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From: YueHaibing <yuehaibing@huawei.com>
To: <maarten.lankhorst@linux.intel.com>, <maxime.ripard@bootlin.com>,
	<sean@poorly.run>, <airlied@linux.ie>, <daniel@ffwll.ch>
Cc: <linux-kernel@vger.kernel.org>, <dri-devel@lists.freedesktop.org>,
	YueHaibing <yuehaibing@huawei.com>
Subject: [PATCH -next] drm: Fix error handling in drm_legacy_addctx
Date: Sat, 29 Dec 2018 10:49:07 +0800	[thread overview]
Message-ID: <20181229024907.12852-1-yuehaibing@huawei.com> (raw)

'ctx->handle' is unsigned, it never less than zero.
This patch use int 'tmp_handle' to handle the err condition.

Fixes: 62968144e673 ("drm: convert drm context code to use Linux idr")
Signed-off-by: YueHaibing <yuehaibing@huawei.com>
---
 drivers/gpu/drm/drm_context.c | 15 +++++++++------
 1 file changed, 9 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/drm_context.c b/drivers/gpu/drm/drm_context.c
index 506663c..8e73fab 100644
--- a/drivers/gpu/drm/drm_context.c
+++ b/drivers/gpu/drm/drm_context.c
@@ -361,23 +361,26 @@ int drm_legacy_addctx(struct drm_device *dev, void *data,
 {
 	struct drm_ctx_list *ctx_entry;
 	struct drm_ctx *ctx = data;
+	int tmp_handle;
 
 	if (!drm_core_check_feature(dev, DRIVER_KMS_LEGACY_CONTEXT) &&
 	    !drm_core_check_feature(dev, DRIVER_LEGACY))
 		return -EOPNOTSUPP;
 
-	ctx->handle = drm_legacy_ctxbitmap_next(dev);
-	if (ctx->handle == DRM_KERNEL_CONTEXT) {
+	tmp_handle = drm_legacy_ctxbitmap_next(dev);
+	if (tmp_handle == DRM_KERNEL_CONTEXT) {
 		/* Skip kernel's context and get a new one. */
-		ctx->handle = drm_legacy_ctxbitmap_next(dev);
+		tmp_handle = drm_legacy_ctxbitmap_next(dev);
 	}
-	DRM_DEBUG("%d\n", ctx->handle);
-	if (ctx->handle < 0) {
+	DRM_DEBUG("%d\n", tmp_handle);
+	if (tmp_handle < 0) {
 		DRM_DEBUG("Not enough free contexts.\n");
 		/* Should this return -EBUSY instead? */
-		return -ENOMEM;
+		return tmp_handle;
 	}
 
+	ctx->handle = tmp_handle;
+
 	ctx_entry = kmalloc(sizeof(*ctx_entry), GFP_KERNEL);
 	if (!ctx_entry) {
 		DRM_DEBUG("out of memory\n");
-- 
2.7.0



WARNING: multiple messages have this Message-ID (diff)
From: YueHaibing <yuehaibing@huawei.com>
To: maarten.lankhorst@linux.intel.com, maxime.ripard@bootlin.com,
	sean@poorly.run, airlied@linux.ie, daniel@ffwll.ch
Cc: linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org,
	YueHaibing <yuehaibing@huawei.com>
Subject: [PATCH -next] drm: Fix error handling in drm_legacy_addctx
Date: Sat, 29 Dec 2018 10:49:07 +0800	[thread overview]
Message-ID: <20181229024907.12852-1-yuehaibing@huawei.com> (raw)

'ctx->handle' is unsigned, it never less than zero.
This patch use int 'tmp_handle' to handle the err condition.

Fixes: 62968144e673 ("drm: convert drm context code to use Linux idr")
Signed-off-by: YueHaibing <yuehaibing@huawei.com>
---
 drivers/gpu/drm/drm_context.c | 15 +++++++++------
 1 file changed, 9 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/drm_context.c b/drivers/gpu/drm/drm_context.c
index 506663c..8e73fab 100644
--- a/drivers/gpu/drm/drm_context.c
+++ b/drivers/gpu/drm/drm_context.c
@@ -361,23 +361,26 @@ int drm_legacy_addctx(struct drm_device *dev, void *data,
 {
 	struct drm_ctx_list *ctx_entry;
 	struct drm_ctx *ctx = data;
+	int tmp_handle;
 
 	if (!drm_core_check_feature(dev, DRIVER_KMS_LEGACY_CONTEXT) &&
 	    !drm_core_check_feature(dev, DRIVER_LEGACY))
 		return -EOPNOTSUPP;
 
-	ctx->handle = drm_legacy_ctxbitmap_next(dev);
-	if (ctx->handle == DRM_KERNEL_CONTEXT) {
+	tmp_handle = drm_legacy_ctxbitmap_next(dev);
+	if (tmp_handle == DRM_KERNEL_CONTEXT) {
 		/* Skip kernel's context and get a new one. */
-		ctx->handle = drm_legacy_ctxbitmap_next(dev);
+		tmp_handle = drm_legacy_ctxbitmap_next(dev);
 	}
-	DRM_DEBUG("%d\n", ctx->handle);
-	if (ctx->handle < 0) {
+	DRM_DEBUG("%d\n", tmp_handle);
+	if (tmp_handle < 0) {
 		DRM_DEBUG("Not enough free contexts.\n");
 		/* Should this return -EBUSY instead? */
-		return -ENOMEM;
+		return tmp_handle;
 	}
 
+	ctx->handle = tmp_handle;
+
 	ctx_entry = kmalloc(sizeof(*ctx_entry), GFP_KERNEL);
 	if (!ctx_entry) {
 		DRM_DEBUG("out of memory\n");
-- 
2.7.0

             reply	other threads:[~2018-12-29  2:50 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-12-29  2:49 YueHaibing [this message]
2018-12-29  2:49 ` [PATCH -next] drm: Fix error handling in drm_legacy_addctx YueHaibing
2019-01-07 10:26 ` Daniel Vetter

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