linux-kernel - [PATCH AUTOSEL for 4.15 08/78] drm/msm: fix leak in failed get

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Date:   Thu, 8 Mar 2018 04:56:04 +0000
From:   Sasha Levin <Alexander.Levin@...rosoft.com>
To:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>
CC:     Prakash Kamliya <pkamliya@...eaurora.org>,
        Sharat Masetty <smasetty@...eaurora.org>,
        Rob Clark <robdclark@...il.com>,
        Sasha Levin <Alexander.Levin@...rosoft.com>
Subject: [PATCH AUTOSEL for 4.15 08/78] drm/msm: fix leak in failed get_pages

From: Prakash Kamliya <pkamliya@...eaurora.org>

[ Upstream commit 62e3a3e342af3c313ab38603811ecdb1fcc79edb ]

get_pages doesn't keep a reference of the pages allocated
when it fails later in the code path. This can lead to
a memory leak. Keep reference of the allocated pages so
that it can be freed when msm_gem_free_object gets called
later during cleanup.

Signed-off-by: Prakash Kamliya <pkamliya@...eaurora.org>
Signed-off-by: Sharat Masetty <smasetty@...eaurora.org>
Signed-off-by: Rob Clark <robdclark@...il.com>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
---
 drivers/gpu/drm/msm/msm_gem.c | 14 ++++++++++----
 1 file changed, 10 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/msm/msm_gem.c b/drivers/gpu/drm/msm/msm_gem.c
index 81fe6d6740ce..07376de9ff4c 100644
--- a/drivers/gpu/drm/msm/msm_gem.c
+++ b/drivers/gpu/drm/msm/msm_gem.c
@@ -93,14 +93,17 @@ static struct page **get_pages(struct drm_gem_object *obj)
 			return p;
 		}
 
+		msm_obj->pages = p;
+
 		msm_obj->sgt = drm_prime_pages_to_sg(p, npages);
 		if (IS_ERR(msm_obj->sgt)) {
+			void *ptr = ERR_CAST(msm_obj->sgt);
+
 			dev_err(dev->dev, "failed to allocate sgt\n");
-			return ERR_CAST(msm_obj->sgt);
+			msm_obj->sgt = NULL;
+			return ptr;
 		}
 
-		msm_obj->pages = p;
-
 		/* For non-cached buffers, ensure the new pages are clean
 		 * because display controller, GPU, etc. are not coherent:
 		 */
@@ -135,7 +138,10 @@ static void put_pages(struct drm_gem_object *obj)
 		if (msm_obj->flags & (MSM_BO_WC|MSM_BO_UNCACHED))
 			dma_unmap_sg(obj->dev->dev, msm_obj->sgt->sgl,
 					msm_obj->sgt->nents, DMA_BIDIRECTIONAL);
-		sg_free_table(msm_obj->sgt);
+
+		if (msm_obj->sgt)
+			sg_free_table(msm_obj->sgt);
+
 		kfree(msm_obj->sgt);
 
 		if (use_pages(obj))
-- 
2.14.1