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| author | Ivan Abramov <i.abramov@mt-integration.ru> | 2025-03-06 14:20:45 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2025-03-22 12:56:56 -0700 |
| commit | d6c2188e2bceee9b7c9fcec2338a02f8709211ee (patch) | |
| tree | 3e86f4fef8edf2402c947cef4a91118e7f929880 /drivers/gpu | |
| parent | 8e717f12957a9449486355bffaf8541f3da02232 (diff) | |
| download | linux-d6c2188e2bceee9b7c9fcec2338a02f8709211ee.tar.gz linux-d6c2188e2bceee9b7c9fcec2338a02f8709211ee.tar.bz2 linux-d6c2188e2bceee9b7c9fcec2338a02f8709211ee.zip | |
drm/gma500: Add NULL check for pci_gfx_root in mid_get_vbt_data()
[ 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.abramov@mt-integration.ru
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'drivers/gpu')
| -rw-r--r-- | drivers/gpu/drm/gma500/mid_bios.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/gpu/drm/gma500/mid_bios.c b/drivers/gpu/drm/gma500/mid_bios.c index 7e76790c6a81..cba97d7db131 100644 --- a/drivers/gpu/drm/gma500/mid_bios.c +++ b/drivers/gpu/drm/gma500/mid_bios.c @@ -279,6 +279,11 @@ 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); |