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CTRY:US; LANG:en; SCL:1; SRV:; IPV:CAL; SFV:NSPM; H:SATLEXMB04.amd.com; PTR:InfoDomainNonexistent; CAT:NONE; SFS:(13230040)(36860700013)(82310400026)(1800799024)(376014); DIR:OUT; SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 09 Aug 2024 15:03:46.8462 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 42037397-a901-4cff-e3bf-08dcb8847811 X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d; Ip=[165.204.84.17]; Helo=[SATLEXMB04.amd.com] X-MS-Exchange-CrossTenant-AuthSource: CH2PEPF0000013B.namprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: BL3PR12MB6570 X-BeenThere: intel-gfx@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Intel graphics driver community testing & development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" In aperture_remove_conflicting_pci_devices(), match the pci device determine whether or not to call sysfb_disable(). This fixes cases where the pimary device is not VGA compatible which leads to the following problem: 1. A PCI device with a non-VGA class is the the boot display 2. That device is probed first and it is not a vga device so sysfb_disable() is not called, but the device resources are freed by aperture_detach_platform_device() 3. Non-primary GPU is vga device and it ends up calling sysfb_disable() 4. NULL pointer dereference via sysfb_disable() since the resources have already been freed by aperture_detach_platform_device() when it was called by the other device. Fix this by calling sysfb_disable() on the device associated with it. Fixes: 5ae3716cfdcd ("video/aperture: Only remove sysfb on the default vga pci device") Cc: Javier Martinez Canillas Cc: Thomas Zimmermann Cc: Helge Deller Cc: Sam Ravnborg Cc: Daniel Vetter Signed-off-by: Alex Deucher Cc: stable@vger.kernel.org --- drivers/video/aperture.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/drivers/video/aperture.c b/drivers/video/aperture.c index 561be8feca96..56a5a0bc2b1a 100644 --- a/drivers/video/aperture.c +++ b/drivers/video/aperture.c @@ -6,6 +6,7 @@ #include #include #include +#include #include #include #include @@ -346,6 +347,7 @@ EXPORT_SYMBOL(__aperture_remove_legacy_vga_devices); */ int aperture_remove_conflicting_pci_devices(struct pci_dev *pdev, const char *name) { + struct screen_info *si = &screen_info; bool primary = false; resource_size_t base, size; int bar, ret = 0; @@ -353,7 +355,7 @@ int aperture_remove_conflicting_pci_devices(struct pci_dev *pdev, const char *na if (pdev == vga_default_device()) primary = true; - if (primary) + if (pdev == screen_info_pci_dev(si)) sysfb_disable(); for (bar = 0; bar < PCI_STD_NUM_BARS; ++bar) {