5.4-stable review patch. If anyone has any objections, please let me know.
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From: Ivan Abramov i.abramov@mt-integration.ru
[ Upstream commit 9af152dcf1a06f589f44a74da4ad67e365d4db9a ]
Since pci_get_domain_bus_and_slot() can return NULL, add NULL check for pci_gfx_root in the mid_get_vbt_data().
This change is similar to the checks implemented in mid_get_fuse_settings() and mid_get_pci_revID(), which were introduced by commit 0cecdd818cd7 ("gma500: Final enables for Oaktrail") as "additional minor bulletproofing".
Found by Linux Verification Center (linuxtesting.org) with SVACE.
Fixes: f910b411053f ("gma500: Add the glue to the various BIOS and firmware interfaces") Signed-off-by: Ivan Abramov i.abramov@mt-integration.ru Signed-off-by: Patrik Jakobsson patrik.r.jakobsson@gmail.com Link: https://patchwork.freedesktop.org/patch/msgid/20250306112046.17144-1-i.abram... Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/gpu/drm/gma500/mid_bios.c | 5 +++++ 1 file changed, 5 insertions(+)
diff --git a/drivers/gpu/drm/gma500/mid_bios.c b/drivers/gpu/drm/gma500/mid_bios.c index 8ab44fec4bfa4..b76b86278e0e3 100644 --- a/drivers/gpu/drm/gma500/mid_bios.c +++ b/drivers/gpu/drm/gma500/mid_bios.c @@ -277,6 +277,11 @@ static void mid_get_vbt_data(struct drm_psb_private *dev_priv) 0, PCI_DEVFN(2, 0)); int ret = -1;
+ if (pci_gfx_root == NULL) { + WARN_ON(1); + return; + } + /* Get the address of the platform config vbt */ pci_read_config_dword(pci_gfx_root, 0xFC, &addr); pci_dev_put(pci_gfx_root);