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From: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
To: gregkh@linuxfoundation.org
Cc: arnd@arndb.de, linux-arm-msm@vger.kernel.org,
	linux-kernel@vger.kernel.org,
	Srinivas Kandagatla <srinivas.kandagatla@linaro.org>,
	Mayank Chopra <mak.chopra@codeaurora.org>
Subject: [PATCH 5/5] misc: fastrpc: free dma buf scatter list
Date: Fri, 23 Aug 2019 11:06:22 +0100
Message-ID: <20190823100622.3892-6-srinivas.kandagatla@linaro.org> (raw)
In-Reply-To: <20190823100622.3892-1-srinivas.kandagatla@linaro.org>

dma buf scatter list is never freed, free it!

Orignally detected by kmemleak:
  backtrace:
    [<ffffff80088b7658>] kmemleak_alloc+0x50/0x84
    [<ffffff8008373284>] sg_kmalloc+0x38/0x60
    [<ffffff8008373144>] __sg_alloc_table+0x60/0x110
    [<ffffff800837321c>] sg_alloc_table+0x28/0x58
    [<ffffff800837336c>] __sg_alloc_table_from_pages+0xc0/0x1ac
    [<ffffff800837346c>] sg_alloc_table_from_pages+0x14/0x1c
    [<ffffff8008097a3c>] __iommu_get_sgtable+0x5c/0x8c
    [<ffffff800850a1d0>] fastrpc_dma_buf_attach+0x84/0xf8
    [<ffffff80085114bc>] dma_buf_attach+0x70/0xc8
    [<ffffff8008509efc>] fastrpc_map_create+0xf8/0x1e8
    [<ffffff80085086f4>] fastrpc_device_ioctl+0x508/0x900
    [<ffffff80082428c8>] compat_SyS_ioctl+0x128/0x200
    [<ffffff80080832c4>] el0_svc_naked+0x34/0x38
    [<ffffffffffffffff>] 0xffffffffffffffff

Reported-by: Mayank Chopra <mak.chopra@codeaurora.org>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
---
 drivers/misc/fastrpc.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/misc/fastrpc.c b/drivers/misc/fastrpc.c
index eee2bb398947..47ae84afac2e 100644
--- a/drivers/misc/fastrpc.c
+++ b/drivers/misc/fastrpc.c
@@ -550,6 +550,7 @@ static void fastrpc_dma_buf_detatch(struct dma_buf *dmabuf,
 	mutex_lock(&buffer->lock);
 	list_del(&a->node);
 	mutex_unlock(&buffer->lock);
+	sg_free_table(&a->sgt);
 	kfree(a);
 }
 
-- 
2.21.0


      parent reply index

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-08-23 10:06 [PATCH 0/5] misc: fastrpc: few fixes Srinivas Kandagatla
2019-08-23 10:06 ` [PATCH 1/5] misc: fastrpc: Reference count channel context Srinivas Kandagatla
2019-08-28 20:53   ` Greg KH
2019-08-23 10:06 ` [PATCH 2/5] misc: fastrpc: Don't reference rpmsg_device after remove Srinivas Kandagatla
2019-08-28 15:41   ` Stephen Boyd
2019-08-23 10:06 ` [PATCH 3/5] misc: fastrpc: remove unused definition Srinivas Kandagatla
2019-08-23 10:06 ` [PATCH 4/5] misc: fastrpc: fix double refcounting on dmabuf Srinivas Kandagatla
     [not found]   ` <CAC8LzUAnz+RZYh+bBbJbXJYP3QDq4H1847W8rJxj-aF1B1J9QQ@mail.gmail.com>
2019-08-27 21:45     ` Srinivas Kandagatla
2019-08-28  7:50       ` Jorge Ramirez
2019-08-28  8:48         ` Srinivas Kandagatla
2019-08-28 10:35           ` Jorge Ramirez
2019-08-23 10:06 ` Srinivas Kandagatla [this message]

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