corebootfb_init() function
should abort and not attempt to use it for video, otherwise it
will likely hang.

This was tested by booting on a board that does not have a display
attached and includes the previous patch to zero the framebuffer
structure in the coreboot tables.

Change-Id: I53ca2e947a7915cebb31b51e11ac6c310d9d6c55
Signed-off-by: Duncan Laurie 
---
M payloads/libpayload/drivers/video/corebootfb.c
1 file changed, 2 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/68/20368/1

diff --git a/payloads/libpayload/drivers/video/corebootfb.c b/payloads/libpayload/drivers/video/corebootfb.c
index 46f891f..1aeac12 100644
--- a/payloads/libpayload/drivers/video/corebootfb.c
+++ b/payloads/libpayload/drivers/video/corebootfb.c
@@ -237,6 +237,8 @@
    fbinfo = virt_to_phys(lib_sysinfo.framebuffer);

fbaddr = FI->physical_address;
+	if (fbaddr == 0)
+		return -1;

coreboot_video_console.columns = FI->x_resolution / FONT_WIDTH;
    coreboot_video_console.rows = FI->y_resolution / FONT_HEIGHT;