From 81de29d842ccb776c0f77aa3e2b11b07fff0c0e2 Mon Sep 17 00:00:00 2001
From: Allen Pais <allen.pais@oracle.com>
Date: Wed, 18 Sep 2019 22:00:31 +0530
Subject: drm/amdkfd: fix a potential NULL pointer dereference (v2)
Git-commit: 81de29d842ccb776c0f77aa3e2b11b07fff0c0e2
Patch-mainline: v5.5-rc1
References: bsc#1152489 bsc#1150468 CVE-2019-16230
alloc_workqueue is not checked for errors and as a result,
a potential NULL dereference could occur.
v2 (Felix Kuehling):
* Fix compile error (kfifo_free instead of fifo_free)
* Return proper error code
Signed-off-by: Allen Pais <allen.pais@oracle.com>
Reviewed-by: Felix Kuehling <Felix.Kuehling@amd.com>
Signed-off-by: Felix Kuehling <Felix.Kuehling@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Acked-by: Thomas Zimmermann <tzimmermann@suse.de>
---
drivers/gpu/drm/amd/amdkfd/kfd_interrupt.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_interrupt.c b/drivers/gpu/drm/amd/amdkfd/kfd_interrupt.c
index c56ac47cd318..bc47f6a44456 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_interrupt.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_interrupt.c
@@ -62,6 +62,11 @@ int kfd_interrupt_init(struct kfd_dev *kfd)
}
kfd->ih_wq = alloc_workqueue("KFD IH", WQ_HIGHPRI, 1);
+ if (unlikely(!kfd->ih_wq)) {
+ kfifo_free(&kfd->ih_fifo);
+ dev_err(kfd_chardev(), "Failed to allocate KFD IH workqueue\n");
+ return -ENOMEM;
+ }
spin_lock_init(&kfd->interrupt_lock);
INIT_WORK(&kfd->interrupt_work, interrupt_wq);
--
2.28.0