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drm/mgag200: fix null pointer dereference

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we are referencing the pointer after doing alloc_apertures,
as alloc_apertures kzallocs, the kzalloc may fail and we get a NULL.

so we need to check for NULL before we dereference this pointer

Signed-off-by: Devendra Naga <devendra.aaru@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
Devendra Naga 2012-07-07 09:22:15 +00:00 committed by Dave Airlie
parent f60ec4c7df
commit 4dbdf0aea9
1 changed files with 3 additions and 0 deletions
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drivers/gpu/drm/mgag200/mgag200_drv.c
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@ -47,6 +47,9 @@ static void mgag200_kick_out_firmware_fb(struct pci_dev *pdev)
bool primary = false;
ap = alloc_apertures(1);
if (!ap)
return;
ap->ranges[0].base = pci_resource_start(pdev, 0);
ap->ranges[0].size = pci_resource_len(pdev, 0);