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From: Dan Carpenter <dan.carpenter@oracle.com>
To: Jani Nikula <jani.nikula@linux.intel.com>
Cc: David Airlie <airlied@linux.ie>,
	intel-gfx@lists.freedesktop.org, kernel-janitors@vger.kernel.org,
	"Gustavo A. R. Silva" <gustavoars@kernel.org>,
	Chris Wilson <chris@chris-wilson.co.uk>,
	Matthew Auld <matthew.auld@intel.com>,
	Wambui Karuga <wambui.karugax@gmail.com>
Subject: [Intel-gfx] [PATCH] drm/i915/gem: Fix oops in error handling code
Date: Mon, 25 Jan 2021 11:47:12 +0300	[thread overview]
Message-ID: <YA6FkPn5S4ZDUGxq@mwanda> (raw)

This code will Oops when it tries to i915_gem_object_free(obj) because
"obj" is an error pointer.

Fixes: 97d553963250 ("drm/i915/region: convert object_create into object_init")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
---
 drivers/gpu/drm/i915/gem/i915_gem_stolen.c | 12 ++++--------
 1 file changed, 4 insertions(+), 8 deletions(-)

diff --git a/drivers/gpu/drm/i915/gem/i915_gem_stolen.c b/drivers/gpu/drm/i915/gem/i915_gem_stolen.c
index 551935348ad8..a1e197a6e999 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_stolen.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_stolen.c
@@ -753,22 +753,18 @@ i915_gem_object_create_stolen_for_preallocated(struct drm_i915_private *i915,
 	mutex_lock(&i915->mm.stolen_lock);
 	ret = drm_mm_reserve_node(&i915->mm.stolen, stolen);
 	mutex_unlock(&i915->mm.stolen_lock);
-	if (ret) {
-		obj = ERR_PTR(ret);
+	if (ret)
 		goto err_free;
-	}
 
 	obj = i915_gem_object_alloc();
 	if (!obj) {
-		obj = ERR_PTR(-ENOMEM);
+		ret = -ENOMEM;
 		goto err_stolen;
 	}
 
 	ret = __i915_gem_object_create_stolen(mem, obj, stolen);
-	if (ret) {
-		obj = ERR_PTR(ret);
+	if (ret)
 		goto err_object_free;
-	}
 
 	i915_gem_object_set_cache_coherency(obj, I915_CACHE_NONE);
 	return obj;
@@ -779,7 +775,7 @@ i915_gem_object_create_stolen_for_preallocated(struct drm_i915_private *i915,
 	i915_gem_stolen_remove_node(i915, stolen);
 err_free:
 	kfree(stolen);
-	return obj;
+	return ERR_PTR(ret);
 }
 
 bool i915_gem_object_is_stolen(const struct drm_i915_gem_object *obj)
-- 
2.29.2

_______________________________________________
Intel-gfx mailing list
Intel-gfx@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/intel-gfx

WARNING: multiple messages have this Message-ID (diff)
From: Dan Carpenter <dan.carpenter@oracle.com>
To: Jani Nikula <jani.nikula@linux.intel.com>
Cc: David Airlie <airlied@linux.ie>,
	intel-gfx@lists.freedesktop.org, kernel-janitors@vger.kernel.org,
	"Gustavo A. R. Silva" <gustavoars@kernel.org>,
	Chris Wilson <chris@chris-wilson.co.uk>,
	Matthew Auld <matthew.auld@intel.com>,
	Wambui Karuga <wambui.karugax@gmail.com>
Subject: [PATCH] drm/i915/gem: Fix oops in error handling code
Date: Mon, 25 Jan 2021 08:47:12 +0000	[thread overview]
Message-ID: <YA6FkPn5S4ZDUGxq@mwanda> (raw)

This code will Oops when it tries to i915_gem_object_free(obj) because
"obj" is an error pointer.

Fixes: 97d553963250 ("drm/i915/region: convert object_create into object_init")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
---
 drivers/gpu/drm/i915/gem/i915_gem_stolen.c | 12 ++++--------
 1 file changed, 4 insertions(+), 8 deletions(-)

diff --git a/drivers/gpu/drm/i915/gem/i915_gem_stolen.c b/drivers/gpu/drm/i915/gem/i915_gem_stolen.c
index 551935348ad8..a1e197a6e999 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_stolen.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_stolen.c
@@ -753,22 +753,18 @@ i915_gem_object_create_stolen_for_preallocated(struct drm_i915_private *i915,
 	mutex_lock(&i915->mm.stolen_lock);
 	ret = drm_mm_reserve_node(&i915->mm.stolen, stolen);
 	mutex_unlock(&i915->mm.stolen_lock);
-	if (ret) {
-		obj = ERR_PTR(ret);
+	if (ret)
 		goto err_free;
-	}
 
 	obj = i915_gem_object_alloc();
 	if (!obj) {
-		obj = ERR_PTR(-ENOMEM);
+		ret = -ENOMEM;
 		goto err_stolen;
 	}
 
 	ret = __i915_gem_object_create_stolen(mem, obj, stolen);
-	if (ret) {
-		obj = ERR_PTR(ret);
+	if (ret)
 		goto err_object_free;
-	}
 
 	i915_gem_object_set_cache_coherency(obj, I915_CACHE_NONE);
 	return obj;
@@ -779,7 +775,7 @@ i915_gem_object_create_stolen_for_preallocated(struct drm_i915_private *i915,
 	i915_gem_stolen_remove_node(i915, stolen);
 err_free:
 	kfree(stolen);
-	return obj;
+	return ERR_PTR(ret);
 }
 
 bool i915_gem_object_is_stolen(const struct drm_i915_gem_object *obj)
-- 
2.29.2

             reply	other threads:[~2021-01-25 12:49 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-01-25  8:47 Dan Carpenter [this message]
2021-01-25  8:47 ` [PATCH] drm/i915/gem: Fix oops in error handling code Dan Carpenter
2021-01-25  9:41 ` [Intel-gfx] " Chris Wilson
2021-01-25 13:09 ` [Intel-gfx] ✗ Fi.CI.BAT: failure for " Patchwork

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