linux-kernel - [PATCH 1/2] drm/radeon: have the callers of set_memory

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Message-Id: <20200107192555.20606-2-tli@digitalocean.com>
Date:   Tue,  7 Jan 2020 13:25:54 -0600
From:   Tianlin Li <tli@...italocean.com>
To:     kernel-hardening@...ts.openwall.com, keescook@...omium.org
Cc:     Alex Deucher <alexander.deucher@....com>, christian.koenig@....com,
        David1.Zhou@....com, David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>, amd-gfx@...ts.freedesktop.org,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        Tianlin Li <tli@...italocean.com>
Subject: [PATCH 1/2] drm/radeon: have the callers of set_memory_*() check the return value

Have the callers of set_memory_*() in drm/radeon check the return value.
Change the return type of the callers properly. 

Signed-off-by: Tianlin Li <tli@...italocean.com>
---
 drivers/gpu/drm/radeon/radeon.h      |  2 +-
 drivers/gpu/drm/radeon/radeon_gart.c | 22 ++++++++++++++++++----
 2 files changed, 19 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/radeon/radeon.h b/drivers/gpu/drm/radeon/radeon.h
index 30e32adc1fc6..a23e58397293 100644
--- a/drivers/gpu/drm/radeon/radeon.h
+++ b/drivers/gpu/drm/radeon/radeon.h
@@ -661,7 +661,7 @@ struct radeon_gart {
 };
 
 int radeon_gart_table_ram_alloc(struct radeon_device *rdev);
-void radeon_gart_table_ram_free(struct radeon_device *rdev);
+int radeon_gart_table_ram_free(struct radeon_device *rdev);
 int radeon_gart_table_vram_alloc(struct radeon_device *rdev);
 void radeon_gart_table_vram_free(struct radeon_device *rdev);
 int radeon_gart_table_vram_pin(struct radeon_device *rdev);
diff --git a/drivers/gpu/drm/radeon/radeon_gart.c b/drivers/gpu/drm/radeon/radeon_gart.c
index d4d3778d0a98..59039ab602e8 100644
--- a/drivers/gpu/drm/radeon/radeon_gart.c
+++ b/drivers/gpu/drm/radeon/radeon_gart.c
@@ -71,6 +71,7 @@
 int radeon_gart_table_ram_alloc(struct radeon_device *rdev)
 {
 	void *ptr;
+	int ret;
 
 	ptr = pci_alloc_consistent(rdev->pdev, rdev->gart.table_size,
 				   &rdev->gart.table_addr);
@@ -80,8 +81,16 @@ int radeon_gart_table_ram_alloc(struct radeon_device *rdev)
 #ifdef CONFIG_X86
 	if (rdev->family == CHIP_RS400 || rdev->family == CHIP_RS480 ||
 	    rdev->family == CHIP_RS690 || rdev->family == CHIP_RS740) {
-		set_memory_uc((unsigned long)ptr,
+		ret = set_memory_uc((unsigned long)ptr,
 			      rdev->gart.table_size >> PAGE_SHIFT);
+		if (ret) {
+			pci_free_consistent(rdev->pdev, rdev->gart.table_size,
+						(void *)rdev->gart.ptr,
+						rdev->gart.table_addr);
+			rdev->gart.ptr = NULL;
+			rdev->gart.table_addr = 0;
+			return ret;
+		}
 	}
 #endif
 	rdev->gart.ptr = ptr;
@@ -98,16 +107,20 @@ int radeon_gart_table_ram_alloc(struct radeon_device *rdev)
  * (r1xx-r3xx, non-pcie r4xx, rs400).  These asics require the
  * gart table to be in system memory.
  */
-void radeon_gart_table_ram_free(struct radeon_device *rdev)
+int radeon_gart_table_ram_free(struct radeon_device *rdev)
 {
+	int ret;
+
 	if (rdev->gart.ptr == NULL) {
-		return;
+		return 0;
 	}
 #ifdef CONFIG_X86
 	if (rdev->family == CHIP_RS400 || rdev->family == CHIP_RS480 ||
 	    rdev->family == CHIP_RS690 || rdev->family == CHIP_RS740) {
-		set_memory_wb((unsigned long)rdev->gart.ptr,
+		ret = set_memory_wb((unsigned long)rdev->gart.ptr,
 			      rdev->gart.table_size >> PAGE_SHIFT);
+		if (ret)
+			return ret;
 	}
 #endif
 	pci_free_consistent(rdev->pdev, rdev->gart.table_size,
@@ -115,6 +128,7 @@ void radeon_gart_table_ram_free(struct radeon_device *rdev)
 			    rdev->gart.table_addr);
 	rdev->gart.ptr = NULL;
 	rdev->gart.table_addr = 0;
+	return 0;
 }
 
 /**
-- 
2.17.1