diff options
| author | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2012-04-02 13:37:13 +1000 |
|---|---|---|
| committer | Dave Airlie <airlied@redhat.com> | 2012-04-02 11:05:58 +0100 |
| commit | ea71f98d680c9ac768a7849d26d7ce4744064510 (patch) | |
| tree | 696b8eb9fc6541f71caede709857de3f07d08f06 /drivers/gpu | |
| parent | 40c61046ee3007d73f141e96aa2f3dd56ee321c6 (diff) | |
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>
Diffstat (limited to 'drivers/gpu')
| -rw-r--r-- | drivers/gpu/drm/nouveau/nouveau_bios.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/drivers/gpu/drm/nouveau/nouveau_bios.c b/drivers/gpu/drm/nouveau/nouveau_bios.c index 637afe71de5..80963d05b54 100644 --- a/drivers/gpu/drm/nouveau/nouveau_bios.c +++ b/drivers/gpu/drm/nouveau/nouveau_bios.c @@ -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); } |