linux-kernel - [PATCH 5/5] gpu: drm: amdgpu: Replace snprintf() with sysfs

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Date:   Thu, 22 Oct 2020 19:19:42 +0530
From:   Sumera Priyadarsini <sylphrenadin@...il.com>
To:     dri-devel@...ts.freedesktop.org
Cc:     outreachy-kernel@...glegroups.com, alexander.deucher@....com,
        christian.koenig@....com, airlied@...ux.ie, daniel@...ll.ch,
        melissa.srw@...il.com, linux-media@...r.kernel.org,
        amd-gfx@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: [PATCH 5/5] gpu: drm: amdgpu: Replace snprintf() with sysfs_emit()

Using snprintf() for show() methods holds the risk of buffer overrun
as snprintf() does not know the PAGE_SIZE maximum of the temporary
buffer used to output sysfs content.

Modify amdgpu_ras.c to use sysfs_emit() instead which knows the
size of the temporary buffer.

Issue found with Coccinelle.

Signed-off-by: Sumera Priyadarsini <sylphrenadin@...il.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c
index e5ea14774c0c..6d9901e1b4b0 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c
@@ -429,13 +429,13 @@ static ssize_t amdgpu_ras_sysfs_read(struct device *dev,
 	};
 
 	if (!amdgpu_ras_get_error_query_ready(obj->adev))
-		return snprintf(buf, PAGE_SIZE,
+		return sysfs_emit(buf, PAGE_SIZE,
 				"Query currently inaccessible\n");
 
 	if (amdgpu_ras_error_query(obj->adev, &info))
 		return -EINVAL;
 
-	return snprintf(buf, PAGE_SIZE, "%s: %lu\n%s: %lu\n",
+	return sysfs_emit(buf, PAGE_SIZE, "%s: %lu\n%s: %lu\n",
 			"ue", info.ue_count,
 			"ce", info.ce_count);
 }
-- 
2.25.1