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nouveau: Fix crash when pci_ram_rom() returns a size of 0 

From b15b244d6e6e20964bd4b85306722cb60c3c0809 Mon Sep 17 00:00:00 2001
From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Date: Mon, 2 Apr 2012 13:28:18 +1000
Subject:

Under some circumstances, pci_map_rom() can return a valid mapping
but a size of 0 (if it cannot find an image in the header).

This causes nouveau to try to kmalloc() a 0 sized pointer and
dereference it, which crashes.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Acked-by: Ben Skeggs <bskeggs@redhat.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
Benjamin Herrenschmidt 2012-04-02 13:37:13 +10:00 committed by Dave Airlie
parent 40c61046ee
commit ea71f98d68
1 changed files with 3 additions and 2 deletions
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5
drivers/gpu/drm/nouveau/nouveau_bios.c
View File

@ -177,14 +177,15 @@ bios_shadow_pci(struct nvbios *bios)
if (!pci_enable_rom(pdev)) {
void __iomem *rom = pci_map_rom(pdev, &length);
if (rom) {
if (rom && length) {
bios->data = kmalloc(length, GFP_KERNEL);
if (bios->data) {
memcpy_fromio(bios->data, rom, length);
bios->length = length;
}
pci_unmap_rom(pdev, rom);
}
if (rom)
pci_unmap_rom(pdev, rom);
pci_disable_rom(pdev);
}